The Spark Plug, cataloged under National Stock Number 2925-00-294-3890, 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 14 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 | 2925-00-294-3890 |
| Primary Part Number | RB27R |
| Item Name | Spark Plug |
| FSC / FSG | 2925 / 29 — Engine Electrical System Components, Aircraft Prime Moving |
| Manufacturer | The B G Service Company, Inc. |
| Status | ACTIVE |
| Width Across Flats | 0.820 INCHES MINIMUM AND 0.878 INCHES MAXIMUM IN |
| Top to Terminal Contact Distance | 1.000 INCHES MINIMUM AND 1.050 INCHES MAXIMUM IN |
| Height Above Mounting Surface | 2.190 INCHES MINIMUM AND 2.310 INCHES MAXIMUM 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 | 0.802 INCHES MINIMUM AND 0.812 INCHES MAXIMUM IN |
| Seat Major Diameter | 0.555 INCHES MINIMUM AND 0.565 INCHES MAXIMUM IN |
| Shield Thread Length | 0.250 INCHES NOMINAL IN |
| Top to Shield Thread Distance | 0.120 INCHES NOMINAL IN |
| Terminal Sleeve Inside Diameter | 0.378 INCHES MINIMUM AND 0.383 INCHES MAXIMUM IN |
| Barrel Inside Diameter | 0.469 INCHES NOMINAL 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 |
| Part Number | Manufacturer |
|---|---|
| RB27R PRIMARY | The B G Service Company, Inc. (USA) |
NSN 2925-00-294-3890 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 2925-00-294-3890 has 1 manufacturer part number on file: RB27R (The B G Service Company, Inc.).
Key specifications for RB27R: Width Across Flats: 0.820 INCHES MINIMUM AND 0.878 INCHES MAXIMUM IN; Top to Terminal Contact Distance: 1.000 INCHES MINIMUM AND 1.050 INCHES MAXIMUM IN; Height Above Mounting Surface: 2.190 INCHES MINIMUM AND 2.310 INCHES MAXIMUM IN; Usage Design: AIRCRAFT ENGINE. 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.