A pin is a device used for fastening objects or material together. Pins often have two components: a long body and sharp tip made of steel, or occasionally copper or brass, and a larger head often made of plastic. The sharpened body penetrates the material, while the larger head provides a driving surface. It is formed by drawing out a thin wire, sharpening the tip, and adding a head. Nails are related, but are typically larger. In machines and engineering, pins are commonly used as pivots, hinges, shafts, jigs, and fixtures to locate or hold parts.
|Pin type||Typical size||Typical length|
|Beading pins||14||7⁄8 in (22 mm)|
|T-pins||0.75 mm||1 1⁄4 in (32 mm)|
|Dressmaker pins||17-20||1 1⁄16 in (27 mm)|
|Pleating pins||17||1 1⁄16 in (27 mm)|
|Applique pins||0.6 mm||3⁄4 in (19 mm)|
|Bridal and lace pins||17||1 1⁄4 in (32 mm)|
|Patchwork pins||22 (0.5 mm)||1 7⁄16 in (37 mm)|
|Quilting pins||30 (0.6 mm)||1 7⁄8 in (48 mm)|
|Silk pins||0.5 mm||1 7⁄16 in (37 mm)|
|Pearlized pins||24||1 1⁄2 in (38 mm)|
|Sequin pins||8 (0.5 mm)||1⁄2 in (13 mm)|
|Tidy pins||-||1 1⁄2 in (38 mm)|
|Hatpins||-||8 in (20 cm)|
Above info is from the reference.