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B&Q£5.54Visit shop B&Q - Tx Double-Countersunk Yellow-Passivated Steel Wood Screw (Dia)4mm (L)30mmPack Of 100
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This guide is for DIY enthusiasts and professionals seeking reliable fastening solutions for wood projects. The Turbodrive Tx Double-Countersunk Steel Wood Screw in Yellow offers durability and a clean finish, though its specific size may limit its application in very fine or heavy-duty tasks. This pack contains 100 yellow zinc-plated screws, constructed from robust steel, measuring 30mm in length with a 4mm diameter, featuring a double-countersunk head for a flush finish.
| Colour | Yellow |
|---|---|
| Brand | TurboDrive |
You will need a Tx (Torx) compatible driver bit, typically a Tx25 for this screw size, to match the drive recess on the screw head.
The yellow zinc plating offers some corrosion resistance, making them suitable for occasional use in protected outdoor applications. However, for prolonged exposure to weather, especially rain and direct sunlight, stainless steel screws are recommended for better durability.
A single countersunk head is angled to sit flush in a conical recess. A double countersunk head is designed with an additional chamfer on the underside of the head, allowing it to sit even more cleanly and flush within the wood, especially useful in thinner materials or when a perfectly smooth finish is required.
Store the screws in a dry, well-ventilated area away from moisture. Ensure they are not left exposed to the elements, especially in humid or salty environments.
While constructed from durable steel, their 30mm length and 4mm diameter are generally suitable for general woodworking and DIY tasks. For critical structural applications, it is always recommended to consult engineering guidelines and use fasteners specifically rated for those purposes.
Yes, after the screw is driven flush, you can paint or varnish over it. The double-countersunk head ensures a smooth surface for finishing.
Ensure you are using the correct size Tx driver bit and that it is firmly seated in the screw head. Apply consistent downward pressure while driving the screw. If stripping has occurred, try using pliers to grip and remove the screw, or drill it out.
Pre-drill a pilot hole that is adequately sized for the screw's shank. For hardwoods, consider drilling a slightly larger pilot hole or using a countersink bit to create a recess for the head.
Check if the pilot hole is too large or if the wood is too soft. Ensure the screw is penetrating sufficiently into a solid section of the wood. For critical applications, consider using a larger diameter screw or appropriate anchors.
This may indicate exposure to moisture or corrosive elements. While the plating offers protection, prolonged exposure can lead to discoloration. Ensure screws are stored in a dry place and clean off any contaminants.
Setup:
These screws require a pilot hole, especially in hardwoods, to prevent wood splitting and ensure easy insertion. The pilot hole diameter should be slightly smaller than the screw's core diameter (approximately 2.5-3mm for a 4mm screw). A Tx (Torx) compatible driver bit is necessary for engaging with the screw head to prevent stripping and ensure maximum torque transfer.
Compatibility:
These screws are designed for use with wood. They are compatible with most common wood types, including pine, oak, and plywood. The Tx drive system is widely available in power drills and screwdrivers.
Care:
Store screws in a dry environment to maintain the integrity of the zinc plating and prevent corrosion. Keep the container sealed to avoid dust and debris contamination. Wipe away any sawdust or debris from the screw head after insertion to preserve the aesthetic finish.
