Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 70057-12 found under Fastener Turn Lock by Plastics Research Corporation. The National Stock Number assigned to this part is 5325012001126, 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 70057-12.