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Autolite 255DP Spark Plug
| Brand | Autolite 255DP |
|---|---|
| Resistance | 1 |
| Ground Electrode Tip Design | Tapered |
| Ground Electrode Core Material | Nickel |
| Electrical Terminal Type | Stud |
| Center Electrode Core Material | Copper |
| Center Electrode Tip Material | Nickel |
| Pre-Gap Size | 0.030 |
| Pre-Gap Size | 0.80 |
| Ground Electrode Quantity | 1 |
| Hex Size | 19 |
| Hex Size | 3/4" |
| Seat Type | Flat |
| Reach | 0.374 |
| Reach | 9.5 |
| Thread Diameter | 14.0 |
| Resistor Type | No |
| Center Electrode Design | Standard / regular |
| Ground Electrode Tip Material | Nickel |
| Insulator Material | Ceramic |
| Insulator Type | Short projection |
| Fits | — |
OE-style replacement. Built to match form, fit, and function for routine ignition service.
Copper-core design. Supports quick starts, smooth acceleration, and efficient combustion.
Standard service specs. Flat seat, 14.0 mm thread, 9.5 mm reach, and stud terminal.
Cross-references 5614036 for the same application. See all 1.
Overview
Autolite Copper Spark Plug 255DP is a direct-style ignition replacement built around OE form, fit, and function. It is intended for drivers who want reliable starting, steady acceleration, and efficient combustion from a copper-core plug.
This spark plug is a fitment-based replacement for a wide range of applications, including many foreign and domestic vehicles. The Autolite 255DP part number is also useful when cross-checking ignition service needs against OE-style specifications.
Key Features
- Copper center electrode core for responsive ignition performance.
- Nickel ground and center electrode tip materials for standard spark plug construction.
- 0.030 in. pre-gap for common service applications.
- Flat seat design with 14.0 mm thread diameter and 9.5 mm reach.
- Short projection ceramic insulator for conventional engine fitment.
- Stud terminal and 19 mm hex size for standard installation tooling.
Product Details
The Autolite Copper Spark Plug Display Pack is part of Autolite’s copper spark plug line, which focuses on OE-style replacement characteristics and broad aftermarket coverage. The 255DP spark plug uses a copper center electrode core, nickel electrode tips, and a resistor-free design to support consistent ignition performance in standard secondary ignition systems. The Autolite 255DP is a practical choice when replacing worn spark plugs in service intervals where original-style fit and function matter.
Autolite positions this spark plug as an OE-form replacement for many makes and models, and the brand’s aftermarket and OE supply background supports its use in routine ignition maintenance. For shoppers comparing ignition service parts, the Autolite 255DP offers a straightforward copper plug specification that aligns with common factory-style requirements.
Common Issues It Can Address
- Hard starting caused by worn spark plug electrodes.
- Rough idle from inconsistent spark delivery.
- Reduced throttle response from aged ignition components.
- Misfire symptoms related to plug wear or gap drift.
- Poor fuel economy tied to inefficient combustion.
Installation Notes
Verify thread diameter, reach, seat type, and terminal style before installation. Confirm the specified gap against the engine’s service requirements and inspect the ignition system for wear before replacing plugs. Use the Autolite 255DP only in applications that match the required spark plug specifications.
Quality Assurance
Autolite supplies ignition products to the automotive aftermarket and OE manufacturers, and this copper spark plug is built to OE form, fit, and function standards. The part number 255DP is a useful reference when matching service parts to the correct ignition specification.
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