Model: 221289N8
Shouldered And Recessed WasherProperties:
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.
Part 221289N8 NSN 5310-00-285-8478
Material Classification
Hazardous material, precious metals, criticality, enviroment, and electrostatic discharge indicatorsFreight Classification
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Schedule B and Export
- Schedule B: 7616108000
- SITC: 69440
- End Use: Finished metal shapes
- NAICS: 332722
- USDA: 1
Freight Class: Cotters, cotter-pins, washers and similar articles, of aluminum
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