BG SPARK PLUGS
BG’s Iridium Electrode Spark Plugs Are Designed To Run Cooler, Last Longer, For Today’s Clean Burn Engines. . .
- Iridium electrodes resist erosion at high temperatures.
- Exceptional performance under the most demanding operating conditions.
- Models available to meet the requirements of most industrial engines.
Consistent long-term performance has established BG’s reputation for engineering excellence.
| Plug Type | Thread Size | Thread Reach | Model | Heat Range | Shielding Thread | Resistor | Installed Height | Hex Size | Std. Gap |
Unshielded  |
7/8″-18 | 5/8″ | RB212-1 | Medium | – | Yes | 2-11/32″ | 15/16″ | .015″ |
| 5/8″ | RB105-1 | Cold | – | Yes | 3-7/16″ | 15/16″ | .015″ | ||
| 1″ | RB114-1 | Cold | – | Yes | 3-1/16″ | 15/16″ | .015″ | ||
| 1/2″ | RB485-1 | Medium | – | Yes | 2-15/32″ | 7/8″ | .015″ | ||
Shielded  |
7/8″-18 | 5/8″ | RB118SD | Cold | 3/4″-20 | Yes | 2-3/32″ | 15/16″ | .015″ |
| 1/2″ | RBH485SD | Cold | 3/4″-20 | Yes | 2-1/4″ | 7/8″ | .015″ | ||
| 13/16″ | BG341-1 | Medium | 3/4″-20 | Yes | 2-1/2″ | 7/8″ | .014″ |
All models have two iridium ground electrodes except:
– Model BG341-1 has a massive nickel electrode (3 prongs).
(BG Spark Plugs continued on page 51)