Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 18D-5 found under Cylinder Assembly A by Clippard Instrument Laboratory Inc. The National Stock Number assigned to this part is 3040013303265, and the Federal Supply Class is 3040 Miscellaneous Power Transmission Equipment. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like 18D-5.