Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number W99K1958 found under Grinding Machine Utility by Sears Roebuck And Co. The National Stock Number assigned to this part is 3415009051943, and the Federal Supply Class is 3415 Grinding Machines. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like W99K1958.