Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 87131-320 found under Raceway Tee Fitting by Aar Manufacturing Inc. The National Stock Number assigned to this part is 5975015814396, 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 87131-320.