Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number A51G20517-1 found under Bolt Fluid Passage by Howe Machine And Tool Corp. The National Stock Number assigned to this part is 4730000044746, and the Federal Supply Class is 4730 Hose Pipe Tube Lubrication And Railing Fittings. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like A51G20517-1.