Structural timber wood screw with washer head TX, C4, yellow zinc, 4 x 30 to 6 x 200, 300 to 1000st per box, Klimas

Structural timber screw with washer head and TX drive for timber constructions

This structural timber screw is a strong and versatile wood screw with a large washer head, designed for fixing brackets, post bases, beams and other timber joints where high clamping force and a low installation height are required. The large head provides a generous bearing surface, making it an excellent alternative to traditional coach screws in structural applications.

The screw is made from carbon steel, yellow zinc plated and wax coated for faster installation and reduced friction. The cutting tip and serrated zone significantly reduce driving resistance, allowing the screw to be used in solid timber, glulam and wood-based panels such as OSB, plywood and particleboard – both indoors and outdoors.

Features and benefits

• Washer head (large head) provides high clamping force and secure fixing of brackets and structural elements
• TX drive ensures stable torque transfer without bit slippage
• Cutting serrations, drilling zone and cutting edges reduce driving resistance by up to 20%
• Double thread in the tip area provides faster bite and easier starting in timber
• C4-classified yellow zinc coating for long-term corrosion protection outdoors
• Wax coating reduces torque and extends runtime for cordless tools
• CE and ETA-18/0817 approved screw for load-bearing timber structures
• High mechanical performance values suitable for structural timber design
• Developed for professional users, but also suitable for demanding DIY projects

New improved tip – faster bite and lower resistance

The improved cutting tip is engineered to deliver even better performance during installation. Its optimised geometry reduces both starting resistance and friction throughout driving, making the work faster, easier and more energy efficient – especially with cordless tools.

• Faster starting – the screw bites immediately, even when it is difficult to apply pressure
• Up to 20% lower resistance during the full driving cycle
• Up to 40% shorter installation time in tests compared to the previous tip design
• Longer runtime for cordless tools thanks to reduced load
• Cutting serrations break the wood fibres and reduce friction
• Allows longer screw lengths to be driven even with smaller tools

Technical information

Applications

Used for fixing brackets, post bases, beams, timber frames, roof structures and panel materials in load-bearing timber systems. A modern alternative to coach screws in installations where a clean finish, high clamping force and low installation height are important. Ideal for professional contractors, carpenters and builders, as well as serious DIY users across Europe.

Need larger quantities or other screw types?

Contact us for a quotation – we supply the right screws and fasteners for your project at very competitive prices, with bulk solutions for companies and workshops.

❓ Frequently Asked Questions (FAQ)

• Is pre-drilling required? No, not in most wood types thanks to the cutting tip and serrated zone.
• Are these screws suitable for outdoor use? Yes, the C4 corrosion class and yellow zinc coating make them suitable for outdoor environments and harsher climates, while also working perfectly indoors.
• Can they replace coach screws? Yes, with lower installation height, faster installation and a cleaner look.
• Which materials are suitable? Solid timber, glulam and wood-based panels such as OSB, plywood and particleboard.

About KLIMAS

Klimas is one of Europe’s leading manufacturers of fastening solutions and screws for professional construction. The company’s products are sold in over 65 countries worldwide and are known for high performance, long service life and reliable structural behaviour. Klimas is regarded as one of the largest and most reputable screw producers in Europe.

CERTIFICATIONS

KLIMAS provides corrosion protection equivalent to C3/C4-rated structural wood screws and belongs to the same performance segment as other professional screw systems used in Europe. The coating and durability are comparable to:

• Würth Zinc-Nickel
• Heco-Protect
• ESSVE CorrSeal
• Hilti ZF

ETA-18/0817 – CE approved according to Eurocode 5 and Swedish EKS

ETA is the highest level of European approval for load-bearing structural screws. The certification confirms that KLIMAS screws:

• are approved for use in load-bearing timber structures
• meet all requirements of Eurocode 5 (EN 1995-1-1)
• comply with harmonized regulations for use in Sweden and across the EU

For engineers and designers, KLIMAS screws function equivalently to other established ETA-approved brands, such as:

• ESSVE structural wood screws ETA
• Heco Topix ETA
• Reisser ETA
• Würth ASSY ETA

Characteristic mechanical properties of WKCP screws

Based on European design standards for timber structures.

1. Withdrawal and head pull-through values for wood are based on a reference density ρₐ = 350 kg/m³.
2. Withdrawal and head pull-through values for LVL are based on a reference density ρₐ = 480 kg/m³.

Geometry