Pin - Grokipedia

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A pin is a small, slender, and often pointed device, typically made of metal, wood, or similar rigid material, designed to fasten, support, or attach two or more objects or components together by insertion through holes or fabric.^[1] Pins have been utilized since ancient times, with precursors like the Roman fibula serving as early fasteners for clothing and garments, evolving into modern forms through innovations in manufacturing during the 19th century.^[2]^[3] In everyday and domestic contexts, pins include straight pins for sewing and tailoring, where they temporarily hold fabric layers in place, and safety pins, which feature a coiled wire clasp to prevent accidental pricks and secure items like clothing or diapers.^[1] These common pins, often produced from drawn steel wire, became widely available after mass-production techniques were patented in the United States in 1832 by John Ireland Howe, revolutionizing their accessibility and affordability.^[3] Beyond household use, pins serve ornamental purposes, such as in badges or brooches, and practical roles like marking locations on maps or stabilizing medical dressings.^[1] In engineering and mechanical applications, pins function as unthreaded fasteners to align, locate, or join components in assemblies, with types including dowel pins for precise positioning in jigs and fixtures, cotter pins for securing axles and hubs, clevis pins for pivot connections, and spring pins for vibration-resistant joints.^[4]^[5] These industrial pins, commonly cylindrical or tapered and made from materials like stainless steel or alloyed metals for durability and corrosion resistance, are inserted into pre-drilled holes to distribute loads and ensure structural integrity in machinery, vehicles, electronics, and construction.^[6] Specialized variants, such as coiled spring pins invented in 1948, provide compressible resilience for dynamic environments.^[7] Overall, pins remain essential across scales from personal accessories to heavy-duty engineering due to their simplicity, versatility, and reliability.^[5]

History

Origins in sewing and fashion

The earliest known pins used for fastening clothing originated in ancient civilizations, where they served both practical and ornamental purposes. In predynastic Egypt around 3000 BCE, copper pins were crafted during the Naqada period to secure garments, as evidenced by archaeological finds from sites like Naqada and Ballas.^[8] These early implements, often simple straight pins, were supplemented by bone and wood variants for everyday use in holding together draped fabrics.^[9] By the time of ancient Rome, pins evolved into more sophisticated fibulae—brooch-like fasteners made of bronze or other metals—that replaced simpler straight pins from the Neolithic and Bronze Ages, allowing for secure attachment of togas, cloaks, and tunics while displaying status through decorative elements.^[10] In medieval Europe, pins gained cultural significance beyond mere utility, becoming integral to fashion and social identity. Decorative pins, often with ornate heads, were used to fasten outer garments and headwear, evolving from earlier bone and bronze forms into more refined pieces that signified wealth or allegiance.^[9] Livery badges, distributed by lords to retainers, were frequently attached via pins or sewn onto clothing, symbolizing loyalty and service within feudal hierarchies; these badges, sometimes gilded or enameled, blended functionality with heraldic display.^[11] During the Victorian era (1837–1901), pins took on profound symbolic roles in mourning fashion, adhering to strict etiquette that dictated their use in commemorating the deceased. Mourning pins, often crafted from jet, onyx, or woven human hair set in black enamel, were worn to secure veils, capes, or brooches, embodying grief while maintaining social decorum; these items extended the medieval tradition of memento mori jewelry into a codified practice influenced by Queen Victoria's prolonged mourning for Prince Albert.^[12]^[13] Such pins not only fastened attire but also served as personal talismans, with hairwork examples symbolizing enduring bonds to the lost. Key developments in pin usage for sewing and fashion included regulatory efforts in England, where in 1483 King Richard III prohibited imports of French pins to bolster domestic production, marking an early push for localized manufacturing amid rising demand for apparel fasteners.^[14] The invention of the sewing machine in the mid-19th century, patented by Elias Howe in 1846 and popularized by Isaac Singer from 1851, dramatically increased pin demand by accelerating garment assembly and requiring more precise temporary fastenings during construction and fitting.^[15] This technological shift transformed pins from occasional accessories into essential tools in the burgeoning ready-to-wear industry.

Evolution of production techniques

The production of pins transitioned from artisanal craftsmanship to mechanized processes in the early 17th century, with the establishment of the first dedicated pin-making factory in Gloucestershire, England, by John Tilsley in 1626, which adopted Dutch techniques for drawing brass wire into rods suitable for cutting and heading.^[16] In France, pin making had earlier roots in medieval guilds, such as the Paris pin makers' guild founded in 1268, but by the 17th century, production in regions like Normandy incorporated similar Dutch wire-drawing methods, enabling more efficient creation of brass pins from imported wire supplies.^[17] These developments marked the shift from hand-forged iron pins to standardized brass ones, laying the groundwork for larger-scale manufacturing amid growing demand from sewing applications.^[18] During the 18th century, the division of labor became a cornerstone of pin production efficiency, as exemplified by Adam Smith's 1776 description in The Wealth of Nations, where he detailed approximately 18 specialized operations—from wire drawing and straightening to pointing and heading—that allowed a small team of 10 workers to produce up to 48,000 pins daily, compared to just one pin per worker without specialization.^[19] This approach, inspired by French manufacturing descriptions from the Academy of Sciences around 1675, emphasized task allocation by skill level, with coarser work like cutting assigned to less experienced laborers and finer tasks like grinding to experts, dramatically reducing costs and increasing output during the early stages of the Industrial Revolution.^[20] Standardization emerged as factories proliferated, with English production centering in Gloucester, where water-powered mills began assisting wire processing by the late 18th century, though full mechanization awaited 19th-century patents.^[21] The 19th century brought significant innovations in machinery, exemplified by Lemuel W. Wright's 1824 patent for a solid-headed pin machine that produced 40 to 50 pins per minute from a single wire, licensed to English firms and marking a move toward semi-automation.^[21] In the United States, John I. Howe patented a practical pin-making machine in 1832 and established the Howe Manufacturing Company in New York in 1833, the first dedicated U.S. pin factory, which relocated to Connecticut in 1836 and achieved commercial success by producing spun-headed pins at scale.^[3] By mid-century, steam-powered machines in English factories like Kirby Beard & Co. integrated wire drawing, cutting, and pointing, boosting output to 180 pins per minute per machine, while the introduction of solid-head forming reduced waste.^[21] These advancements standardized pin dimensions during the Industrial Revolution, with factories employing hundreds in coordinated lines. The pin trade played a pivotal role in early industrialization by demonstrating the economic benefits of the factory system, where division of labor and machinery lowered unit costs from pence per thousand in the 18th century to fractions of a penny by the mid-19th, facilitating broader textile production and contributing to Britain's export economy.^[22] However, labor conditions were harsh, particularly for children tasked with repetitive heading and sorting, as documented in Charlotte Elizabeth Tonna's 1843 account of "little pin-headers" enduring 12- to 14-hour shifts that caused physical deformities and exhaustion, prompting early calls for reform amid the exploitative dynamics of emerging factories.^[19] By the 1920s, further automation through coil-fed wire machines—feeding pre-coiled brass stock directly into cutting and heading mechanisms—allowed single operators to oversee production of hundreds of thousands of pins daily, completing the shift from manual to fully mechanized processes while reducing labor intensity but sustaining factory oversight roles.^[21]

Types of Household Pins

Straight pins

Straight pins, essential tools in sewing and crafting, consist of a slender metal shaft with a sharp point at one end and a head at the other for easy handling. The shaft typically measures 1 to 2 inches (2.5 to 5 cm) in length and 0.5 to 0.8 mm in diameter, allowing insertion into various fabrics without excessive damage, while the head is often made of glass or plastic to facilitate gripping and prevent burns during ironing.^[23]^[24] The point is finely sharpened to pierce materials cleanly.^[23] Variations of straight pins are designed for specific sewing tasks, differing in length, thickness, and material properties. Dressmaker pins are long and thin, typically around 1.5 to 2 inches with a fine shaft, making them suitable for general fabric handling in garment construction.^[23]^[25] Quilting pins feature longer shafts (up to 2.125 inches) and rust-resistant nickel-plated steel construction, ideal for securing multiple layers of fabric without corrosion during extended projects.^[23]^[25] Appliqué pins are shorter and finer, often 0.75 to 1 inch in length, to minimize distortion when pinning delicate motifs for hand stitching.^[23] In manufacturing, straight pins are produced from steel wire coils through automated processes that ensure precision and efficiency. Wire from 100-foot rolls is unwound, straightened, and cut into segments of 1 to 1.25 inches using rotating blades, followed by heading where one end is stamped against a block to form a flattened or mushroomed head via automated insertion.^[24] The pins are then sharpened on grinding wheels and electroplated with nickel-sulfate for rust resistance and shine.^[24] Straight pins serve primarily for temporary holding of fabric layers during sewing, such as aligning seams or marking patterns on material.^[23] To use them safely, insert pins perpendicular to fabric edges with heads facing outward for easy removal, reducing the risk of skin punctures; always remove pins before sewing over them to avoid needle breakage or injury.^[26]^[23] Discarding bent or rusted pins prevents accidents, and a magnetic wand can help retrieve dropped ones without direct handling.^[26]^[23]

Safety and general purpose pins

The safety pin, a fastening device featuring a protective clasp, was invented by American mechanic and inventor Walter Hunt in 1849 to address the hazards of traditional straight pins. Hunt crafted the design from a single piece of brass wire, forming a straight shaft, a coiled spring for tension, and a clasp that covers the sharp point to prevent accidental pricks or injuries. He received U.S. Patent No. 6,281 on April 10, 1849, but sold the rights for just $400, underestimating its future widespread use.^[27]^[28]^[29] This design evolved from earlier straight pins employed in household sewing, incorporating the spring and clasp for enhanced safety during everyday handling. Safety pins are typically sized from 00 (the smallest, measuring about 3/4 inch) to 4 (up to 3 inches), allowing selection based on the thickness of material being fastened.^[30]^[31] Variations of safety pins cater to specific needs, such as diaper pins, which are larger (often size 2 or 3) and equipped with plastic-coated or locking heads to minimize injury risk and improve hygiene in baby care applications like securing cloth diapers. Jewelry safety pins, meanwhile, serve decorative purposes in fashion and crafting, frequently adorned with beads, charms, or enamel for use as brooches, earrings, or accessories. Modern iterations often incorporate plastic components in the clasp or head to enhance hygiene and prevent rust, particularly in medical or infant contexts.^[32]^[2] Safety pins have proven invaluable in emergency situations; during World War II, they were standard in soldiers' first aid kits for fastening dressings, slings, and makeshift repairs to uniforms or gear. Their primary applications include temporarily securing fabrics, papers, or clothing without causing permanent damage, such as basting garments during sewing, holding patterns in place, or attaching items like hems or closures.^[33]^[34]^[31] Beyond safety pins, general purpose household pins encompass versatile designs for non-sewing tasks. Bobby pins, U-shaped clips invented by cosmetics manufacturer Luis Marcus in the 1920s to secure bobbed hairstyles popularized after World War I, are essential for hair styling and quick fixes like holding cables or bookmarks. Map pins, also known as push pins, were patented by Edwin Moore in 1900 and feature a colored plastic or wooden head on a sharp steel point, ideal for marking locations on bulletin boards, maps, or planners without tearing surfaces.^[35]^[36]

Industrial and Specialty Pins

Headless steel pins

Headless steel pins consist of a simple, unadorned shaft crafted from high-carbon steel wire, featuring either a straight or slightly tapered profile without any head for unobtrusive insertion. These pins are commonly nickel-plated or made from stainless steel to enhance corrosion resistance, preventing rust in humid environments. Typical lengths vary from 1/4 inch (6.35 mm) for fine craft applications to 1 inch (25.4 mm) for general use, though specialized variants extend to 1.5 inches (38 mm).^[24]^[37]^[38] Among the types, common headless steel pins serve versatile roles in crafts such as securing corsages and pattern modeling in sewing, where their slim profile allows precise, temporary holds without marring delicate materials. Entomology pins represent a specialized subset, designed for mounting insect specimens and graded by size from 000 (thinnest at 0.25 mm diameter) to 8 (up to 0.76 mm diameter), with all sizes sharing a standard length of approximately 38 mm for consistent display in collections. These entomology pins are often fabricated from stainless steel to ensure durability and resistance to environmental degradation during long-term storage.^[39]^[38]^[40] The production of headless steel pins begins with drawing high-carbon steel wire from heated bars rolled into thin rods, which are then pulled through progressively smaller dies to achieve the desired gauge. The wire coils are acid-cleaned, cut to length, and the points are sharpened via grinding on rotating wheels to create a fine, penetrating tip. Unlike headed varieties, no additional forming step is required for the blunt end, and the pins undergo electroplating in a nickel-sulfate bath at low voltage (1-6 volts) for a protective, shiny finish that bolsters rust prevention.^[24]^[41] In practical applications, headless steel pins excel in subtle fastening tasks, such as affixing notes or images to bulletin boards, anchoring elements in floral arrangements like bouquets, and mounting scientific specimens for study. Their lack of a head provides a key advantage in invisibility, enabling seamless integration into displays or fabrics without visible protrusions, making them ideal for light, non-structural duties akin to general-purpose pins but with enhanced discretion.^[24]^[42]^[38]

Mechanical fastening pins

Mechanical fastening pins are specialized fasteners designed for secure, load-bearing connections in engineering applications, providing precise alignment, shear resistance, and pivot functionality in machinery, construction, and structural assemblies. These pins differ from general-purpose or decorative variants by their emphasis on durability under mechanical stress, often incorporating hardened materials to withstand high loads and vibrations. They are integral to assemblies requiring reliable joint integrity without permanent deformation or failure. Key types include dowel pins, cotter pins, and clevis pins. Dowel pins, typically cylindrical and precision-ground, ensure accurate alignment of components in assemblies such as jigs, fixtures, and machine tools.^[43] Cotter pins, featuring a split, wire-like design with one longer prong, resist vibration by expanding after insertion to lock parts in place.^[44] Clevis pins, characterized by a head on one end and a cross-hole on the other, facilitate hinged connections in linkages and yokes, often secured with a cotter pin or clip.^[45] These pins are commonly manufactured from hardened alloy steel or carbon steel for superior strength and wear resistance, with options in stainless steel for corrosion-prone environments.^[46] Diameters range from 1/16 inch to 1 inch, accommodating various load requirements, while lengths vary incrementally to suit specific applications.^[43] Standards such as ASME B18.8.1 govern clevis and cotter pins, specifying dimensions like nominal diameters from 3/16 to 2 inches for clevis pins and 1/32 to 3/4 inch for cotter pins, ensuring interchangeability.^[45] ASME B18.8.2 covers dowel pins, defining tolerances for standard (0.0002 inch over nominal) and oversize series to support precise fits.^[47] In function, these pins primarily prevent shear forces by distributing loads across the joint and enable pivoting motion as hinges in mechanisms.^[43] Dowel pins, for instance, handle single shear loads up to 102,000 pounds for 1-inch diameters in alloy steel.^[43] Cotter pins secure axles or rods against axial movement, while clevis pins form removable pivot joints in control linkages. Installation methods include press-fitting dowel pins into reamed holes for interference fits, often requiring hole diameters 0.0005 to 0.0015 inch smaller than the pin for materials like steel or aluminum.^[43] Taper pins, a variant under the same standards, use a conical shape for self-locking insertion without pressing.^[47] Historically, mechanical pins like cotter pins were employed in early steam engines to connect piston rods to crossheads, contributing to the reliability of 19th-century industrial machinery.^[44] In modern contexts, they support critical applications in aerospace for component positioning in engines and airframes, and in automotive assemblies for suspension systems and drivetrains, where precision and vibration resistance are paramount.^[48]^[49] Production techniques for these pins adapt basic wire drawing and heading methods, scaled for high-precision grinding and heat treatment.^[47]

Materials and Manufacturing

Common materials used

Pins are primarily constructed from steel and its variants, selected based on the required balance of flexibility, strength, and durability for specific applications. Low-carbon steel, containing less than 0.30% carbon, is favored for its flexibility and formability in household items like sewing pins, where bending without breaking is essential.^[50]^[51] High-carbon steel, with more than 0.60% carbon such as spring steel (>0.5% carbon), provides superior hardness and tensile strength for mechanical fastening pins that endure high stress and shear forces.^[50]^[52] Stainless steel, alloyed with chromium and nickel, offers excellent corrosion resistance, making it ideal for safety pins and industrial applications exposed to moisture or chemicals.^[52]^[53] Alternative materials expand pin functionality beyond steel's properties. Brass, an alloy of two-thirds copper and one-third zinc, is non-magnetic and polishes to a high luster, suiting decorative or non-industrial safety pins where aesthetics and ease of shaping are prioritized over extreme strength.^[52]^[54] Aluminum, particularly alloys like 7075, provides lightweight construction with good strength-to-weight ratio, commonly used in aerospace mechanical pins to reduce overall component mass without compromising performance.^[55]^[56] Plastic, often nylon or ABS for disposable safety pins, enables cost-effective, lightweight options for temporary uses like garment assembly or medical dressings, though it lacks the durability of metals.^[57] Wood is used for certain non-industrial pins, such as in crafts or historical sewing applications, offering a natural, lightweight alternative but limited strength. Material selection hinges on key properties such as tensile strength, which for standard steel pins typically ranges around 60,000 psi to ensure they withstand pulling forces without deformation.^[58] Plating enhances these properties; zinc plating on carbon steel improves corrosion resistance for everyday pins, while gold or nickel plating on brass adds aesthetic appeal and additional durability for decorative variants.^[59]^[52] These choices directly influence pin types, as low-carbon steel suits flexible straight pins for sewing, whereas high-carbon variants support rigid mechanical pins.^[51] Environmental factors increasingly guide material decisions, with metals like steel, brass, and aluminum prized for their high recyclability—steel and aluminum can be recycled indefinitely without quality loss, reducing mining demands.^[60]^[61] alongside the use of recycled metals in production for sustainability.^[62]

Modern production methods

Contemporary pin manufacturing relies on automated wire processing systems that enable high-volume production with precision and efficiency. These systems typically begin with high-speed coil feeding, where steel or brass wire is uncoiled and fed into straightening rollers to ensure uniformity. The straightened wire is then cut to precise lengths using automated cutters, followed by pointing operations where one end is ground to a sharp tip via grinding wheels or CNC-controlled sharpeners. Heading, which forms the pin's head, is achieved through cold forming in multi-station presses or CNC machines that punch and shape the wire end, with some factories producing over 3 million pins per day.^[52]^[63] Quality control in modern pin production adheres to stringent standards, including ISO 9001 certification, which ensures consistent processes across facilities. Pins undergo heat treatment, such as annealing or tempering, to enhance tensile strength and durability, preventing bending or breakage during use. Finishing involves electroplating with nickel, chrome, or zinc to provide corrosion resistance and a smooth, polished surface, often followed by wax coating for lubrication in sewing applications. These steps are monitored through automated inspection systems that detect defects like burrs or dimensional inaccuracies, maintaining compliance with industry benchmarks.^[64]^[65]^[52] Recent innovations have introduced greater flexibility and sustainability to pin production. For custom or specialty pins, 3D printing enables rapid prototyping of unique designs or heads, allowing manufacturers to test variations without full tooling setups. Sustainable practices include waterless tumbling using magnetic pin finishers, which employ dry abrasive media to deburr and polish pins, reducing water consumption and wastewater generation compared to traditional wet methods. These advancements support eco-friendly operations while preserving product quality.^[66]^[67] The global pin industry is dominated by producers in China, which accounts for the majority of household pin output due to cost-effective automation and scale, alongside key U.S. manufacturers focusing on premium and specialty varieties. Basic straight pins can be produced at costs as low as $0.01 per unit in high-volume runs, influenced by raw material prices, automation levels, and plating options.^[68]^[52]^[69]

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Self Contained Aluminum Pin - Cox Manufacturing
The self-contained aluminum pin has a 2011T3 aluminum housing, a stainless steel spring, and a 12L14 steel pin, and is designed for limited space.<|separator|>
[58]
Plastic Safety Pins - Amazon.com
4.5 17K · 30-day returns70PCS Plastic Safety Pin 2inch Stainless Steel Pins No Rust, Safety Locking Baby Cloth Diaper Nappy Pins 2.2Inch · 100+ bought in past month.
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[PDF] Mechanical Properties of Steel - Pivot Pins
Mechanical Properties of Steel - Condition, Strength, Hardness, Machinability ... Tensile Strength psi Yield Strength psi. 43,000. 48,000. 44,000. 49,000. 47,000.
[60]
https://www.pinprosplus.com/post/are-enamel-pins-eco-friendly
[61]
Are Enamel Pins Eco-friendly? | PinProsPlus
Enamel pins are eco-friendly because they are both recyclable and reusable. Their eCommerce delivery model also saves energy and reduces carbon emissions.
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How to Make Your Lapel Pins More Eco-friendly?
Jun 19, 2024 · Recycled Metals: Opt for lapel pins made from recycled metals, which reduce the demand for newly mined resources and help minimize environmental ...
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Eco-Friendly Lapel Pin Manufacturing Processes
Organic Fibers and Recycled Plastics: In addition to metals, lapel pins can incorporate organic fibers or recycled plastics for backing or decorative elements.
[64]
https://groov-pin.com/quality/
[65]
Cotter Pin Making Machine(415) - Alibaba.com
High-capacity machines can produce between 1,000 to 5,000 cotter pins ... Key advantage: High-speed automation allows for thousands of pins per hour with minimal ...
[66]
Quality - Groov-Pin Corp.
Groov-Pin is committed to high quality, certified to ISO 9001:2015 and AS9100:2016, using high standards, and meeting customer-specific quality standards.
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Compliance | Bead Electronics
Bead Electronics is ISO 9001: 2015 Certified. This accreditation demonstrates Bead's commitment to producing the highest quality contact pins.
[68]
https://www.made-in-china.com/manufacturers/garment-pins.html
[69]
Magnetic Pin Finishers | Bel Air
Bel Air's Magnetic Pin Finisher provides precision burnishing results, making it an efficient alternative to manual polishing or traditional tumbling methods.Missing: waterless | Show results with:waterless
[70]
Garment Pins Suppliers - Made-in-China.com
Garment Pins Suppliers ; Ningbo Inunion Import and Export Co., Ltd. · 451 ㎡ · US$0.0018 ; Fuzhou Upinstar Import and Export Co., Ltd. · 358 ㎡ · US$0.35 ; Ningbo ...
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News - How Much Does it Cost to Produce a Pin?
But a bit of investigation reveals that $0.46 per pin refers to the smallest size enamel pin at a quantity of 10,000 pieces. So, unless you are a major ...