Linch pin: 
DIN11023, linch pin, Wire Lock Pins, lock pin
Pins Material: Carbon Steel / Stainless Steel
Wires Material: Spring Steel
Surface treatment: Yellow zinc plated, zinc plated, plain,
Reference M range: M4.5-M12
Reference Length: 30mm-90mm
All size or produce according with your request

Linch pins are commonly used in the agricultural industry for securing implements onto the three point hitch of a. Linch pins may also be used in place of an for securing hitch pins

The safety pin is a variation of the regular pin which includes a simple spring mechanism and a clasp. The clasp serves two purposes: to form a closed loop thereby properly fastening the pin to whatever it is applied to, and to cover the end of the pin to protect the user from the sharp point.

Safety pins are commonly used to fasten pieces of fabric or clothing together. Safety pins, or more usually a special version with an extra safe cover, called a nappy pin, or loincloth pin, are widely used to fasten cloth diapers (nappies), or modern loincloths, as the safety clasp, while remaining ingestion hazard,[1] prevents the baby girl or boy from being jabbed. Similarly, they can be used to patch torn or damaged clothing. Safety pins can also be used as an accessory in jewelry, like earrings, chains, and wristbands. Sometimes they are used to attach an embroidered patch. Size 3 is often used in quilting and may be labelled for purchase as a "quilting pin". Size 4 and larger may be called "blanket pins" and deemed acceptable as kilt pins for informal dress, depending upon design and appearance.

The sharpened pin, that is attached to a coiled wire is connected with a cap that is hooked at the end of the wire. Pushing the pin into the opening of the cap secures the safety of the pin, and the clasp is the closed.