Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 2B48SDS found under Pulley Sash by Martin Sprocket And Gear Inc. The National Stock Number assigned to this part is 5340013911559, and the Federal Supply Class is 5340 Hardware Commercial. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like 2B48SDS.