Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 81Z53 found under Cup Torch by Welding Nozzle Intl Inc. The National Stock Number assigned to this part is 3431003981462, 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 81Z53.