Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number H4T20B found under Spacer by Aurora Pump. The National Stock Number assigned to this part is 5365004292920, and the Federal Supply Class is 5365 Bushings Rings Shims And Spacers. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like H4T20B.