Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number BM 1250 ITEM 42 found under Clamp Lube by Horsburgh And Scott Co The. The National Stock Number assigned to this part is 5342012548885, and the Federal Supply Class is . Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like BM 1250 ITEM 42.