The Spark Plug, cataloged under National Stock Number 2925-00-690-8763, is classified within Federal Supply Class 2925 (Engine Electrical System Components, Aircraft Prime Moving) of the Engine Accessories group. The manufacturer of record is The B G Service Company, Inc.. Government technical data includes 15 specifications, cited from the U.S. Government catalog. The record lists 1 manufacturer part number for this item, enabling identification through both NSN and commercial part number lookups. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 2925-00-690-8763 |
| Primary Part Number | RB39R1 |
| Item Name | Spark Plug |
| FSC / FSG | 2925 / 29 — Engine Electrical System Components, Aircraft Prime Moving |
| Manufacturer | The B G Service Company, Inc. |
| Status | ACTIVE |
| Pressure Rating | 340.0 POUNDS PER SQUARE INCH (PSI) NOMINAL MEAN EFFECTIVE LBS |
| Width Across Flats | 0.875 INCHES NOMINAL IN |
| Top to Terminal Contact Distance | 1.531 INCHES NOMINAL IN |
| Height Above Mounting Surface | 2.500 INCHES NOMINAL IN |
| Usage Design | AIRCRAFT ENGINE |
| Electrode Style | TWO FLAT GROUND ELECTRODE |
| Body Style | ELECTRICALLY SHIELDED, PARTIAL INSULATOR, GASKET SEAT |
| DC Resistance Rating in Ohms | 3000.0 NOMINAL |
| Reach Length | 0.750 INCHES NOMINAL IN |
| Seat Major Diameter | 0.960 INCHES MAXIMUM IN |
| Shield Thread Length | 0.375 INCHES NOMINAL IN |
| Top to Shield Thread Distance | 0.125 INCHES NOMINAL IN |
| Terminal Sleeve Inside Diameter | 0.375 INCHES NOMINAL IN |
| Barrel Inside Diameter | 0.560 INCHES NOMINAL IN |
| Thread Size and Series/type Designator | 3/4-20 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 |
| Part Number | Manufacturer |
|---|---|
| RB39R1 PRIMARY | The B G Service Company, Inc. (USA) |
NSN 2925-00-690-8763 is a Spark Plug, manufactured by The B G Service Company, Inc., classified under FSC 2925, Engine Electrical System Components, Aircraft Prime Moving. Status: active.
NSN 2925-00-690-8763 has 1 manufacturer part number on file: RB39R1 (The B G Service Company, Inc.).
Key specifications for RB39R1: Pressure Rating: 340.0 POUNDS PER SQUARE INCH (PSI) NOMINAL MEAN EFFECTIVE LBS; Width Across Flats: 0.875 INCHES NOMINAL IN; Top to Terminal Contact Distance: 1.531 INCHES NOMINAL IN; Height Above Mounting Surface: 2.500 INCHES NOMINAL IN. 15 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.