Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number MR1S1-500 found under Roll Roller Tube Expander by Indresco Inc. The National Stock Number assigned to this part is 3456000129700, and the Federal Supply Class is 3456 Cutting And Forming Tools For Secondary Metalworking Machinery. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like MR1S1-500.