Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 621-0001 found under Tip Contact Welding by M K Products Inc. The National Stock Number assigned to this part is 3433013057937, and the Federal Supply Class is 3433 Gas Welding Heat Cutting And Metalizing Equipment. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like 621-0001.