# BR6HIX NGK Iridium Spark Plug | Genuine NGK Spark Plug

## 🔧 Product Description

**NGK Iridium Spark Plug – Part Number: BR6HIX**

Iridium NGK spark plugs offer a longer service life than a standard nickel-tipped spark plug: while nickel-alloy plugs offer a service life of roughly 20,000-40,000km, NGK Iridium IX spark plugs offer a service life of up to 60,000km, so fewer replacements are needed over time despite the higher initial cost.

Precious-metal spark plugs like the NGK Iridium IX also offer higher ignitability, achieved with an exposed fine-tip centre electrode that promotes superior flame growth compared with a standard spark plug. Iridium has a much higher melting point (2410°C) than nickel (1453°C), allowing the centre electrode diameter to be reduced from 2.5mm to 0.6mm – a smaller electrode mass that reduces the impedance to flame progress, helping acceleration, fuel consumption and idle quality.

## ⚙️ Key Features

-   Fine iridium-tipped centre electrode for a slow wear rate and stable idle
-   Longer service life than standard nickel plugs
-   Trivalent metal plating provides superior anti-corrosion and anti-seizing properties
-   Corrugated ribs reduce the risk of flashover
-   Pure alumina silicate ceramic insulator, providing superior strength and better heat transfer
-   Copper core aids in heat removal
-   Triple seals prevent leakage

## 📏 Specifications

-   NGK stock number: 3419
-   Thread: 14 mm
-   Reach: 12.7 mm (1/2 in)
-   Hex: 20.8 mm (13/16 in)
-   Seat: Gasket

## 🚘 Application

Listed in NGK's application charts for marine, motorcycle, ATV and snowmobile equipment and automotive vehicles. The gap is not the same on all of them – the chart lists between 0.5 mm and 1.0 mm depending on the engine, so check the line for yours.

-   Mercruiser 60 (4 CYL RENAULT) – Inboard Engine
-   Volvo-Penta B18A – Inboard Engine
-   Volvo-Penta BB100 – Inboard Engine
-   Volvo-Penta BB100A – Inboard Engine
-   Volvo-Penta BB30B – Inboard Engine
-   Volvo-Penta AQ90 – Inboard Engine
-   Chrysler STD IGN (55 HP, 1976-1967) – Outboard Engine
-   Chrysler (50 HP, 1984-1981) – Outboard Engine
-   Chrysler (45 HP, 1984-1968) – Outboard Engine
-   Chrysler MAGNETO (45 HP, 1978-1971) – Outboard Engine
-   Chrysler (35 HP, 1984-1968) – Outboard Engine
-   Chrysler (30 HP, 1982-1973) – Outboard Engine
-   Chrysler (25 HP, 1984-1973) – Outboard Engine
-   Chrysler (20 HP, 1982-1968) – Outboard Engine
-   Chrysler (15 HP, 1984-1974) – Outboard Engine
-   Chrysler (12.9 HP, 1973-1971) – Outboard Engine
-   Chrysler (12 HP, 1979) – Outboard Engine
-   Chrysler (10 HP, 1978-1974) – Outboard Engine
-   Chrysler (9.9 HP, 1986-1968) – Outboard Engine
-   Chrysler (8 HP, 1981-1979) – Outboard Engine
-   Chrysler (7.5 HP, 1984-1979) – Outboard Engine
-   Chrysler (7 HP, 1970-1969) – Outboard Engine
-   Chrysler (6.6 HP, 1968) – Outboard Engine
-   Chrysler (6 HP, 1977-1971) – Outboard Engine
-   Chrysler (6 HP, 1982-1978) – Outboard Engine

That is the 25 most common of 234 applications NGK's charts list for this plug – ask us to check yours.

## 🔄 Supersession & Cross Reference

NGK's cross-reference tables list this plug against these part numbers.

-   DENSO: 3074, 5359, 5378, IWF16, IWF20, W20FS-GU, W20FS-ZU
-   Magneti Marelli: CWP5N, CWP6N, CWP7N
-   Bosch: W6AS, W7AP
-   Champion: 1224, RL85G
-   Autolite: AP425

## 📦 Condition

-   Brand new genuine product
-   Supplied in original packaging

## Details

- **Price:** 33.0 AUD
- **Vendor:** NGK
- **Type:** Ignition & Controls

## Variants

| Variant | Price | Available |
|---------|-------|-----------|
| Default Title | 33.00 AUD | In stock |

## Images

- BR6HIX NGK iridium spark plug
- BR6HIX NGK iridium spark plug firing end

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> Source: [Sawley's Auto and Marine](https://www.sawleysautoandmarine.com.au/products/br6hix-ngk-iridium-spark-plug-genuine-ngk-spark-plug)
> Updated: 2026-09-03