Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 3B4419 found under Bolt Machine by Pettibone Westrac. The National Stock Number assigned to this part is 5306002638979, 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 3B4419.