Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number ASME B18.2.1 found under Bolt Machine by American Society Of Mechanical. The National Stock Number assigned to this part is 5306011951579, 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 ASME B18.2.1.