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This guide is for DIY enthusiasts and professionals working with timber projects. The TIMco Carriage Bolts & Hex Nuts (M6 x 150mm) offer a secure and robust fastening solution, particularly for joining wood or attaching metalwork to wood. A key benefit is their anti-spin square shoulder, which prevents rotation during tightening. A minor caveat is that while fully threaded up to 150mm, longer versions may be partially threaded, which could affect grip in certain applications.
| Colour | Silver |
|---|---|
| Model Part Number | M6 X 150 |
| Brand | Timco |
The square shoulder is designed to dig into the material (typically wood) when the nut is tightened. This prevents the bolt from spinning, allowing for secure fastening with a wrench or socket on the nut side only.
You will need a drill to create the pilot hole and a method to create a square recess for the shoulder (like a chisel or specialized bit). For tightening, you'll need a wrench or socket set for the M6 hex nut.
A fully threaded bolt has threads along its entire length up to the head. A partially threaded bolt has a smooth shank section above the threads. For these M6 x 150mm bolts, they are fully threaded up to 150mm. Longer bolts may have a smooth shank above the threads, which can affect how much material the threads grip.
The zinc finish offers some corrosion resistance, making them suitable for many outdoor applications. However, for highly exposed or coastal environments, stainless steel alternatives would be more durable.
For the bolt shank, drill a hole slightly larger than M6 (around 6.5mm to 7mm). For the square shoulder, you'll need to create a square recess that snugly fits the shoulder's dimensions.
Washers are recommended, especially when fastening softer materials like wood. A washer placed under the hex nut helps to distribute the clamping force over a larger area, preventing the nut from crushing the material.
Ensure the square shoulder of the bolt is properly seated in a sufficiently sized square recess in the timber. If the recess is too shallow or not square, the bolt will spin. Enlarge the recess if necessary.
Check if the pilot hole is the correct size for the bolt's shank and if the square recess is adequately prepared. Remove any debris from the holes.
Verify that the bolt and nut are the same thread size (M6). Check for any damage or debris on the bolt threads or inside the nut.
The zinc finish provides moderate protection. For applications exposed to moisture, consider using stainless steel alternatives or applying a protective coating after installation.
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