21139AS: PISTON,INTERNAL COMBUSTION ENGIN.
PISTON,INTERNAL COMBUSTION ENGIN. Key specifications include weight: 36.000 OUNCES OZ, diameter: 4.250 INCHES NOMINAL IN, material: ALUMINUM, head_style: HUMP, oil_groove: NOT INCLUDED, skirt_type: SOLID. This part is cataloged in the U.S.
Government catalog under NSN 2805-00-374-4989, indicating validated use in U.S. government and defense logistics supply chains. Available through authorized enterprise resellers and TPM (Third Party Maintenance) channels.
Verify compatibility with your specific system configuration before ordering.
| weight | 36.000 OUNCES OZ |
| diameter | 4.250 INCHES NOMINAL IN |
| material | ALUMINUM |
| head_style | HUMP |
| oil_groove | NOT INCLUDED |
| skirt_type | SOLID |
| carbon_groove | NOT INCLUDED |
| overall_height | 4.000 INCHES NOMINAL IN |
| surface_finish | FINISHED |
| pin_hole_bushing | NOT INCLUDED |
| pinhole_diameter | 1.3125 INCHES NOMINAL IN |
| ring_groove_width | 0.2515 INCHES NOMINAL THIRD RING IN |
| NSN | 2805-00-374-4989 |
| OVERALL HEIGHT | 4.000 INCHES NOMINAL IN |
| FSC APPLICATION DATA | ENGINE,GASOLINE,NONAIRCRAFT |
| CARBON GROOVE | NOT INCLUDED |
| RING GROOVE WIDTH | 0.0975 INCHES NOMINAL FIRST RING IN |
| RING GROOVE WIDTH | 0.1275 INCHES NOMINAL SECOND RING IN |
| RING GROOVE WIDTH | 0.2515 INCHES NOMINAL THIRD RING IN |
| DISTANCE BETWEEN PIN BOSSES | 2.469 INCHES NOMINAL IN |
| RETAINING RING GROOVE | INCLUDED |
| SURFACE FINISH | FINISHED |
| DIAMETER | 4.250 INCHES NOMINAL IN |
No substitute or cross-reference records for this part.