Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number EM81-10 found under by Empire Level Mfg Co. The National Stock Number assigned to this part is 5210016665826, 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 EM81-10.