Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number YS3-4 found under Battery Storage by Yardney Technical Products Inc. The National Stock Number assigned to this part is 6140007145089, and the Federal Supply Class is 6140 Batteries Rechargeable. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like YS3-4.