Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number B81-0439-1 found under Indexing Pin Maste by Grimes Aerospace Company. The National Stock Number assigned to this part is 6110008245586, and the Federal Supply Class is 6110 Electrical Control Equipment. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like B81-0439-1.