Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number MR1921-05 29 05-11U found under Rack Electrical Equ by Hardigg Industries Inc. The National Stock Number assigned to this part is 5975016334896, and the Federal Supply Class is 5975 Electrical Hardware And Supplies. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like MR1921-05 29 05-11U.