Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number MC4243V9-63 found under Bolt Machine by Mecair Aerospace Industries. The National Stock Number assigned to this part is 5306014636168, 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 MC4243V9-63.