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Power Tools Direct£34.86Visit shop Timco Green 200Indexsst Timber Frame Construction & Landscaping Screws - Hex - A4 Stainless Steel 6.7 X 200 Tube 25
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This guide is for builders, carpenters, and DIY enthusiasts working with timber, especially in demanding external or corrosive environments. The Timco Timber Screws offer superior corrosion resistance and secure fixing power as an alternative to traditional coach screws. A key consideration is their specialized application for timber-to-timber connections, requiring appropriate tools for installation. The screws feature A4 Stainless Steel construction for ultimate durability, a fixed washer for consistent pressure, and a unique helix shank that efficiently removes debris and enhances clamping force, ensuring a secure and reliable hold with reduced risk of timber splitting.
| Colour | Silver |
|---|---|
| Model Part Number | PTDTIM200INDEXSST |
| Brand | TIMco |
A4 Stainless Steel (like 316) contains Molybdenum, which significantly enhances its resistance to pitting and corrosion, especially in chloride-rich environments like coastal areas or applications involving chemicals. A2 is more common but less resistant to aggressive conditions.
For most softwoods, pre-drilling is often not required due to the screw's design. However, for hardwoods, dense woods, or when fixing very close to the end of a timber piece, pre-drilling a pilot hole is recommended to prevent splitting and ease insertion.
These screws are specifically designed and optimized for timber-to-timber applications. For timber-to-metal connections, you would typically need different types of fasteners and potentially specialized pilot holes.
The helix shank helps to clear wood debris as the screw is driven, reducing friction and preventing the hole from clogging. It also enhances the screw's clamping ability, leading to a more secure fixing.
The general rule is that the screw should penetrate the primary material (the piece being fastened into) by at least two-thirds of its thickness, or a minimum of 30-40mm for solid structural connections, depending on the load.
These screws have a Corrosion Rating of 5, indicating suitability for industrial and coastal areas with an aggressive salt atmosphere.
Yes, the A4 Stainless Steel is suitable for use with treated timber, especially those with higher levels of corrosion-inducing chemicals. It's also ideal for naturally corrosive woods like Oak or Cedar.
Ensure you are using the correct 8 mm socket size. Check for obstructions in the timber or if pre-drilling is needed for very dense wood. Reduce driving speed.
Reduce driving torque. Consider pre-drilling a pilot hole, especially near the end of the timber. Ensure the 25° sharp point is properly engaged with the wood surface.
Ensure the driver bit is fully seated in the hex head. Use a drill/driver with adequate torque control to avoid over-tightening. Check if the driver bit is worn.
Although highly corrosion-resistant, 'tea staining' can occur on stainless steel in certain atmospheric conditions. This is superficial and does not compromise structural integrity. Clean with a soft cloth and mild detergent. Ensure the timber itself is not leaching tannins that react with the steel.
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