Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number JB20-403 found under Bearing Sleeve by La Crosse Trailer Corp. The National Stock Number assigned to this part is 3120003531406, and the Federal Supply Class is 3120 Bearings Plain Unmounted. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like JB20-403.