# BM7A NGK Standard Compact Spark Plug | Genuine NGK Spark Plug

## 🔧 Product Description

**NGK Standard Compact Spark Plug – Part Number: BM7A**

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: 6521
-   Thread: 14 mm
-   Reach: 9.5 mm (3/8 in)
-   Hex: 19 mm (3/4 in)
-   Seat: Gasket
-   Type: Compact

## 🚘 Application

Listed in NGK's application charts for marine, motorcycle, ATV and snowmobile equipment and 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.

-   Hardley CHOPPER - ROBINS (3.7 HP) – Motorcycle
-   Hardley ROADSTARR - ROBINS (3.7 HP) – Motorcycle
-   Agway PL4, PL5, PL6 – Chainsaw
-   Clinton E10 (1965) (3.6ci) – Chainsaw
-   Craftsman (Sears) 3.7, 3.7A, 3.7PS – Chainsaw
-   Craftsman (Sears) 35138, 35147, 35148, – Chainsaw
-   Craftsman (Sears) 35372, 35373, 35375, – Chainsaw
-   Craftsman (Sears) 35607, 35628, 35633, – Chainsaw
-   Craftsman (Sears) 35886, 35904 – Chainsaw
-   Craftsman (Sears) BEAVER 1.9 – Chainsaw
-   Danarm 36AV – Chainsaw
-   Danarm 55, 55 LH/RH – Chainsaw
-   Danarm 76 – Chainsaw
-   Danarm 1-36, 1-36 MKII, 1-36-SS – Chainsaw
-   Danarm 1-71, 1-71-SS – Chainsaw
-   Danarm 2-36-SS – Chainsaw
-   Dayton 4Z-252 – Chainsaw
-   Farmer F55, F55A, F65 – Chainsaw
-   Frontier-Tml F35, FB35 – Chainsaw
-   Frontier-Tml F35VIP, FB35VIP – Chainsaw
-   Frontier-Tml EINHELL, FERCAD, ROCKY – Chainsaw
-   Frontier-Tml GREEN B., PIONEER, RANCH – Chainsaw
-   Frontier-Tml MARK I, V.I.P. – Chainsaw
-   Frontier-Tml STAR DIFFUSION – Chainsaw
-   Hmc GREEN MACHINES (XENOAH ENGINE) – Chainsaw

That is the 25 most common of 273 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.

-   Champion: 5843, 5843S, 849, 862, CJ3, CJ4, CJ6
-   DENSO: 6026, 6048, W22M, W22M-U, W22M-US
-   ACDelco: CS40, CS41, CS42, CS42S
-   Bosch: 7541, WS5E
-   Autolite: 253
-   E3: E3.12
-   Gator/Oregon: 77-308
-   Motorcraft: A2NX

## 📦 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

- BM7A NGK spark plug
- BM7A NGK spark plug firing end

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> Source: [Sawley's Auto and Marine](https://www.sawleysautoandmarine.com.au/products/bm7a-ngk-standard-compact-spark-plug-genuine-ngk-spark-plug)
> Updated: 2026-09-03