Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 11-5531 found under Semiconductor Device Assembly by Ballard Commercial Industries Inc. The National Stock Number assigned to this part is 5961014506429, and the Federal Supply Class is 5961 Semiconductor Devices And Associated Hardware. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like 11-5531.