Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number PH3491-3-1 found under Bolt Machine by Peck And Halellc. The National Stock Number assigned to this part is 5306015218273, 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 PH3491-3-1.