Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 4172 found under Pin Grooved Headles by New Haven Mfg Corp. The National Stock Number assigned to this part is 5315008099022, 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 4172.