Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 3031B found under Bolt Externally Rel by Dresser Rand Co. The National Stock Number assigned to this part is 5306003933634, 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 3031B.