Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 21PIN found under Pin Grooved Headless by H And L Tooth Company. The National Stock Number assigned to this part is 5315004842896, and the Federal Supply Class is 5315 Nails Machine Keys And Pins. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like 21PIN.