Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number PB31-2SS found under Lockspring Turnlock Fastener by Dfci Solutions Inc. The National Stock Number assigned to this part is 5325007803430, and the Federal Supply Class is 5325 Fastening Devices. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like PB31-2SS.