Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number B1900 found under Shackle by Patterson Medical Supplyinc. The National Stock Number assigned to this part is 4030016181806, and the Federal Supply Class is 4030 Fittings For Rope Cable And Chain. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like B1900.