Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number M3 DIN 137 A2 found under Washer Spring Tensi by Zelenda Machine And Tools Corp. The National Stock Number assigned to this part is 5310013696907, and the Federal Supply Class is 5310 Nuts And Washers. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like M3 DIN 137 A2.