Autolite 411 Spark Plug

Autolite 411 Copper Spark Plug Overview

The Autolite 411 is a copper non-resistor spark plug built for quick starts, steady idle quality, and smooth acceleration. It follows OE-style form, fit, and function for a wide range of foreign and domestic vehicles, including common Honda Civic and Toyota Corolla applications where a standard copper plug is specified.

Key Features

• Copper center electrode core for reliable ignition performance
• Non-resistor design for applications that call for a resistor-free plug
• Nickel center and ground electrode tip materials for consistent spark delivery
• Tapered ground electrode tip design for efficient flame kernel exposure
• 0.025 in. pre-gap size for OE-style setup
• 14 mm thread diameter, 0.500 in. reach, and flat seat configuration
• Ceramic short insulator with removable nut terminal

Detailed Description

Autolite Copper Non-Resistor Spark Plug 411 is engineered as an OE-style replacement for engines that specify a conventional copper plug. The copper core helps promote dependable ignition response, while the nickel electrode materials support stable spark transfer under normal operating conditions. With a 13/16 in. hex, flat seat, and 0.500 in. reach, this plug is built to match common factory specifications across many makes and models. If you are servicing a Honda Civic or Toyota Corolla and the engine calls for a standard copper, non-resistor plug, Autolite 411 provides the correct style of replacement.

This part cross-references DENSO Auto Parts 4037 for the same application.

What It Helps Address

• Hard starting caused by worn or fouled spark plugs
• Rough idle from inconsistent spark delivery
• Reduced throttle response from degraded ignition performance
• Misfire symptoms related to plug wear or incorrect plug type
• Fuel economy loss tied to weak combustion efficiency

Installation Notes and Tips

Verify the engine’s required plug type, thread diameter, reach, seat style, and gap before installation. Autolite 411 is pre-gapped at 0.025 in., but final gap should always be checked against the vehicle service specification. Use the removable nut terminal only as required by the ignition lead or coil connection style, and confirm the plug is tightened to the manufacturer’s torque specification.

Quality Assurance

Autolite supplies ignition products to the automotive aftermarket and original equipment manufacturers, with a focus on OE form, fit, and function. Part number 411 is built to meet the needs of standard copper spark plug applications and is backed by Autolite’s established ignition product manufacturing experience.