# BM7F NGK Standard Compact Spark Plug | Genuine NGK Spark Plug

## 🔧 Product Description

**NGK Standard Compact Spark Plug – Part Number: BM7F**

Spark plugs are a critical engine component, providing the spark that ignites the air-fuel mixture that drives an engine. NGK spark plugs feature trivalent plating – a silver/chrome-coloured finish on the threads – for corrosion resistance against moisture and chemicals, and are designed to meet or exceed OE standards.

## ⚙️ Key Features

-   Standard nickel centre electrode
-   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: 6421
-   Thread: 14 mm
-   Reach: 9.5 mm (3/8 in)
-   Hex: 16 mm (5/8 in)
-   Seat: Tapered
-   Type: Compact

## 🚘 Application

Listed in NGK's application charts for lawn, garden and commercial equipment. 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.

-   Craftsman (Sears) 2.5 – Chainsaw
-   Craftsman (Sears) 3.5/20 – Chainsaw
-   Craftsman (Sears) 4.5/23 – Chainsaw
-   Craftsman (Sears) BARRACUDA – Chainsaw
-   Homelite 330, 350, 360 MODELS – Chainsaw
-   Homelite 410 MODELS – Chainsaw
-   Homelite 450 MODELS – Chainsaw
-   Homelite 550 MODELS – Chainsaw
-   Homelite EZ – Chainsaw
-   Homelite MINI MODELS – Chainsaw
-   Homelite SUPER EZ, SUPER EZ-AO – Chainsaw
-   Homelite XL-MINI, XL-MINI-AUTO – Chainsaw
-   Mcculloch 5-10A, 5-10G – Chainsaw
-   Mcculloch 6-10, 6-10A – Chainsaw
-   Mcculloch 7-10A – Chainsaw
-   Mcculloch CP-70, CP-70L – Chainsaw
-   Mcculloch CP-125, CP-125S – Chainsaw
-   Mcculloch G-170 – Chainsaw
-   Mcculloch G-70, PM-60, SP-81 – Chainsaw
-   Mcculloch LG-6 – Chainsaw
-   Mcculloch MAC 10 SERIES 4-10 – Chainsaw
-   Mcculloch MAC 10 SERIES 5-10 – Chainsaw
-   Mcculloch PM-81 – Chainsaw
-   Mcculloch PM-125, PM-125C – Chainsaw
-   Mcculloch PRO MAC 800, 850 – Chainsaw

That is the 25 most common of 49 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: 6030, 6041, T22M-U, WA22M, WA22M-U
-   Champion: 5851, 5851S, 851, DJ6J
-   Autolite: 2954, XST2954, XST2954DP
-   Bosch: 7539, HS5E
-   Torch: N7C, N7RC
-   ACDelco: CS41T
-   Gator/Oregon: 77-316
-   Motorcraft: AF3NX

## 📦 Condition

-   Brand new genuine product
-   Supplied in original packaging

## Details

- **Price:** 10.0 AUD
- **Vendor:** NGK
- **Type:** Ignition & Controls

## Variants

| Variant | Price | Available |
|---------|-------|-----------|
| Default Title | 10.00 AUD | In stock |

## Images

- BM7F NGK spark plug
- BM7F NGK spark plug firing end

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> Source: [Sawley's Auto and Marine](https://www.sawleysautoandmarine.com.au/products/bm7f-ngk-standard-compact-spark-plug-genuine-ngk-spark-plug)
> Updated: 2026-09-03