# 8938 Dunbier H3810G Mackay M10 x 60 Galvanised Coach Bolt and Nut | Marine Trailer Part

## 🔧 Product Description

**Dunbier Galvanised Coach Bolt M10 × 60mm with Nut – Part Number: 8938**

A replacement M10 × 60mm trailer fastener supplied in a galvanised steel configuration. It is intended for Dunbier trailer timber, plastic, pad, bracket or accessory joints that specify a square-neck coach bolt and should only replace hardware with the same dimensional, thread and strength specification.

## ⚙️ Key Features

-   M10 fastener diameter
-   Nominal length: 60mm
-   galvanised steel finish/material
-   Hex-head trailer fastener
-   Suitable for marine trailer servicing when matched to the original installation
-   Matching matching M10 nut supplied

## 📏 Specifications

-   Diameter/thread: M10
-   Nominal length: 60mm
-   Thread form: metric coarse unless the original application specifies otherwise
-   Strength requirement: standard trailer hardware; match the original bolt grade and head markings
-   Finish/material: galvanised steel
-   Round head with square neck designed to resist rotation in the mounting material

## 🔄 Cross Reference & Related Parts

-   Dunbier: 8938
-   Mackay: H3810G
-   A generic replacement is acceptable only when diameter, length, thread pitch, strength grade, finish and shank configuration all match
-   Do not substitute lower-grade hardware or an unverified stainless bolt in a high-tensile structural application

## 🚤 Trailer Compatibility & Application

-   Suitable for Dunbier trailer timber, plastic, pad, bracket or accessory joints that specify a square-neck coach bolt
-   Measure the original bolt from beneath the head to the end of the thread unless the fastener standard states otherwise
-   The unthreaded grip length must suit the clamped joint and must not bottom the nut before the components are secure
-   Use the correct washer, locking nut or spring washer for the original joint

## 🔌 Function

Clamps the associated trailer components together and transfers shear, tension and vibration loads through the mounting joint.

## ⚠️ Common Signs of Failure

-   Thread is stretched, crossed, stripped or heavily corroded
-   Bolt shank is bent, necked, grooved or worn
-   Hex head is rounded or cracked
-   Joint repeatedly loosens despite correct torque and locking hardware
-   Corrosion has materially reduced the fastener diameter

## 🛠️ Installation & Safety

-   Confirm the replacement grade from the original bolt head and trailer parts documentation
-   Do not reuse a fastener that has stretched, yielded or suffered severe corrosion
-   Tighten to the specification for the exact bolt grade, thread, finish and joint
-   Use corrosion-compatible washers and locking hardware
-   Recheck critical trailer fasteners after the first trip and during routine servicing

## 📦 Condition

-   Brand new Dunbier Marine Products trailer component
-   Supplied as one bolt and matching nut
-   Supplied in original or equivalent packaging

## Details

- **Price:** 2.0 AUD
- **Vendor:** Dunbier
- **Type:** Fasteners & Fixings
- **Tags:** Dunbier Boat Trailers | Marine Trailer Parts & Accessories

## Variants

| Variant | Price | Available |
|---------|-------|-----------|
| Default Title | 2.00 AUD | In stock |

## Images

- 8938 Dunbier H3810G Mackay M10 x 60 Galvanised Coach Bolt and Nut | Marine Trailer Part

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> Source: [Sawley's Auto and Marine](https://www.sawleysautoandmarine.com.au/products/8938-dunbier-m10-x-60-galvanized-coach-bolt-nut-mackay-h3810g)
> Updated: 2026-09-06