Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 5 16 INCH-18UNC-2AX1 INCH found under Bolt Machine by Cardinal Fastener And Specialty Co. The National Stock Number assigned to this part is 5306005434405, and the Federal Supply Class is 5306 Bolts. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like 5 16 INCH-18UNC-2AX1 INCH.