Fact-checked by Grok 2 weeks ago

Master Lock


Master Lock Company, LLC is an American manufacturer of , combination locks, safes, and security products, founded in 1921 by locksmith and inventor Harry Soref in , . The company gained prominence through Soref's 1924 for the laminated steel , an innovation that enhanced durability by layering steel plates around the lock's core, setting a standard for weather-resistant security. By the mid-20th century, Master Lock had become the largest padlock producer in the United States, bolstered by its acquisition in 1970 by American Brands (later Fortune Brands Innovations, Inc.), under which it expanded globally and diversified its product line to include resettable combination locks introduced in 1982, TSA-approved travel locks in 2004, and Bluetooth-enabled smart padlocks in 2015. Iconic advertising campaigns, starting with the 1974 Super Bowl "shot lock" commercial demonstrating product resilience, reinforced its reputation for toughness with the tagline "Tough Under Fire." In recent years, Master Lock has acquired brands like Yale and August in 2023 while facing operational shifts, including the 2024 closure of its century-old Milwaukee manufacturing plant and the 2025 relocation of its Oak Creek headquarters to Deerfield, Illinois, as part of parent company consolidations.

History

Founding and Early Innovations (1921–1940s)

Master Lock Company was incorporated in 1921 in , , by locksmith and inventor Harry Soref, along with partners P.E. Yolles and Samuel Stahl. Soref, a Jewish immigrant born in 1887, drew inspiration from hardened steel used in military equipment and construction to address the limitations of existing padlocks, which were either prohibitively expensive for high security or easily compromised when inexpensive. The company commenced operations in a modest one-room workshop, initially producing padlocks with a focus on durability through innovative assembly methods, including a system where materials were brought to stationary assemblers to ensure consistent quality. A pivotal early was Soref's laminated , designed around 1919 and patented on April 22, 1924 (U.S. Patent 1,490,987), which featured a body formed by riveting multiple layers of plates together for enhanced resistance to , cutting, and prying—mimicking vault-like strength at roughly one-tenth the cost of premium alternatives. This filled a critical market gap, as prior lacked affordable robustness, and it became the foundation of Master Lock's reputation for reliability. The company's early growth accelerated with a 1928 federal order for 147,600 padlocks valued at $65,000 to secure Prohibition-era shipments from to . In 1931, Soref received a from the American Association of Master Locksmiths for the padlock's status as the most significant lock advancement in over 50 years. Demonstrations of its durability, such as at the 1933 World's Fair exhibit highlighting the laminated construction, further solidified public trust. By 1935, Master Lock introduced its first combination padlock, expanding product offerings, and relocated to a larger facility in 1939 amid rising demand. During the early 1940s, production pivoted to support efforts, with Soref serving as a security consultant.

Post-War Expansion and Mid-Century Growth (1950s–1990s)

Following , Master Lock benefited from the postwar economic boom and rising demand for consumer security products, such as for suburban homes and school lockers, leading to steady expansion in production capacity at its facility. By the mid-1950s, the company had solidified its position as a leading U.S. manufacturer, with operations continuing under founder Harry Soref until his death in 1957, after which Sam Stahl assumed leadership until 1964. The firm introduced enhancements to its laminated steel and diversified into related security items, capitalizing on the era's industrial and residential growth without major disruptions. In the 1970s, Master Lock experienced accelerated , marked by its acquisition by in 1970, which provided capital for further development and expanded its workforce to approximately 1,050 employees by that year. A landmark 1974 advertisement featuring a failing to shoot through a ("shot lock" campaign) significantly boosted brand visibility and . By , the company reported its 13th consecutive year of , with reaching $62.4 million and operating of $22.7 million; the following year, it initiated a major facility , adding a 92,000-square-foot warehouse and production space. Product innovations included locks in 1979, targeting emerging personal mobility trends. The 1980s represented the pinnacle of Master Lock's mid-century expansion, with employment peaking at 1,300 workers in by the mid-decade, operating three shifts to produce tens of millions of padlocks annually and capturing 60% of the domestic market. In 1981, it launched padlocks designed for environments, broadening its industrial applications. The 1986 acquisition of Lock Company added $25 million in annual revenue, complemented by a $25 million investment in equipment upgrades to enhance efficiency. Continued advertisements in this period reinforced the brand's reputation for durability, contributing to sustained market dominance. Entering the 1990s, Master Lock achieved a of 70% by 1994, but faced intensifying pricing pressures from foreign competitors, prompting initial shifts toward overseas manufacturing and offices in and . These challenges marked the beginning of , including plans to move 700 assembly jobs to by 1997, even as domestic operations remained robust through the decade's early years. The company's plant, a of local employment since the postwar era, exemplified its growth trajectory while highlighting vulnerabilities to global competition.

21st-Century Ownership Changes and Challenges

In 2011, , Inc., which had owned Master Lock since acquiring it in 1970 through its predecessor , restructured by spinning off its home and security business—including Master Lock—into a separate publicly traded entity called , Inc. This , completed on October 3, 2011, allowed the new company to focus exclusively on security and home products, while the parent shifted toward beverages and . The entity later rebranded as in 2022 to reflect expanded innovation in connected home products. Despite this structural change providing operational independence, Master Lock faced significant manufacturing challenges in the , driven by global competition and rising costs. In June 2023, the company announced the closure of its historic Milwaukee production facility—its original site since 1921—eliminating over 400 jobs by March 2024, as production shifted to lower-cost international suppliers. This move marked the end of domestic manufacturing after a century, amid pressures from trends accelerated by trade agreements like , which critics argue eroded U.S. industrial bases by favoring cheaper foreign labor. Further consolidation followed in January 2025, when Fortune Brands Innovations disclosed the shuttering of Master Lock's Oak Creek, Wisconsin, world headquarters, impacting approximately 120 administrative roles and relocating operations to Deerfield, Illinois. These decisions, justified by the parent company as supply chain efficiencies, highlighted vulnerabilities in maintaining U.S.-centric operations against Asian competitors offering comparable products at reduced prices due to labor and regulatory differences. Local officials and unions decried the losses as detrimental to Milwaukee's blue-collar economy, once bolstered by over 50 nearby factories now largely vanished. No major ownership sales or acquisitions altered Master Lock's corporate control during this period, underscoring that internal strategic shifts, rather than external takeovers, drove the adaptations.

Products and Core Offerings

Keyed Padlocks

Master Lock produces a range of keyed padlocks, which are mechanical devices secured and released by inserting and turning a metal key into a cylinder lock mechanism, distinguishing them from combination or electronic variants. These padlocks feature bodies constructed from materials such as laminated steel, solid brass, stainless steel, or aluminum to balance strength, corrosion resistance, and weight for diverse applications including outdoor storage, gates, and industrial use. The product line includes standard models like the No. 1 keyed different laminated , with a 1-3/4 inch reinforced body designed for extra strength against prying and cutting attempts. Higher-end ProSeries padlocks offer enhanced through features such as hardened bodies, multi-pin cylinders with up to 10 pins for pick resistance, dual ball bearings to prevent removal, and anti-shim to counter shim attacks. Available styles encompass Weather Tough for extreme environments, Iron Shroud for added protection, and variants in or aluminum for lighter-duty needs. Keying options facilitate management of multiple locks: keyed alike allows a single key to operate several padlocks, while master-keyed systems enable individual keys for daily use alongside a master key for supervisory access, with Master Lock maintaining records for such configurations. models, such as the 3SSQ, suit marine or saltwater applications due to their durability and resistance to . These padlocks incorporate 4-pin or advanced tumbler cylinders, with components enhancing pick resistance in select models. Shackle diameters range from 1/4 inch for lighter loads to over 1/2 inch in heavy-duty versions, with lengths varying for clearance in hasp installations.

Combination Padlocks

Master Lock combination padlocks employ mechanical dial mechanisms for keyless operation, typically featuring 3 or 4 independent wheels engraved with digits , enabling 1,000 to 10,000 theoretical depending on the model. The company introduced its first padlock in 1935, marking an early in portable devices designed for in settings like and . These locks consist of a body housing the wheel pack and internal , with a that locks upon correct alignment of the , often secured by dual levers or balls to resist shim attacks. Common models include the No. 1500 series, with a 1-7/8 inch (47 mm) wide solid body, 1/4 inch (6 mm) diameter , and 3-digit resettable , suited for indoor uses such as lockers and bags due to its compact size and 40,000-hour resistance in non-extreme environments. The No. 1525 variant adds key control for supervisory override, featuring a 2-1/8 inch (54 mm) laminated steel body and 3/8 inch (9 mm) , enhancing access management in institutional settings. For outdoor applications, the 875TLF model offers a 2 inch (51 mm) body with 1-1/2 inch (38 mm) clearance and resettable 4-digit , tested for weather durability. Higher-security ProSeries models, such as the 1175 and 1177, incorporate hardened bodies, deadlocking mechanisms, and spool pins to deter picking, with 4-digit combinations and key override options for environments requiring greater resistance to manipulation. Materials like boron-carbide reinforced shackles provide cutting resistance up to 7 tons of force in select variants. Despite these features, standard 3-dial models exhibit vulnerabilities to decoding via tension and dial feedback, where subtle clicks reveal gates, reducing effective combinations to approximately 100 attempts rather than 1,000. In , researcher demonstrated a method exploiting internal notch alignments to any such lock in 8 or fewer tries, highlighting design flaws in the serialization process. Automated tools, including 3D-printed decoders, can execute these attacks in under 30 seconds, underscoring that basic models prioritize affordability and ease over high-security applications. Master Lock's ProSeries addresses some issues through refined internals, but independent tests confirm persistent risks from brute-force or advanced manipulation in non-upgraded designs.

Safes, Lockboxes, and Accessories

Master Lock manufactures safes designed for fire and protection, including premium models constructed from high-grade that provide UL-classified resistance to fires for up to 2 hours at temperatures reaching 1850°F (1010°C), along with shielding capabilities. These safes feature organizational interiors and are backed by a limited lifetime against and damage. Portable options, such as the 5900 series personal safes, allow users to set their own combinations and include variants in colors like for targeted applications. Smaller cash boxes, like the 0.21-cubic-foot keyed model and 0.5-cubic-foot electronic keypad versions, cater to compact storage needs for valuables such as money and documents. Lockboxes from Master Lock focus on secure key and access card storage, with standard models offering resettable combinations for controlled in , , and personal use. Portable key safes, such as the MLK5422D with its fitting door knobs and large internal cavity, provide weather-resistant options for temporary key holding. Wall-mount variants like the 5481D accommodate multiple s or fobs and feature durable construction for outdoor installation. Bluetooth-enabled lockboxes extend functionality with app-based remote management, suitable for business and residential . The SafeSpace® series emphasizes convenient, regular-use for spares. Accessories complement these products, including safe-specific items like 5-inch deep organizers for 1.6- to 2.0-cubic-foot models, packs to prevent moisture damage, and file sorters for document . These enhancements support interior customization and maintenance, ensuring longevity in varied environments.

Technological Features and Innovations

Mechanical and Material Advancements

Master Lock's foundational mechanical advancement was the introduction of laminated steel construction in its bodies, patented by founder Harry Soref in 1924. This design layered multiple steel plates riveted together, creating a robust yet cost-effective structure resistant to drilling, cutting, and hammering attacks that could compromise solid-cast alternatives. The innovation addressed pre-1920s vulnerabilities in , where weaker bodies often failed under force, enabling without sacrificing durability. Subsequent material enhancements focused on shackle strength, evolving from standard to compositions for superior . -alloy shackles, featured in models like the ProSeries and Tough-Cut lines, resist bolt cutters up to 50% more effectively than conventional due to their higher tensile strength and hardness. Octagonal boron-carbide variants further improved anti-sawing and prying performance by distributing cutting forces across angled surfaces. Mechanically, Master Lock incorporated dual ball-bearing locking mechanisms in many models to secure the against pulling and attacks, complemented by multi-pin tumbler cylinders (typically 4- or 5-pin) that elevated resistance over earlier single-pin designs. Anti-shim technology, integrated into solid and laminated bodies, prevents unauthorized manipulation via thin tools by blocking shim insertion. Dual-Armor adds thermoplastic sheathing over cores for resistance in harsh environments, extending service life without compromising mechanical integrity. These features, refined iteratively since the mid-20th century, prioritize layered defenses against common physical and manipulative threats.

Electronic and Smart Lock Developments

Master Lock's entry into electronic locks predated its smart offerings, beginning with keypad-operated models in the early . The Electronic Keypad Deadbolt, featuring NightWatch protection and capacity for up to 20 user codes, represented an initial foray into battery-powered access systems that supplemented with programmable entry. These products prioritized reliability in everyday applications like residential doors, using interfaces to reduce reliance on physical keys while maintaining core durability standards. A pivotal advancement occurred in 2015 with the launch of Bluetooth-enabled smart padlocks, such as the 4400 series, which permitted unlocking via proximity detection and eliminated traditional keys or numerical combinations. Development spanned several years, focusing on rugged construction—including boron-alloy shackles and weatherproofing—to match mechanical predecessors' resilience against tampering and environmental exposure. Subsequent models, like the 6400 ProSeries for use, incorporated anti-shim mechanisms and extended life, supporting encrypted (BLE) communication for secure, low-power operation. Integration with the Master Lock Vault app enhanced functionality, providing and users with features such as access audit trails, geofencing for automatic locking, temporary digital sharing, and multi-device management for up to hundreds of locks in scenarios. boxes, including the 5441EC wall-mount model with 3-1/4-inch bodies for storage, extended these capabilities to and , allowing remote code assignment and usage logging. Further expansions included built-in locks like the 3685 series, debuted in 2017 for gyms and spas, offering programmable PIN access and improved over alternatives. By 2024, Master Lock committed to a minimum five-year security update cycle for connected products, addressing vulnerabilities through ongoing BLE refinements and app-based over-the-air updates. These developments positioned and locks as a growing segment, comprising padlocks, door hardware, and accessories tailored for both consumer and professional environments emphasizing remote oversight and scalability.

Corporate Structure and Operations

Ownership and Headquarters Evolution

Master Lock Company was founded on September 2, 1921, by locksmith and inventor Harry Soref in , , initially operating from a single room with five employees before expanding to a dedicated facility. The Soref family retained control through multiple generations, overseeing growth amid post-war demand and product innovations, until internal familial discord prompted the sale of the company in 1970 to , Inc., for an undisclosed sum. American Brands, a diversified , integrated Master Lock into its portfolio, later renaming itself Brands in 1997 to reflect a focus on consumer brands. Ownership remained stable under this structure until 2011, when Brands executed a corporate split, divesting its spirits and tobacco operations into Beam Inc. while spinning off the home and security segment—including Master Lock—into the independent, publicly traded Brands Home & Security, Inc. This entity rebranded to , Inc. in 2020, continuing as Master Lock's parent company without further changes in controlling ownership. The company's headquarters originated in , where production and administrative functions were centralized for over eight decades, including occupancy of a former Pabst site as its second major facility. In 2003, Master Lock shifted its executive headquarters to —a Milwaukee suburb—while preserving manufacturing operations at the historic 2600 N. 32nd Street plant in Milwaukee's Metcalfe Park neighborhood, reducing local production roles to approximately 320. This relocation supported operational efficiencies amid suburban expansion. In May 2017, the company completed an internal headquarters move to a renovated facility in Oak Creek, aimed at accommodating long-term growth in product development and global sales. However, on January 22, 2025, parent company announced the closure of the Oak Creek headquarters and consolidation of corporate functions to its , base, affecting an unspecified number of administrative positions and ending Master Lock's physical presence in after 103 years. This shift aligns with broader and operational consolidations, separate from the prior closure of manufacturing announced in 2023.

Manufacturing Shifts and Global Supply Chain

Master Lock's manufacturing operations were historically concentrated in , , where the company maintained production facilities since its founding in 1921, employing thousands at its peak and establishing itself as a key local employer. By the early 2000s, facing competitive pressures, the company transitioned from to a model incorporating offshore outsourcing for components and flexible assembly operations in , while retaining some U.S. assembly. This shift included establishing a group in and deploying quality-control teams in to manage suppliers. In the 1990s and early , Master Lock increasingly relied on Chinese , contracting with three factories and a network of approximately 20 suppliers there, which accounted for more than half of its production by the mid- as a means to access lower labor and material costs. Parts production continued domestically in for export to facilities like the assembly plant in Nogales, , but the overall trend emphasized cost-driven to . A partial reversal occurred around 2012, when the company reshored approximately 100 jobs from to its plant, citing factors such as rising overseas wages, fuel costs, and complexities, which drew public attention including a visit from President Obama. Recent developments have reversed this reshoring effort, with Master Lock announcing in May 2023 the closure of its remaining manufacturing campus—its last U.S. production site—by March 2024, resulting in the loss of about 330 jobs. The company cited "footprint improvements" to enhance efficiency and profitability, shifting operations to external suppliers and facilities in and . This move aligns with broader adaptations, including responses to disruptions that prompted diversified sourcing, though the core reliance on low-cost Asian production persists. Master Lock maintains offices in , such as in , to oversee regional operations and supplier networks.

Security Performance and Criticisms

Independent Testing and Vulnerabilities

Independent analyses have revealed significant vulnerabilities in Master Lock padlocks, particularly models like the series, where the internal mechanism allows for rapid decoding through tactile feedback. By applying tension to the and systematically testing dials for resistance points, an attacker can determine the first two numbers of the three-digit in under 100 attempts, often narrowing it to eight or fewer final tries to open the lock, a method demonstrated in 2015 by security researcher Matt Blaze. This exploit exploits the design's reliance on a simple notched disk mechanism without sufficient safeguards against manipulation, enabling unauthorized access in minutes without specialized tools. Many Master Lock combination padlocks are also susceptible to shimming, a bypass technique using a thin metal strip inserted between the and body to retract the locking pawl directly, circumventing the combination entirely. This vulnerability stems from the exposed in non-reinforced models, allowing entry in seconds with improvised tools like aluminum cans or commercial shims, as documented in practical demonstrations and analyses of standard designs. In response, Master Lock introduced BlockGuard technology in select models, such as the 875D, which incorporates barriers to prevent shim insertion and tension-based decoding, though independent verification confirms its effectiveness only against basic attacks, not advanced manipulation. Keyed padlocks from Master Lock, including weather-resistant models like the 5401-5403 series, exhibit physical weaknesses exploitable without the key, such as prying or decoding via accessible components. Security evaluations have shown these can be defeated by exploiting shackle geometry for leverage or using decoders on the keyway, highlighting inadequate resistance to non-destructive entry compared to higher-security alternatives. While Master Lock products undergo internal testing for basic durability, independent assessments, often from lockpicking experts and researchers, consistently rate them as low-security suitable only for casual use, with vulnerabilities to picking, impressioning, and cutting via bolt cutters in under 10 seconds for standard shackles. Electronic variants, such as Bluetooth-enabled padlocks, face additional protocol flaws; reverse-engineering of models like the Vault Enterprise revealed unencrypted communications and vectors, allowing unauthorized unlocking via proximity interception, as detailed in peer-reviewed papers. These findings underscore a pattern in Master Lock's design priorities favoring affordability over robust defense against determined adversaries, with no evidence of formal certifications from bodies like UL for high-security applications in most consumer models.

Consumer Reception and Expert Critiques

Consumer reception of Master Lock products, particularly padlocks and combination locks, has been generally positive for everyday convenience and durability in low-stakes applications such as securing lockers, luggage, or bicycles against opportunistic , with average ratings around 3.6 to 4.5 out of 5 on retail sites like and based on thousands of reviews emphasizing ease of use and resettable combinations. However, security concerns dominate negative feedback, with users frequently reporting failures against bolt cutters, shimming, or basic picking, leading to overall scores as low as 1.6 out of 5 from 87 reviews citing poor resistance to tampering and misleading durability claims. Consumer Reports testing of models like the 8143D bike lock cable concluded it performs poorly in security tests and suits only accessory or non-critical uses, underscoring limitations for deterrence. Expert critiques highlight systemic vulnerabilities in Master Lock's mechanical designs, with lockpicking specialist Bosnianbill and the demonstrating in videos that many models, including those rated up to 8 or 10 for by the manufacturer, succumb to pins and basic techniques in under 5 minutes due to sloppy tolerances and lack of pins or milling. The has repeatedly exposed "inexcusable design flaws" in bodies and mechanisms, such as exploitable vulnerabilities allowing non-destructive bypasses, while noting that Master Lock's ratings prioritize physical sturdiness over to , misleading consumers about actual levels. Although some higher-end models show marginal improvements, experts consensus in lockpicking communities and analyses maintains that Master Locks offer inadequate against skilled or tool-equipped adversaries, recommending them solely for casual deterrence rather than reliable safeguarding.

References

  1. [1]
    About Us - Master Lock
    Master Lock is an authority in locks and safes, known for over a century of confidence, security, strength, precision, and reliability.
  2. [2]
    Master Lock Company - Company-Histories.com
    1924: Founder Harry Soref patents first laminated steel padlock. ... Company History: Master Lock Company produces several lines of premium security lock products ...
  3. [3]
    Master Lock Has Had a Hold on the Industry for 100 Years
    May 17, 2021 · A century ago, Harry Soref made his Milwaukee-based company into a world leader with his invention of the laminated steel padlock.
  4. [4]
    Master Lock world headquarters in Oak Creek closing, 120 jobs ...
    Jan 23, 2025 · The closure is part of a consolidation of offices by Fortune Brands Innovations, Inc., the parent company of Master Lock, to a new headquarters ...
  5. [5]
    Master Lock Company, LLC - Encyclopedia of Milwaukee
    Sep 21, 2017 · Founded in 1921 by Harry Soref, Master Lock, headquartered in Oak Creek, is a subsidiary of Fortune Brands. It had a Milwaukee factory, which ...Missing: products | Show results with:products
  6. [6]
    History of Master Lock Company - FundingUniverse
    Wholly Owned Subsidiary of Fortune Brands, Inc. ; Incorporated: 1921 ; Employees: 1,500 ; Sales: $200 million (2000 est.) ; NAIC: 332510 Hardware Manufacturing ...Missing: current | Show results with:current
  7. [7]
    Master Lock's long history of providing Milwaukee jobs is over
    May 25, 2023 · Despite a recession and growing competition, the Master Lock Company continued to produce tens of millions of padlocks a year.
  8. [8]
    Fortune Brands Home & Security (NYSE - Investors
    Fortune Brands Home & Security's trusted brands include Master Lock, MasterBrand cabinets, Moen faucets, Simonton windows and Therma-Tru entry door systems.<|control11|><|separator|>
  9. [9]
    Master Lock's parent company: What we know about Fortune Brands
    Jun 15, 2023 · Master Lock was bought by American Brands, Inc., which later became Fortune Brands. In 2011, Fortune Brands spun off its home and security business as an ...<|separator|>
  10. [10]
    History - Fortune Brands Innovations
    Dec 14, 2022 · Master Lock celebrates its 100-year anniversary, marking a century of helping people, businesses and communities across the globe secure what's ...
  11. [11]
    Master Lock's Milwaukee plant to close after 100 years and send ...
    Jun 29, 2023 · 'Only holdout' in area that used to house over 50 manufacturing firms to halt operations in March 2024 with over 400 jobs lost.
  12. [12]
    Master Lock's 2024 Factory Closure in Wisconsin Shows How ...
    Master Lock's 2024 Factory Closure in Wisconsin Shows How NAFTA is Still Betraying American Workers. New York Times Magazine Contributing Writer Dan Kaufman ...
  13. [13]
    2024 Master Lock plant closure still looms large
    Jan 30, 2025 · Master Lock announced it will close its Oak Creek headquarters and move operations to Deerfield, Illinois. In 2024, Master Lock closed its production facility.Missing: 21st | Show results with:21st
  14. [14]
    County Executive David Crowley Statement on Master Lock Parent ...
    Jan 23, 2025 · “I am once again deeply disappointed by the owner of Master Lock for their decision to close its Oak Creek office and move over 100 good-paying, ...Missing: challenges 21st
  15. [15]
    Durable Padlocks for Security Needs - Master Lock
    Master Lock has the perfect padlock for you. We offer a wide variety of styles, materials, and keying options so you can find the perfect lock.Missing: features | Show results with:features
  16. [16]
    https://store.masterlock.com/collections/padlocks
  17. [17]
    https://mrlock.com/padlock-1-size-keyed-different-random/
  18. [18]
    Choose the Best Padlock - Master Lock
    ProSeries® high security padlocks are available in five styles including Weather Tough®, High Security Iron Shroud, Solid Steel, Solid Brass and Solid Aluminum.
  19. [19]
    Padlock Master Keyed System - Master Lock
    Master Lock provides and will maintain Key Record-keeping for padlock Master Key Systems. A Master Key System Record is a listing of all the assigned key cuts.
  20. [20]
    Master Lock 3SSQ Stainless Steel Outdoor Padlock with Key, 4 Pack ...
    Padlock with key is best used for marine recreation, saltwater applications, offshore security environments and severe uses · Key lock features a stainless-steel ...
  21. [21]
    Cracking Single Dial Combination Locks - Instructables
    Step 1: Spin the dial clockwise several times. You only need to spin it around 3 full revolutions, but it doesn't hurt if you spin it more.
  22. [22]
    https://store.masterlock.com/collections/combination-locks
  23. [23]
    Master Lock Black Gym Locker Lock Combination Padlock, Indoor ...
    Indoor padlock is best used as a school locker lock and gym lock, providing protection and security from theft. · Preset three-digit combination lock; one ...
  24. [24]
    1525 Combination Lock | Master Lock
    The Master Lock No. 1525 3-digit combination padlock includes key control feature for supervisory access along with many enhanced security features.
  25. [25]
    Outdoor Combination Lock, 1-1/2 in. Shackle, Resettable, 2 Pack
    Rating 4.2 (1,025) The Master Lock 875TLF Outdoor Combination Lock with Resettable Combination (Two Pack) features a 2 in. (51 mm.) wide zinc body for strength and reliability ...
  26. [26]
    https://allpadlocks.com/pages/master-lock-proseries-combination-padlocks
  27. [27]
    Easily Cracking a Master Combination Lock - Schneier on Security
    May 5, 2015 · Kamkar told Ars his Master Lock exploit started with a well-known vulnerability that allows Master Lock combinations to be cracked in 100 or fewer tries.
  28. [28]
    Crack Master Combo Locks in 8 Tries - samy kamkar
    Master Combo Locks have been known to be vulnerable to an attack reducing their 64,000 possible combinations down to 100. I've devised a new attack reducing ...Missing: methods | Show results with:methods
  29. [29]
    Master Lock combinations can be cracked in minutes, hacker says
    Apr 29, 2015 · A technique to crack under two minutes any combination by Master Lock has been posted online by a hacker.
  30. [30]
    This Little 3-D Printed Robot Cracks Combination Locks in 30 Seconds
    May 14, 2015 · An invasion of 3-D printed robots may be coming, capable of popping combination locks in as little as half a minute.<|separator|>
  31. [31]
    Home Safes | Fire and water protection - Master Lock
    Protect your valuables with Master Lock's premium 2-hour fire and water safes. Ensure your important items are secure and organized.
  32. [32]
    Master Lock Premium 2-Hour Fire and Water Safes
    Master Lock's new Premium 2-Hour Fire and Water Safes offer unmatched protection. Built with high-grade steel and backed by a limited lifetime warranty.
  33. [33]
    Safes - Master Lock
    6–7 day delivery 14-day returns5900DPNK. Set Your Own Combination Portable Personal Safe; Pink. List Price: $45.06.
  34. [34]
    Master Lock Safes at Lowes.com
    Master Lock 0.21-cu ft Keyed Cash Box Safe · Master Lock Water Resistant Nylon Locking Bag · Master Lock 0.5-cu ft Safe box with Electronic/Keypad Lock · Master ...
  35. [35]
    Lock Boxes & Safes - Master Lock
    Manage access to your property no matter where you are. Standard lock boxes offer key control with resettable combinations. Bluetooth lock boxes offer more ...
  36. [36]
    Master Lock Portable Key Safe MLK5422D - The Home Depot
    Rating 4.2 (262) · 90-day returnsKey safe features a wide, durable construction with a shackle design to fit conveniently on door knobs. Large internal cavity and removable key lock prevent ...
  37. [37]
    https://store.masterlock.com/products/large-wall-mount-key-lock-box-5481d
  38. [38]
    Bluetooth Lock Boxes - Master Lock
    6–7 day delivery 14-day returnsCategory · Business Use · Personal Use. Close Filters. Best Used For. Real Estate Access Control. Security Gates & Fences. Spare Key & Access Card Storage.
  39. [39]
    Service and Support - Videos: Lock Boxes - Master Lock
    Dec 18, 2012 · The Master Lock SafeSpace® Lock Boxes provide secure storage of keys or access cards in a convenient location for regular use.
  40. [40]
    https://store.masterlock.com/collections/safe-accessories
  41. [41]
    Accessories for Locks & Keys - Master Lock
    Best Used For Backpacks, Duffel Bags & Sports Bags Bicycles Briefcases & Computer Bags Cabinets Cash Handling & Document Storage Commercial Showrooms Door ...
  42. [42]
    M1XTRILH Laminated Padlock - Master Lock
    Tough-Cut™ octagonal boron-carbide shackle is 50% harder than hardened steel; 2in (51mm) Shackle clearance for more uses; Dual-Armor® protection: 1-3/4in ...Missing: advancements | Show results with:advancements
  43. [43]
    930DLHPF Solid Body Padlock - Master Lock
    The 7/16in (11mm) diameter shackle is 2in (51mm) long and made of hardened boron alloy, offering maximum resistance to cutting and sawing. The 5-pin cylinder ...Missing: advancements | Show results with:advancements<|control11|><|separator|>
  44. [44]
    Master Lock Black Magnum Keyed-Alike Padlocks with All-Weather ...
    WEATHERPROOF LOCK: Dual armor construction includes thermoplastic cover over laminated steel lock body for performance even in the harshest outdoor ...Missing: mechanical innovations advancements
  45. [45]
    Videos: Electronic Keypad Deadbolt - Master Lock
    Mar 4, 2013 · Electronic Keypad Deadbolt. Store up to 20 different user codes with NightWatch® protected Electronic Keypad Deadbolt. View video. Learn More ...
  46. [46]
    New Master Lock Bluetooth Smart Padlocks Combine Security ...
    Nov 3, 2015 · The Master Lock Bluetooth Smart Padlocks will be available in October 2015 for an MSRP of $50 for the indoor Bluetooth Smart Padlock and $60 ...
  47. [47]
    Master Lock Celebrates 100 Years - PR Newswire
    Feb 2, 2021 · Founded in 1921 by traveling locksmith and Russian immigrant, Harry Soref, Master Lock's legacy is born in strength. What started as Soref's ...
  48. [48]
    Technology opens new pathways to growth for Master Lock - BizTimes
    Apr 3, 2017 · The development of the Bluetooth padlock was several years in the making. ... electronic locks needed to be as robust as traditional padlocks. To ...
  49. [49]
    4401LHEC Bluetooth & Electronic Locks - Master Lock
    $$223.24 Rating 2.8 (4) · 6–7 day deliveryThe free Master Lock Vault Home iOS and Android apps are designed for personal use, supporting up to 10 locks, and allows you to monitor access history ...Missing: timeline | Show results with:timeline
  50. [50]
    Smart Security Starts Here. - Master Lock
    Master Lock Bluetooth locks, lock boxes and door hardware come with powerful software to pair with and manage locks and users. Learn more now.Bluetooth® & Electronic Locks · Master Lock Vault App · Lock Boxes
  51. [51]
    5441EC Bluetooth & Electronic Locks - Master Lock
    $$182.70 6–7 day delivery 14-day returnsThe Master Lock No. 5441EC Bluetooth® Wall Mount Lock Box features a 3-1/4" (83mm) wide metal body for durability. Secure your home or business.Missing: timeline | Show results with:timeline
  52. [52]
    Master Lock® Debuts Best-In-Class Electronic Built-In Locker Lock
    Mar 7, 2017 · Master Lock, the world leader in locker lock technology, introduces the Electronic Built-In Locker Lock, designed for health clubs, gyms, spas ...
  53. [53]
    BUILT: The Master Lock Story | Mossy Oak
    Dec 12, 2022 · Master Lock, the pillar brand in the world of security, began in 1921 by inventor and locksmith Harry Soref. Soref was an inventor by nature and ...
  54. [54]
    Master Lock - Lockwiki
    Jun 5, 2025 · History. Master Lock was founded in 1921 by Harry Soref, P.E. Yolles, and Sam Stahl. Soref invented and patented a padlock in 1924 that used ...
  55. [55]
    Fortune Brands Announces Agreement to Acquire Emtek and ...
    The Acquisition is conditioned on the successful closing of the acquisition by ASSA ABLOY from Spectrum Brands, Inc. of its Hardware and Home Improvement ...
  56. [56]
    The Master Lock Company Completes Global Headquarters Move ...
    May 4, 2017 · The Master Lock Company, a global leader in security and safety solutions, today announced its completed global headquarters relocation to a newly renovated ...Missing: evolution | Show results with:evolution
  57. [57]
    Master Lock to close headquarters in Oak Creek, move jobs to Illinois
    Jan 23, 2025 · Fortune Brands Innovations Inc., the company that owns Master Lock, announced the corporate office consolidation Wednesday. The move comes less ...
  58. [58]
    Master Lock parent company's consolidation to new Illinois HQ will ...
    Jan 22, 2025 · ... to relocate to Illinois as part of a new headquarters consolidation by Fortune Brands Innovations, the parent company of Master Lock.
  59. [59]
    Master Lock moving world headquarters from Oak Creek to ...
    Jan 23, 2025 · Master Lock is closing its world headquarters in Oak Creek and relocating jobs to a new headquarters in Deerfield, Illinois, according to the Milwaukee Journal ...
  60. [60]
    Master Lock Finds The Right Combination For Supply-Chain ...
    Dec 1, 2000 · In 1996, the 75-year-old company owned by Fortune Brands, served three market segments in the U.S. and Canada: commercial customers, retail ...
  61. [61]
    Master Lock reassessing China - Milwaukee Journal Sentinel
    Jan 1, 2011 · It contracts with three Chinese factories and a network of some 20 Chinese suppliers. In the early part of the decade, more than half of all ...Missing: facilities | Show results with:facilities
  62. [62]
    Obama Hails Master Lock For Bringing Jobs Home - NPR
    Feb 15, 2012 · He toured the Master Lock plant, which has recently brought manufacturing jobs back to the US from China. The plant is running at full ...Missing: facilities | Show results with:facilities
  63. [63]
    Master Lock Closing Headquarters, Leaving Wisconsin After More ...
    Master Lock is leaving Wisconsin entirely. On Wednesday, the company's parent, Fortune Brands Innovations, announced the closure of its Oak Creek headquarters.
  64. [64]
    Master Lock parent company 'footprint improvements,' including ...
    May 25, 2023 · Master Lock parent company 'footprint improvements,' including planned shutdown of Milwaukee plant, aim to boost profits up to $75 million.<|control11|><|separator|>
  65. [65]
    Master Lock's pandemic pivot | The Supply Chain Xchange
    Dec 12, 2021 · Master Lock was able to successfully adapt its supply chain amid the challenges of the pandemic. Today, the company continues to benefit from ...
  66. [66]
    Find Master Lock Office Locations Worldwide
    China: Master Lock Shanghai Co., Ltd. Unit A-2, 8th Floor, Lu Jia Zui Investment Building 360 Pu Dian Road Pudong, Shanghai 200120 China. Main Hotline: 400 ...Missing: production | Show results with:production
  67. [67]
    How to crack many Master Lock combinations in eight tries or less
    Apr 28, 2015 · There's a vulnerability in Master Lock branded padlocks that allows anyone to learn the combination in eight or fewer tries, a process that ...
  68. [68]
    MasterLock Combination Lock Vulnerabilty and Exploit - War Room
    May 14, 2015 · MasterLock locks are vulnerable because resistance points when lifting the shackle reveal clues about the combination, specifically the first ...Missing: padlock | Show results with:padlock
  69. [69]
    The Secret Weapon for Opening Padlocks: Shims - LockJudge
    May 22, 2022 · Yes, dialing in the correct three-digit combination releases a spring-loaded lever that is susceptible to exactly the same type of bypass attack ...
  70. [70]
    [PDF] BlockGuard™ Anti-Shim Technology
    locking mechanism from physical attack. • Dial automatically locks under shackle tension to prevent "feeling out" the combination. • Fits lockers with a ...
  71. [71]
    875D Combination Lock | Master Lock
    Rating 4.5 (27) · 6–7 day delivery... shim, and rap attacks. This padlock is strong and reliable enough to use on sheds, gates, toolboxes, storage lockers, and more! Yes, I recommend this ...
  72. [72]
    Master Lock Padlock Security Level 4 - 10 Picking & Cutting Test
    Jul 25, 2017 · Master Lock Padlock Security Level 4 - 10 Picking & Cutting Test ✓ Click SHOW MORE for all the Links As an Amazon Associate I earn ...Missing: independent analysis
  73. [73]
    [PDF] No Key, No Problem: Vulnerabilities in Master Lock Smart Locks
    Aug 12, 2025 · In this paper, we analyze the Master Lock D1000 Blue- tooth deadbolt lock. Previous work identified security vul- nerabilities in Master Lock ...
  74. [74]
    Reviews for Master Lock Combination Lock, Resettable 3-Dial | Pg 1
    Rating 3.6 (1,030) · Free in-store returnsCustomers say the Master Lock combination lock is easy to set up and use, making it suitable for light-duty applications such as gym lockers and luggage.Missing: consumer | Show results with:consumer
  75. [75]
    Customer reviews for Master Lock Aluminum 30 mm (1-3 ... - Walmart
    Free 90-day returnsGreat locks · Never forget your key again with combination lock · Easy to use · Lock · Nothing wrong with it · Great lock · Nice · Broke easily.
  76. [76]
    Master Lock Reviews 87 - Trustpilot
    Rating 1.6 (87) Master Lock Reviews 87. Locksmith ... Master Lock is an American company that develops padlocks, combination locks, safes and related security products.Missing: consumer | Show results with:consumer
  77. [77]
    Master Lock Bike Lock Cable with Combination (8143D)
    It did not perform well in our tests and should only be considered for accessory or non-security uses.
  78. [78]
    [845] Master Locks With INEXCUSABLE Design Flaws - YouTube
    Mar 2, 2019 · LockPickingLawyer. 4.63M ... (1532) Master Lock Trailer Couplers (379ATPY & 389DAT) (JUNK!) Bill Johnson•105K views · 8:15 · Go to channel ...
  79. [79]
    This master lock is rated 8 on security, it definitely is not. Decent ...
    Oct 29, 2020 · This master lock is rated 8 on security, it definitely is not. Decent bidding but all standard pins, took me like 5 mins and 8 have been picking a week.
  80. [80]
    (663) Vulnerability DESIGNED INTO Master Lock & American ...
    Apr 2, 2015 · IN this video I'll demonstrate a vulnerability that MasterLock and American Locks have built into their padlock bodies.
  81. [81]
    Security rating 10 of 10? : r/lockpicking - Reddit
    Jan 15, 2024 · It is a well known fact among pickers that Master Lock grade their locks by physical sturdiness, not by picking resistance.
  82. [82]
    How secure are Master Lock locks? Can they be easily broken open ...
    Nov 14, 2022 · On the low end, their locks have sloppy tolerances and no security pins/millings. Such a lock can likely be opened quicker then with the key ...