Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number T18221 found under Gage Parity Check by H And E Venture Llc. The National Stock Number assigned to this part is 5220002234350, and the Federal Supply Class is 5220 Inspection Gages And Precision Layout Tools. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like T18221.