Boss end hexagon in shape; has counterbore
A washer, round in shape, having a centrally located hole. One bearing surface is flat, the other surface is in the form of a raised shoulder (boss) having a flat bearing surface. Either or both of the bearing surfaces must be broken by a counterbore, countersink, or similar shaped recess. The thickness of the shoulder (boss) must not exceed 25 percent of the shoulder (boss) diameter. For items having a shoulder (boss) of greater thickness, use bearing, sleeve; bushing, sleeve; or spacer, sleeve. Excludes insulator, washer and thrust type washers.
Classification: Cotters, cotter-pins, washers and similar articles, of aluminum
NSN 5925-00-172-1678
NSN 6145-01-023-1526
NSN 5990-01-588-3999
NSN 5895-01-076-4106
NSN 6220-01-602-2561
NSN 6610-01-130-8885
NSN 6320-01-519-8767
NSN 6135-00-985-7887
NSN 6150-01-188-8232
NSN 5935-00-899-5364
NSN 5905-00-177-7833
NSN 6650-01-242-2508