Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 621-0154 found under Tip Contact by M K Products Inc. The National Stock Number assigned to this part is 3431011691332, and the Federal Supply Class is 3431 Electric Arc Welding Equipment. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like 621-0154.