Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 4K32 found under Pin Locking by Caterpillar Inc. The National Stock Number assigned to this part is 5315010271251, 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 4K32.