Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number JB1-3 16X12 found under Pin Spring by Flowserve Corporation. The National Stock Number assigned to this part is 5315013003739, 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 JB1-3 16X12.