Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number AS28431 found under Wrench Torque by Society Of Automotive Engineers Inc. The National Stock Number assigned to this part is 5120000013733, and the Federal Supply Class is 5120 Hand Tools Nonedged Nonpowered. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like AS28431.