# BPR7HIX NGK Iridium Spark Plug | Genuine NGK Spark Plug

## 🔧 Product Description

**NGK Iridium Spark Plug – Part Number: BPR7HIX**

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: 5944
-   Thread: 14 mm
-   Reach: 12.7 mm (1/2 in)
-   Hex: 20.8 mm (13/16 in)
-   Seat: Gasket
-   Type: Projected

## 🚘 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.

-   Marine Drive Systems 85 – Inboard Engine
-   Marine Drive Systems 110 – Inboard Engine
-   Volvo-Penta BB115A – Inboard Engine
-   Volvo-Penta BB115B – Inboard Engine
-   Volvo-Penta BB115C – Inboard Engine
-   Volvo-Penta BB165A – Inboard Engine
-   Volvo-Penta BB170A – Inboard Engine
-   Volvo-Penta BB170B – Inboard Engine
-   Volvo-Penta AQ105A, 110, 115A, 120 – Inboard Engine
-   Volvo-Penta AQ130, A, B, C, D – Inboard Engine
-   Volvo-Penta AQ165A – Inboard Engine
-   Volvo-Penta AQ170, A, B, C – Inboard Engine
-   Force (U.S. Marine) (25 HP, 1999-1996) – Outboard Engine
-   Force (U.S. Marine) (15 HP, 1999-1984) – Outboard Engine
-   Johnson (275 HP, 1988-1985) – Outboard Engine
-   Johnson JET (40 HP, 2001-1999) – Outboard Engine
-   Johnson JET (30 HP, 2001-1999) – Outboard Engine
-   Johnson (3.5 HP, 2005-2004) – Outboard Engine
-   Mercury 4 (4 HP, 1982-1980) – Outboard Engine
-   Tanaka TOB 550 (5.5 HP, 1988-1984) – Outboard Engine
-   Tanaka TOB 550L (5.5 HP, 1988-1984) – Outboard Engine
-   Volvo-Penta 252 (1974-1973) – Outboard Engine
-   Aprilia QUASAR 100 (100, 2004-2003) – Motorcycle
-   Aprilia MOJITO CUSTOM 50 2T - APRILIA (50, 2004-1999) – Motorcycle
-   Aprilia MOJITO RETRO 50 2T - APRILIA (50, 2003-1999) – Motorcycle

That is the 25 most common of 156 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: 4205, W22FPR-ZU
-   Bosch: W5BP
-   Torch: E7RTP

## 📦 Condition

-   Brand new genuine product
-   Supplied in original packaging

## Details

- **Price:** 36.0 AUD
- **Vendor:** NGK
- **Type:** Ignition & Controls

## Variants

| Variant | Price | Available |
|---------|-------|-----------|
| Default Title | 36.00 AUD | In stock |

## Images

- BPR7HIX NGK iridium spark plug

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> Source: [Sawley's Auto and Marine](https://www.sawleysautoandmarine.com.au/products/bpr7hix-ngk-iridium-spark-plug-genuine-ngk-spark-plug)
> Updated: 2026-09-03