Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number PX-538 found under Shaft Straight by The Technical Material Corporation. The National Stock Number assigned to this part is 3040000607929, 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 PX-538.