---
product_id: 14819832
title: "Autolite 405 Copper Resistor Automotive Replacement Spark Plug (1 Pack)"
brand: "autolite iridium ultra"
price: "£8.24"
currency: GBP
in_stock: true
reviews_count: 9
url: https://www.desertcart.co.uk/products/14819832-autolite-405-copper-resistor-automotive-replacement-spark-plug-1-pack
store_origin: GB
region: United Kingdom
---

# Boosts fuel efficiency & smooth acceleration Full copper core for max thermal conductivity Leak-proof copper-glass seal for durability Autolite 405 Copper Resistor Automotive Replacement Spark Plug (1 Pack)

**Brand:** autolite iridium ultra
**Price:** £8.24
**Availability:** ✅ In Stock

## Summary

> ⚡ Ignite your drive with Autolite’s copper core spark — where power meets precision!

## Quick Answers

- **What is this?** Autolite 405 Copper Resistor Automotive Replacement Spark Plug (1 Pack) by autolite iridium ultra
- **How much does it cost?** £8.24 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.co.uk](https://www.desertcart.co.uk/products/14819832-autolite-405-copper-resistor-automotive-replacement-spark-plug-1-pack)

## Best For

- autolite iridium ultra enthusiasts

## Why This Product

- Trusted autolite iridium ultra brand quality
- Free international shipping included
- Worldwide delivery with tracking
- 15-day hassle-free returns

## Key Features

- • **Unmatched Durability:** Heat-fused internal seal and copper-glass bonding create a 100% leak-proof design that stands the test of time.
- • **Precision Engineering:** Cold-formed steel shell with precision rolled threads and multi-rib insulator reduces misfires and radio frequency interference.
- • **Optimized Fuel Economy:** Engineered to deliver quicker starts and smoother acceleration, helping you save on fuel without sacrificing power.
- • **Trusted Legacy Since 1936:** Backed by decades of innovation, Autolite spark plugs combine performance and reliability for the discerning driver.
- • **Maximum Thermal Performance:** Full copper core electrode ensures superior heat dissipation for consistent spark power in all driving conditions.

## Overview

The Autolite 405 Copper Resistor Spark Plug features a full copper core electrode for enhanced thermal conductivity, a leak-proof copper-glass seal for durability, and a resistor to reduce radio frequency interference. Designed for quick starts, improved fuel efficiency, and smooth acceleration, this vehicle-specific spark plug combines precision engineering with a trusted legacy dating back to 1936.

## Description

Autolite Copper Core Spark Plugs deliver quick starts, good fuel economy, and smooth acceleration. The copper-glass seal bonds insulator and terminal post center electrode together to ensure full required voltage at spark gap, creating a gas-tight seal that is 100 percent leak-proof. Copper Core spark plugs feature a cold-formed steel shell and precision rolled threads, and a one-piece terminal post that adds strength. The multi-rib insulator reduces the danger of "flash-over" to prevent misfires, and the resistor reduces radio frequency interference (RFI) and electrode erosion. The full copper core electrode provides better performance in all conditions. Autolite Copper Core plugs are your industry standard.

Review: Great product! Worked like a charm - Great product! Worked like a charm.
Review: Only One Plug - Shows pack of four, but only one plug.

## Features

- MAXIMUM PERFORMANCE: Every Copper Spark Plug has a full copper core electrode which provides higher thermal conductivity for better performance in all conditions
- IMPROVED DURABILITY: All Autolite spark plugs are Leak proof and come with a heat fused internal seal for long lasting durability
- CONSTRUCTION: These replacement spark plugs have a copper-glass seal which bonds the insulator and the terminal post center electrode together
- FUEL EFFICIENCY: The Autolite copper automotive replacement spark plug are guaranteed to deliver quick starts, better fuel economy and smooth acceleration
- AUTOLITE ADVANTAGE: Since 1936, Autolite has been a trusted leader and innovator in spark plug technology. You can count on our copper plugs for performance and value, backed by decades of experience and passion

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B000C1WB9K |
| Automotive Fit Type | Vehicle Specific Fit |
| Best Sellers Rank | #572,535 in Automotive ( See Top 100 in Automotive ) #3,162 in Automotive Replacement Spark Plugs |
| Brand Name | Autolite Iridium Ultra |
| Compatible with Vehicle Type | Car, Truck |
| Core Material | Copper |
| Customer Reviews | 3.2 3.2 out of 5 stars (37) |
| Global Trade Identification Number | 00009100004055 |
| Included Components | 405 |
| Item Type Name | Spark Plug |
| Item Weight | 1.6 ounces |
| Manufacturer | FRAM |
| Manufacturer Part Number | 405 |
| Manufacturer Warranty Description | Lifetime Limited Warranty |
| Model Number | 405 |
| OEM Equivalent Part Number | 405 |
| Part Interchange Info | 405 |
| Thread Size | Regular Metric |
| Top Material Type | Alloy Steel |
| UPC | 009100004055 |
| Unit Count | 1.0 Count |

## Product Details

- **Brand:** Autolite Iridium Ultra
- **Core Material:** Copper
- **Thread Size:** Regular Metric
- **Top Material Type:** Alloy Steel
- **Vehicle Service Type:** Car, Truck

## Images

![Autolite 405 Copper Resistor Automotive Replacement Spark Plug (1 Pack) - Image 1](https://m.media-amazon.com/images/I/81eRhOmNX7L.jpg)
![Autolite 405 Copper Resistor Automotive Replacement Spark Plug (1 Pack) - Image 2](https://m.media-amazon.com/images/I/81ROjlG55BL.jpg)

## Available Options

This product comes in different **Number Of Items** options.

## Customer Reviews

### ⭐⭐⭐⭐⭐ Great product! Worked like a charm
*by A***F on June 21, 2016*

Great product! Worked like a charm.

### ⭐ Only One Plug
*by B***T on January 15, 2026*

Shows pack of four, but only one plug.

### ⭐⭐ Product good. Delivery shorted every time.
*by J***F on September 21, 2023*

The first time I ordered 2 sets of 4 and only received 1 set of 4. I complained about the shortage of one set of 4 and received just one more piece. I sent it back because it was incomplete and then received 2 pieces. I am still short 2 spark plugs of the second set of 4.

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**Shop now:** [https://www.desertcart.co.uk/products/14819832-autolite-405-copper-resistor-automotive-replacement-spark-plug-1-pack](https://www.desertcart.co.uk/products/14819832-autolite-405-copper-resistor-automotive-replacement-spark-plug-1-pack)

---

*Product available on Desertcart United Kingdom*
*Store origin: GB*
*Last updated: 2026-05-30*