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Different types of pins
A sewing pin
A safety pin
Push-pins in a cork board

A pin is a device, typically pointed, used for fastening objects or fabrics together. Pins can have the following sorts of body:

  • a shaft of a rigid inflexible material meant to be inserted in a slot, groove, or hole (as with pivots, hinges, and jigs)
  • a shaft connected to a head and ending in a sharp tip meant to pierce one or more pieces of soft materials like cloth or paper (the straight or push pin)
  • a single strip of a rigid but flexible material (e.g. a wire) whose length has been folded into parallel prongs in such fashion that the middle length of each curves towards the other so that, when anything is inserted between them, they act as a clamp (e.g. the bobby pin)
  • two strips of a rigid material bound together by a spring at one end so that, when the spring held open, one can insert some material between the prongs at the other end that, the spring allowed to close, then clamp the inserted material.[citation needed]

According to their function, pins can be made of metals (e.g. steel, copper, or brass), wood, or plastic.

History

[edit]
Bone and metal pins used to fasten clothing in the Bronze Age

Pins have been found at archaeological sites dating as early as the Paleolithic, made of bone and thorn, and at Neolithic, Celtic and Ancient Roman sites.[1] Neolithic sites are rich in wooden pins, and are still common through Elizabethan times.[2] Metal pins dating to the Bronze Age have been found in Asia, North Africa and Europe, like the hammer-headed pins from the kurgan burials in the northeastern Caucasus.[1]

Sewing and fashion pins

[edit]

The development of the pin closely paralleled that of its perforated counterpart, the needle. Archaeological evidence suggests that curved sewing pins have been used for over four thousand years. Originally, these were fashioned out of iron and bone by the Sumerians and were used to hold clothes together. Later, pins were also used to hold pages of books together by threading the needle through their top corner.[3]

Many later pins were made of brass, a relatively hard and ductile metal that became available during the Bronze Age. This development was followed by the use of steel which was much stronger but tended to rust when exposed to humid air. The development of inexpensive electroplating techniques allowed the steel to be plated with nickel. Nickel did not rust, but tended to flake off the steel in humid weather, again allowing it to rust. However, this took many months or even years to happen, and as nickel plated steel pins were usually used only temporarily to hold cloth in place prior to sewing, no further refinement has been considered necessary. However, some modern specialty pins are made out of rust-proof and very strong titanium.[4]

Production

[edit]
Bronze pins and casting mold, 15-17 century

A pinners guild was first established in London in 1356, spreading to other towns, but falling short of the quality produced by French pinmakers, discussed in the Art de l'épinglier (French: Art de l'épinglier, lit. 'Pin art') (1761) where Henri-Louis Duhamel du Monceau gives details about the division of labor used by French pinmakers:[5][6]

There is nobody who is not surprised of the small price of pins; but we shall be even more surprised, when we know how many different operations, most of them very delicate, are mandatory to make a good pin.

— Henri-Louis Duhamel du Monceau, Art de l'épinglier

Adam Smith described the manufacture of pins as part of his discussion about the division of labor in the Wealth of Nations.

John Ireland Howe invented a pin-making machine in 1832, and an improved machine in 1841; his Howe Manufacturing Company of Derby, Connecticut, used three machines to produce 72,000 pins per day in 1839.

Walter Hunt invented the safety pin by forming an eight-inch brass pin into a bent pin with a spring and guard. He sold the rights to his invention to pay a debt to a friend,[7] not knowing that he could have made millions of dollars.

Straight pins

[edit]
Pin type Typical size[Note 1] Typical length Features
Beading pins 14 7⁄8 in (22 mm) A wider-than-usual-head allows this pin to hold beads more easily.
T-pins 0.75 mm 1+1⁄4 in (32 mm) These pins have a head bent into a capital letter "T" to make it easier to grab with the finger tips.
Dressmaker pins 17-20 1+1⁄16 in (27 mm) The most common type of sewing pin, they are used for light- to medium-weight fabrics and may have either a small flat head or a round plastic one.
Pleating pins 17 1+1⁄16 in (27 mm) Considered "extra fine", they are used for pinning pleats and lightweight fabrics.
Appliqué pins 0.6 mm 3⁄4 in (19 mm) Pins have small round glass heads that are easy to work around; also, because the pins are comparatively short, they are less likely to "stick out" when holding small pieces of fabric against a larger one.
Bridal and lace pins 17 1+1⁄4 in (32 mm) These pins are made entirely of stainless steel and will not rust; they are used for fine and lightweight fabrics.
Patchwork pins 22 (0.5 mm) 1+7⁄16 in (37 mm) Pins have extra sharp tips for penetrating thick iron-on patches; their size and length also make them suitable for quilting; they have glass heads that will not melt if pressed in an iron.
Quilting pins 30 (0.6 mm) 1+7⁄8 in (48 mm) Quilting pins are exceptionally long and often have glass heads.
Silk pins 0.5 mm 1+7⁄16 in (37 mm) Silk pins are suitable for lightweight fabrics and traditionally have a glass head that will not melt when ironed.
Pearlized pins 24 1+1⁄2 in (38 mm) These have round plastic heads which have been painted (often in bright colors) to superficially resemble the appearance of pearls. Because the heads are plastic, there is a risk that they will melt if ironed at high temperatures.
Sequin pins 8 (0.5 mm) 1⁄2 in (13 mm) Their exceptionally short length makes these pins suitable for appliqué; a large flat head allows them to hold sequins in place. Used for permanently holding sequins to styrofoam forms such as Christmas ornaments.
Tidy pins - 1+1⁄2 in (38 mm) U-shaped pins with no head are used for holding slip covers and doilies in place; often made of brass so that they will not rust; also called fork or loose cover pins.
Hatpins - 8 in (20 cm) These are exceptionally long decorative pins used to hold a woman's hat in place.

General purpose pins

[edit]

The push pin was invented in 1900 by Edwin Moore[8] and quickly became a success. These pins are also called "map pins" and are distinguished by having an easy to grip head.

See also drawing pin or thumb tack.

Steel pins without heads

[edit]

Thin, hardened pins can be driven into wood with a hammer with the goal of not being seen.

Mechanical fasteners

[edit]

In engineering and machine design, a pin is a machine element that secures the position of two or more parts of a machine relative to each other. A large variety of types has been known for a long time; the most commonly used are solid cylindrical pins, solid tapered pins, groove pins, slotted spring pins and spirally coiled spring pins.

Explanatory notes

[edit]

References

[edit]

Further reading

[edit]
Revisions and contributorsEdit on WikipediaRead on Wikipedia

Pin

View on Grokipedia
from Grokipedia
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. 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. In everyday and domestic contexts, pins include straight pins for 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. These common pins, often produced from drawn steel wire, became widely available after mass-production techniques were patented in 1832 by John Ireland Howe, revolutionizing their accessibility and affordability. 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. In and mechanical applications, pins function as unthreaded fasteners to align, locate, or join components in assemblies, with types including 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. These industrial pins, commonly cylindrical or tapered and made from materials like or alloyed metals for durability and corrosion resistance, are inserted into pre-drilled holes to distribute loads and ensure structural integrity in machinery, vehicles, , and . Specialized variants, such as coiled spring pins invented in , provide compressible resilience for dynamic environments. Overall, pins remain essential across scales from personal accessories to heavy-duty due to their , versatility, and reliability.

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 around 3000 BCE, copper pins were crafted during the period to secure garments, as evidenced by archaeological finds from sites like Naqada and Ballas. These early implements, often simple straight pins, were supplemented by bone and wood variants for everyday use in holding together draped fabrics. By the time of , pins evolved into more sophisticated fibulae—brooch-like fasteners made of or other metals—that replaced simpler straight pins from the and Ages, allowing for secure attachment of togas, cloaks, and tunics while displaying status through decorative elements. 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. 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. 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. 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. 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. 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 , with the establishment of the first dedicated pin-making factory in , , by John Tilsley in 1626, which adopted Dutch techniques for drawing wire into rods suitable for cutting and heading. In , pin making had earlier roots in medieval guilds, such as the Paris pin makers' guild founded in 1268, but by the , production in regions like incorporated similar Dutch wire-drawing methods, enabling more efficient creation of pins from imported wire supplies. These developments marked the shift from hand-forged iron pins to standardized ones, laying the groundwork for larger-scale manufacturing amid growing demand from applications. During the , the division of labor became a cornerstone of pin production efficiency, as exemplified by Adam Smith's 1776 description in , where he detailed approximately 18 specialized operations—from and straightening to and heading—that allowed a small of 10 workers to produce up to 48,000 pins daily, compared to just one pin per worker without specialization. This approach, inspired by French descriptions from the of Sciences around 1675, emphasized task allocation by 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 . Standardization emerged as factories proliferated, with English production centering in , where water-powered mills began assisting wire processing by the late , though full mechanization awaited 19th-century patents. 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. 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. 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. 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. 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. 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.

Types of Household Pins

Straight pins

Straight pins, essential tools in 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 , allowing insertion into various fabrics without excessive damage, while the head is often made of or plastic to facilitate gripping and prevent burns during . The point is finely sharpened to pierce materials cleanly. Variations of straight pins are designed for specific sewing tasks, differing in length, thickness, and material properties. 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. pins feature longer shafts (up to 2.125 inches) and rust-resistant nickel-plated construction, ideal for securing multiple layers of fabric without corrosion during extended projects. pins are shorter and finer, often 0.75 to 1 inch in length, to minimize distortion when pinning delicate motifs for hand stitching. 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. The pins are then sharpened on grinding wheels and electroplated with nickel-sulfate for resistance and shine. Straight pins serve primarily for temporary holding of fabric layers during , such as aligning seams or marking patterns on material. To use them safely, insert pins perpendicular to fabric edges with heads facing outward for easy removal, reducing the risk of punctures; always remove pins before over them to avoid needle breakage or . Discarding bent or rusted pins prevents accidents, and a magnetic can help retrieve dropped ones without direct handling.

Safety and general purpose pins

The , 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 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. No. 6,281 on April 10, 1849, but sold the rights for just $400, underestimating its future widespread use. This design evolved from earlier straight pins employed in household sewing, incorporating the spring and clasp for enhanced 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. Variations of safety pins cater to specific needs, such as pins, which are larger (often size 2 or 3) and equipped with plastic-coated or locking heads to minimize risk and improve in baby care applications like securing cloth diapers. Jewelry safety pins, meanwhile, serve decorative purposes in and crafting, frequently adorned with beads, charms, or enamel for use as brooches, earrings, or accessories. Modern iterations often incorporate components in the clasp or head to enhance and prevent , particularly in or contexts. Safety pins have proven invaluable in emergency situations; during , they were standard in soldiers' 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 , holding patterns in place, or attaching items like hems or closures. 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 , 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.

Industrial and Specialty Pins

Headless steel pins

Headless 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 to enhance resistance, preventing in humid environments. Typical lengths vary from 1/4 inch (6.35 ) for fine craft applications to 1 inch (25.4 ) for general use, though specialized variants extend to 1.5 inches (38 ). Among the types, common headless steel pins serve versatile roles in crafts such as securing corsages and pattern modeling in , where their slim profile allows precise, temporary holds without marring delicate materials. Entomology pins represent a specialized subset, designed for mounting specimens and graded by from 000 (thinnest at 0.25 mm ) to 8 (up to 0.76 mm ), with all sizes sharing a standard length of approximately 38 mm for consistent display in collections. These entomology pins are often fabricated from to ensure durability and resistance to during long-term storage. 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. 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.

Mechanical fastening pins

Mechanical fastening pins are specialized fasteners designed for secure, load-bearing connections in applications, providing precise alignment, shear resistance, and pivot functionality in machinery, , 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. Cotter pins, featuring a split, wire-like design with one longer prong, resist vibration by expanding after insertion to lock parts in place. 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. These pins are commonly manufactured from hardened or for superior strength and wear resistance, with options in for corrosion-prone environments. Diameters range from 1/16 inch to 1 inch, accommodating various load requirements, while lengths vary incrementally to suit specific applications. 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. ASME B18.8.2 covers pins, defining tolerances for standard (0.0002 inch over nominal) and oversize series to support precise fits. In function, these pins primarily prevent shear forces by distributing loads across the and enable pivoting motion as hinges in mechanisms. pins, for instance, handle single shear loads up to 102,000 pounds for 1-inch diameters in . Cotter pins secure axles or rods against axial movement, while clevis pins form removable pivot joints in control linkages. Installation methods include press-fitting pins into reamed holes for interference fits, often requiring hole diameters 0.0005 to 0.0015 inch smaller than the pin for materials like or aluminum. Taper pins, a variant under the same standards, use a conical shape for self-locking insertion without pressing. 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. In modern contexts, they support critical applications in for component positioning in engines and airframes, and in automotive assemblies for suspension systems and drivetrains, where precision and resistance are paramount. Production techniques for these pins adapt basic and heading methods, scaled for high-precision grinding and heat treatment.

Materials and Manufacturing

Common materials used

Pins are primarily constructed from and its variants, selected based on the required balance of flexibility, strength, and durability for specific applications. Low-carbon , containing less than 0.30% carbon, is favored for its flexibility and formability in household items like pins, where without breaking is essential. High-carbon , with more than 0.60% carbon such as (>0.5% carbon), provides superior hardness and tensile strength for mechanical fastening pins that endure high stress and shear forces. , alloyed with and , offers excellent resistance, making it ideal for pins and industrial applications exposed to moisture or chemicals. Alternative materials expand pin functionality beyond steel's properties. , an of two-thirds and one-third , 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. Aluminum, particularly alloys like 7075, provides lightweight construction with good strength-to-weight ratio, commonly used in mechanical pins to reduce overall component mass without compromising performance. , often 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. is used for certain non-industrial pins, such as in crafts or historical applications, offering a natural, lightweight alternative but limited strength. Material selection hinges on key properties such as tensile strength, which for standard pins typically ranges around 60,000 psi to ensure they withstand pulling forces without deformation. enhances these properties; zinc on improves resistance for everyday pins, while or on adds aesthetic appeal and additional durability for decorative variants. These choices directly influence pin types, as low-carbon suits flexible straight pins for , whereas high-carbon variants support rigid mechanical pins. Environmental factors increasingly guide material decisions, with metals like , , and aluminum prized for their high recyclability— and be recycled indefinitely without quality loss, reducing demands. alongside the use of recycled metals in production for .

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 or 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 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. Quality control in modern pin production adheres to stringent standards, including ISO 9001 certification, which ensures consistent processes across facilities. Pins undergo , such as annealing or tempering, to enhance tensile strength and durability, preventing bending or breakage during use. Finishing involves with , chrome, or to provide resistance and a smooth, polished surface, often followed by coating for lubrication in applications. These steps are monitored through automated systems that detect defects like burrs or dimensional inaccuracies, maintaining compliance with industry benchmarks. Recent innovations have introduced greater flexibility and to pin production. For custom or specialty pins, enables 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. The global pin industry is dominated by producers in , which accounts for the majority of household pin output due to cost-effective 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 prices, levels, and plating options.

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  62. https://hipins.com/eco-friendly-lapel-pin-manufacturing-processes/
  63. https://www.alibaba.com/showroom/cotter-pin-making-machine.html
  64. https://groov-pin.com/quality/
  65. https://beadelectronics.com/capabilities/compliance
  66. https://www.formlabs.com/applications/rapid-prototyping/
  67. https://belairfinishing.com/mass-finishing/magnetic-pin-finisher-for-magnetic-parts/
  68. https://www.made-in-china.com/manufacturers/garment-pins.html
  69. https://www.lapelpinmaker.com/news/how-much-does-it-cost-to-produce-a-pin/
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