| Item Name | Ring Piston |
| Federal Supply Group (FSG) | Engine Accessories |
| Federal Supply Class (FSC) | 2990 Miscellaneous Engine Accessories Nonaircraft |
| National Item Identification Number (NIIN) | 00-422-1979 (004221979) |
| NCB Code | USA (00) |
| Manufacturer | Parker Hannifin Corporation |
| MRC | Criteria | Characteristic |
|---|---|---|
| AAGR | CROSS-SECTIONAL SHAPE STYLE | PLAIN RECTANGULAR, STRAIGHT FACE |
| ACXD | RING STYLE | CONCENTRIC |
| ACXF | RADIAL WALL THICKNESS | 0.0940 INCHES NOMINAL |
| ACXJ | OVERALL WIDTH | 0.1250 INCHES NOMINAL |
| ACXZ | STANDARD BORE DIAMETER | 2.500 INCHES |
| ADTE | JOINT STYLE | VERTICAL JOINT |
| MATT | MATERIAL | COPPER ALLOY OVERALL |
| Components Related to NSN - 2990-00-422-1979, 2990004221979 | ||||
| 2920-00-847-0637 (2920008470637) | 2930-01-294-1619 (2930012941619) | 2915-01-258-1569 (2915012581569) | 2910-00-036-0233 (2910000360233) | |
| 2945-00-700-1236 (2945007001236) | 2915-01-126-7685 (2915011267685) | 2990-01-662-8157 (2990016628157) | 2990-01-165-8232 (2990011658232) | |
| 2910-01-119-0946 (2910011190946) | 2990-01-699-1285 (2990016991285) | 2995-00-467-6487 (2995004676487) | 2925-00-112-9175 (2925001129175) | |
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