Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 861-90311 found under Anti Two Block Wt by North American Crane And Equipment. The National Stock Number assigned to this part is 3940014794634, and the Federal Supply Class is 3940 Blocks Tackle Rigging And Slings. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like 861-90311.