Exterior Green Hex Head Timber Screws for Heavy-Duty Wood Fixing

Our Exterior Green Hex Timber Screws are built for strong, long-lasting wood-to-wood fixings in outdoor settings. Whether you're constructing raised beds, fixing sleepers, building fencing, or working on general landscaping, these heavy-duty screws give you solid grip, fast installation, and excellent corrosion resistance.

With a deep single thread, fixed washer, and helix shank to clear debris as you drive, they’re an ideal replacement for traditional coach screws – no pilot hole required in most cases.

Key Features

• Hex head with fixed washer – for high torque and clean clamping
• Green exterior coating – corrosion-resistant, rated for 1,000 hours salt spray
• Helix shank – clears debris to reduce resistance and improve grip
• Sharp point with slash tip – fast start and reduced timber splitting
• Deep thread – provides maximum pull-out resistance and strong hold in softwood and treated timber
• No pilot hole needed in most wood types – saving time on site

How to Use

1. Align your timber pieces and mark where the screw will go.
2. No pilot hole is needed for most softwoods. If you’re close to an edge or using particularly dense timber, a quick pilot may help avoid splitting.
3. Drive in with a socket wrench or impact driver using the hex head – the screw will cut in fast and pull tight as it goes.
4. Tighten until the fixed washer sits flush with the timber surface – no need for separate washers or prep.

Great for use in:

• Raised beds and planters
• Garden sleeper walls
• Fence posts and rails
• Pergolas, sheds and timber framing
• Deck framing and substructures

What Sizes Are Available?
We stock a full range of sizes to suit everything from small landscaping builds to structural timber joints:

Available sizes:
6.7 x 50mm, 6.7 x 60mm, 6.7 x 75mm, 6.7 x 87mm, 6.7 x 100mm, 6.7 x 125mm, 6.7 x 150mm, 6.7 x 175mm, 6.7 x 200mm, 6.7 x 250mm

What Size Screw Do I Need?
As a general rule, choose a screw that’s 2.5 to 3 times the depth of the top timber you’re fixing. This ensures a strong hold in the base timber.

• For 50mm sleepers or boards, go for 125mm–150mm screws
• For lighter fencing or framing, 75mm–100mm screws are ideal
• Our most popular sizes are 50mm, 75mm, and 100mm – great all-rounders for garden structures and general outdoor builds

If you’re unsure, it’s usually better to go slightly longer – especially on structural projects.

Why Choose These Over Coach Screws?
These timber screws are designed as a modern upgrade to the old-school coach screw. They offer better corrosion resistance, are faster to install (no pilot hole needed), and the fixed washer under the hex head gives a clean, tight clamping action without extra components.

You’ll save time and effort on every fix – and you won’t sacrifice holding strength.

Why Buy Timber Screw - Hex - Exterior Green from Fast Fixings Online?

When you buy your Timber Screw - Hex - Exterior Green from Fast Fixings Online, you’re getting more than just great fixings. We offer free next working day delivery on orders over £60, so your materials arrive when you need them. You can create a free account to save time on repeat orders, and if you join our VIP Rewards Club, the more you spend, the more you save. It’s our way of giving something back to loyal trades and customers who keep coming back.