Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 1B1-1025 found under Bearing Sleeve by Konica Business Machines U S A Inc. The National Stock Number assigned to this part is 3120009109709, 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 1B1-1025.