Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number SG3870 found under Sleeve Clutch by American Standard Inc. The National Stock Number assigned to this part is 2520003525511, and the Federal Supply Class is 2520 Vehicular Power Transmission Components. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like SG3870.