Model: 257B
Piston RingProperties:
A circular, single or multipiece item, metallic or nonmetallic in composition, designed to be fitted in a circumferential groove in a piston and to spring outward against the cylinder wall to function as a seal or wiper. It is supplied in various cross-sectional shapes and is cut through at one point to allow for installation in the piston ring groove. It may include an expander. Excludes packing, preformed; retainer, oil seal; retainer, packing; ring, retaining; ring wiper; and seal ring, metal.
Part 257B NSN 4310-00-173-5268
Material Classification
Hazardous material, precious metals, criticality, enviroment, and electrostatic discharge indicatorsPackaging & Shipping
Freight Classification
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Schedule B and Export
- Schedule B: 8414902095
- SITC: 74380
- End Use: Industrial engines
- NAICS: 333912
- USDA: 1
Freight Class: Parts nesoi, of compressors other than refrigerating and air conditioning compressors
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