Heavy duty structural timber screws with a hex head, fixed washer and exterior-grade silver corrosion resistant coating. No pilot hole needed in most timber. A direct replacement for traditional coach screws, with faster installation and high pull-out resistance.
Size
QTY
Price
QTY
6.7 x 125mm
50
£3.43£4.12
8.0 x 75mm
10
£3.43£4.12
8.0 x 100mm
10
£3.82£4.58
8.0 x 150mm
10
£5.10£6.12
8.0 x 200mm
10
£6.48£7.78
10.0 x 100mm
10
£4.79£5.75
10.0 x 150mm
10
£6.80£8.16
10.0 x 200mm
10
£8.71£10.45
These exterior hex head timber screws are designed as a practical, time-saving alternative to traditional coach screws. Where a coach screw requires a pilot hole, a spanner, and a fair bit of patience, these structural screws drive straight into most timber types without pre-drilling. That alone makes a noticeable difference on site, especially when you are running fixings through posts, beams, or structural frames in quantity.
The hex head sits countersunk over a fixed washer, giving a clean, secure bearing surface without the washer spinning or shifting during installation. Drive them with a standard socket or impact driver and you are done. No mucking about with separate washers or hunting for the right spanner size mid-job.
What Makes These Exterior Hex Head Timber Screws Different
The thread design is worth understanding. A 50-degree deep single thread cuts through timber aggressively and provides high pull-out resistance once seated. This is not a standard woodscrew profile. The geometry is specifically engineered for structural load, which is why these are used in framing, decking substructures, pergola builds, fencing, and anywhere else where the fixing needs to hold under real stress.
The single slash point at the tip reduces the torque needed to start the screw and lowers the risk of timber splitting, particularly when you are working close to an edge or end grain. The helix on the shank clears debris as the screw drives in, which helps maintain consistent clamping force and keeps the thread engagement clean.
Corrosion Resistance for Exterior Use
The silver coating is a patented multi-layer corrosion resistant plating, tested to withstand 1,000 hours of salt spray. That is a meaningful figure for anyone fixing in exposed or coastal environments. Treated timber, wet conditions, and outdoor exposure are all situations where standard zinc-plated screws deteriorate over time. These hold up considerably better, which matters when the fixing is structural and replacement is not a straightforward option.
Available in a range of sizes from 6.7 x 125mm through to 10.0 x 200mm, there is a size suited to most structural timber applications. The 8.0mm diameter screws cover the majority of standard framing and decking work. The 10.0mm range is suited to heavier structural timber where maximum holding power is the priority. Boxes are available in quantities of 10 or 50, so you can buy a small quantity for a one-off job or stock up properly for a larger project.
For any external build where coach screws would traditionally have been specified, these exterior hex head timber screws offer the same structural performance with a faster, cleaner installation. They are a straightforward upgrade that saves time without compromising on the fixing.
Pro Tip: When fixing into the end grain of structural timber, drop to the next size down and add one extra screw per fixing point rather than relying on a single large screw, as end grain pull-out resistance is significantly lower than face grain regardless of screw size.
These structural screws are used across a wide range of external and structural timber applications. Common uses include post and beam connections, pergola and carport frames, decking substructure, fencing, timber retaining walls, garden structures, and agricultural buildings. They are also well suited to internal structural work where extra load capacity is needed, such as stud wall connections, joist hangers, and ridge beam fixings.
Groundworkers, carpenters, landscapers, and general builders all use structural screws like these as a day-to-day alternative to coach screws. Anywhere you would previously have used a bolt and washer arrangement in timber, these screws offer a faster single-tool fix.
Best For
Post and beam structural connections
Decking substructure and joists
Pergola and carport frames
Fencing and gate posts
Timber retaining walls
Agricultural and garden structures
Heavy-duty external timber fixings
Available In
6.7 x 125mm
8.0 x 75mm
8.0 x 100mm
8.0 x 150mm
8.0 x 200mm
10.0 x 100mm
10.0 x 150mm
10.0 x 200mm
Box quantities: 10 or 50
Key Properties
No pilot hole required in most timber
Hex head countersunk with fixed washer
50 degree deep single thread for high pull-out resistance
Single slash point reduces torque and splitting risk
Not suitable for: Not suitable for use in masonry, concrete, or steel without appropriate anchors or fixings. Not recommended as a direct replacement for structural bolts in applications governed by engineered connection specifications without confirming load ratings with a structural engineer.
These screws can be driven directly into most timber types without a pilot hole, using a standard hex socket bit or impact driver set to the appropriate torque. For very dense hardwoods or when fixing close to an edge, a pilot hole can reduce splitting risk and make driving easier.
Select the screw length based on the combined thickness of the materials being joined. A general guide is to ensure at least half the screw length is embedded in the receiving timber. For structural connections, follow any applicable span table or engineering guidance relevant to your project.
Select the correct screw diameter and length for the timber thickness and load requirement
Mark fixing positions, allowing adequate edge and end distances to avoid splitting
For dense hardwood or close edge distances, drill a pilot hole slightly smaller than the screw shank
Fit a hex socket bit to your impact driver or drill driver
Position the screw on the fixing point and drive at a steady speed to avoid overdriving
Check the fixed washer is seated flush against the timber surface once fully driven
Inspect the fixing for any splitting around the entry point, particularly in treated or end grain timber
Do these structural screws need a pilot hole?
No pilot hole is required in most timber types. The single slash point tip is designed to self-start and reduce torque during entry. For very dense hardwoods, or when fixing at low edge distances, drilling a pilot hole is advisable to reduce the risk of splitting.
Are these screws suitable for use with treated timber outdoors?
Yes. The patented multi-layer silver corrosion resistant plating is tested to 1,000 hours salt spray resistance, making these screws suitable for use with treated timber in exposed outdoor environments including coastal locations.
What drive type do these screws use?
These screws use a hex head drive. A standard hex socket bit fitted to an impact driver or drill driver is all that is needed. The fixed washer beneath the head means no separate washer is required.
These structural timber screws feature a countersunk hex head with an integrated fixed washer and a 50-degree deep single thread profile engineered for high pull-out resistance in timber. The single slash point tip reduces installation torque and minimises splitting risk at low edge distances. The shank helix clears debris during driving to maintain consistent clamping. The exterior silver coating is a patented multi-layer corrosion resistant plating rated to 1,000 hours salt spray testing in accordance with standard corrosion resistance test methods.
From £11.90£14.28 EX VATINC VAT Select options This product has multiple variants. The options may be chosen on the product page
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