Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number W12031UF found under Bearing Sleeve by Cleveland Gear Company Inc. The National Stock Number assigned to this part is 3120014493545, 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 W12031UF.