Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 54N01 found under Gas Lens Insulator by Weldcraft Customer Service. The National Stock Number assigned to this part is 3431013521495, 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 54N01.