Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 40B 18X.982 found under Screw Sprocket by Dt Marine Products Inc. The National Stock Number assigned to this part is 5340015147820, 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 40B 18X.982.