Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number HDH-4-398 found under Hook Hold Down Machine Tools by Churchill Corporation. The National Stock Number assigned to this part is 3460013337376, and the Federal Supply Class is 3460 Machine Tool Accessories. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like HDH-4-398.