Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number ST5 16-18X3 4-4601 found under Boltmachine by A P M Hexseal Corporation. The National Stock Number assigned to this part is 5306016793924, 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 ST5 16-18X3 4-4601.