Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 3B27-ST found under Battery Nonrechargeable by Greatbatch Sierra Inc. The National Stock Number assigned to this part is 6135013114929, 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 3B27-ST.