Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 138 02 057 found under Semiconductor Device Set by Hickok Incorporated. The National Stock Number assigned to this part is 5961002226843, 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 138 02 057.