Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 6B-12X55 found under Bolt Machine by C Tech Industries Inc. The National Stock Number assigned to this part is 5306012873478, 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 6B-12X55.