Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number MIL-B-18 found under Battery Nonrecharge by National Aerospace Standards. The National Stock Number assigned to this part is 6135001000423, and the Federal Supply Class is 6135 Batteries Nonrechargeable. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like MIL-B-18.