Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 401-004 found under Rule Machinists by Products Engineering Corporation. The National Stock Number assigned to this part is 5210002433351, and the Federal Supply Class is 5210 Measuring Tools Craftsmens. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like 401-004.