The Spark Plug, cataloged under National Stock Number 2925-00-142-8731, is classified within Federal Supply Class 2925 (Engine Electrical System Components, Aircraft Prime Moving) of the Engine Accessories group. Government technical data includes 14 specifications, cited from the U.S. Government catalog. 3 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 1 item shares a part number with this NSN in the catalog (possible match — not a government interchangeability claim). Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 2925-00-142-8731 |
| Item Name | Spark Plug |
| FSC / FSG | 2925 / 29 — Engine Electrical System Components, Aircraft Prime Moving |
| Status | ACTIVE |
| Pressure Rating | 340.0 POUNDS PER SQUARE INCH (PSI) NOMINAL MEAN EFFECTIVE LBS |
| Width Across Flats | 0.870 INCHES MINIMUM AND 0.878 INCHES MAXIMUM IN |
| Top to Terminal Contact Distance | 1.000 INCHES MINIMUM AND 1.070 INCHES MAXIMUM IN |
| Height Above Mounting Surface | 2.188 INCHES MINIMUM AND 2.312 INCHES MAXIMUM IN |
| Usage Design | AIRCRAFT ENGINE |
| Electrode Style | TWO FLAT GROUND ELECTRODE |
| Body Style | ELECTRICALLY SHIELDED, FULL INSULATOR, GASKET SEAT |
| DC Resistance Rating in Ohms | 1500.0 NOMINAL |
| Reach Length | 0.792 INCHES MINIMUM AND 0.812 INCHES MAXIMUM IN |
| Seat Major Diameter | 0.960 INCHES NOMINAL IN |
| Shield Thread Length | 0.375 INCHES NOMINAL IN |
| Top to Shield Thread Distance | 0.105 INCHES MINIMUM AND 0.145 INCHES MAXIMUM IN |
| Terminal Sleeve Inside Diameter | 0.378 INCHES MINIMUM AND 0.388 INCHES MAXIMUM IN |
| Thread Size and Series/type Designator | 5/8-24 UNEF SHIELD |
| Acquisition Status | ACTIVE |
| DEMIL Code | DEMIL A — No Demilitarization Required |
| Hazard | No hazard code in the DLA record (HMIC N) |
| Criticality Code | X |
| Reference | Meaning |
|---|---|
| AC181 | 5/9 Secondary reference General Motors Corp |
| AC181 | 3/9 Design control — primary reference General Motors Llc Dba General Motors |
| AC181 | C/1 Advisory reference — outside the item-of-supply concept General Motors Llc Dba General Motors Llc |
NSN 2925-00-142-8731 is a Spark Plug, classified under FSC 2925, Engine Electrical System Components, Aircraft Prime Moving. Status: active.
1 possible match (shared part number, not a government interchangeability claim): 6850-00-656-1291. Verify interchangeability with system specifications before substitution.
Key specifications for 2925-00-142-8731: Pressure Rating: 340.0 POUNDS PER SQUARE INCH (PSI) NOMINAL MEAN EFFECTIVE LBS; Width Across Flats: 0.870 INCHES MINIMUM AND 0.878 INCHES MAXIMUM IN; Top to Terminal Contact Distance: 1.000 INCHES MINIMUM AND 1.070 INCHES MAXIMUM IN; Height Above Mounting Surface: 2.188 INCHES MINIMUM AND 2.312 INCHES MAXIMUM IN. 14 specifications are documented in the U.S. Government catalog.
No hazard code in the DLA record (HMIC N). Hazard information on this page is shown exactly as it appears in the DLA record.
U.S. Government catalog: edition PUBLOGDVD v12.0.0 (OCT 2026), edition date 2026-10-01, retrieved 2026-10-16.
U.S. Government catalog: edition PUBLOGDVD v12.0.0 (OCT 2026), edition date 2026-10-01, retrieved 2026-10-18.