Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 975-135 PC 8 found under Spring Helical Exte by Insinger Machine Company The. The National Stock Number assigned to this part is 5360014487175, and the Federal Supply Class is 5360 Coil Flat Leaf And Wire Springs. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like 975-135 PC 8.