Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number S194F428-12 found under Bearing Sleeve by Alcoa Fastening Systems Ltd. The National Stock Number assigned to this part is 3120010285151, 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 S194F428-12.