Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number LIBERTY PEN TY5STEFN3IP1 found under Pen And Pencil by National Industries For The Blind. The National Stock Number assigned to this part is 7520014393388, and the Federal Supply Class is . Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like LIBERTY PEN TY5STEFN3IP1.