# DF8H-11B NGK Iridium Double Fine Spark Plug | Genuine NGK Spark Plug

## 🔧 Product Description

**NGK Iridium Double Fine Spark Plug – Part Number: DF8H-11B**

NGK iridium spark plugs feature an iridium alloy on the centre electrode, welded on with a laser – one of the world's hardest metals, with a melting point of 2450°C, giving very high resistance to spark erosion and, on average, double the service life of a standard nickel spark plug.

## ⚙️ Key Features

-   Fine iridium-tipped centre electrode and platinum-tipped ground electrode for a slow wear rate, stable idle, improved fuel efficiency and lower emissions
-   Longer service life
-   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
-   Triple seals prevent leakage
-   Copper core aids in heat removal

## 📏 Specifications

-   NGK stock number: 90174
-   Thread: 12 mm
-   Reach: 26.5 mm (1.04 in)
-   Hex: 14 mm
-   Seat: Gasket
-   Terminal: Solid
-   Type: Projected Dual Fine Electrode

## 🚘 Application

Listed in NGK's application charts for automotive vehicles.

-   Infiniti EX37 (2013) – 6 per engine
-   Infiniti FX37 (2013) – 6 per engine
-   Infiniti G37 (2013-2008) – 6 per engine
-   Infiniti M37 (2013-2011) – 6 per engine
-   Infiniti Q40 (2015) – 6 per engine
-   Infiniti Q50 (2015-2014) – 6 per engine
-   Infiniti Q60 (2015) – 6 per engine
-   Infiniti Q70 (2017-2014) – 6 per engine
-   Infiniti Q70L (2017-2015) – 6 per engine
-   Infiniti QX50 (2017-2014) – 6 per engine
-   Infiniti QX70 (2017-2014) – 6 per engine
-   Nissan 370Z (2017-2009) – 6 per engine

## 📦 Condition

-   Brand new genuine product
-   Supplied in original packaging

## Details

- **Price:** 55.0 AUD
- **Vendor:** NGK
- **Type:** Ignition & Controls

## Variants

| Variant | Price | Available |
|---------|-------|-----------|
| Default Title | 55.00 AUD | In stock |

## Images

- DF8H-11B NGK spark plug

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> Source: [Sawley's Auto and Marine](https://www.sawleysautoandmarine.com.au/products/df8h-11b-ngk-iridium-double-fine-spark-plug-genuine-ngk-spark-plug)
> Updated: 2026-09-03