Heavy Duty Construction Structural Exterior
Wood Timber Screws
Wood Timber Screws
Drive Faster, Last Longer in Pressure-Treated Timber
No Rust Stains, No Corrosion on Outdoor Wood Projects
Superior Pull-Out Strength for Secure, Vibration-Resistant Joints
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Sinsun Timber Screws Supplier | High-Performance Screws for Outdoor & Pressure-Treated Wood
As a leading timber screw supplier, Sinsun provides corrosion-resistant, high-strength screws designed for decking, fencing, and outdoor structures. Request a quote for durable wood fastening solutions.
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timberlok screws Introduction
Sinsun Timber Screws deliver uncompromising performance for professional wood construction and carpentry. Engineered with the advanced Type 17 design—featuring a sharp gimlet point and fluted shank—they install faster, eliminate pre-drilling, and provide exceptional holding power.
Made from high-quality materials and available with high-performance corrosion protection, they are built for lasting reliability in both indoor and outdoor structures.
This combination of superior engineering and durability reduces labor costs and prevents costly callbacks.
From heavy timber framing and decking to fine furniture assembly, Sinsun Timber Screws offer unmatched strength, efficiency, and safety for all your wood-based projects.
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Engineered Structural Integrity
Our screws meet or exceed international structural fastener standards (e.g., EN 14592), with a minimum tensile strength of 1,800 N/mm². This ensures reliable, code-compliant performance for critical connections in framing and heavy timber construction, providing peace of mind for engineers and builders.
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Superior Corrosion Resistance Options
Choose from a range of protective coatings. Our Hot Rust Proof (Bronze) coating withstands over 1,000 hours in standard salt spray tests (ASTM B117), offering exceptional durability for exterior and ground-contact applications. We also provide A2/A4 stainless steel and black oxide finishes for specific environmental and aesthetic needs.
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Fast, Clean & Split-Free Installation
The patented Type 17 self-tapping tip eliminates the need for pre-drilling in most woods, reducing installation time by up to 50%. Its sharp gimlet point and fluted shank efficiently cut material fibers, virtually eliminating wood splitting even near edges, saving material costs and rework.
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High-Performance Head & Drive Designs
Available in wafer head (for a flush finish with superior pull-through resistance) and hex head (for high-torque driving). Combined with optimized drive systems like Torx, they ensure maximum torque transfer, minimizing cam-out and tool wear for efficient, frustration-free fastening.
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Comprehensive Size & Strength for Any Project
From standard diameters to "big" screws with diameters up to 10mm and lengths exceeding 300mm, our range handles everything from fine carpentry to large-scale timber framing. Each size is engineered to deliver optimal shear and withdrawal values, providing a single, trusted source for all your fastening requirements.
| Item | Specification |
| Product Type | Type 17 Self-Tapping Timber Screw |
| Material | Medium Carbon Steel (Grade 4.8 or higher) |
| Surface Finish | 1. Hot Rust Proof Coating (Bronze) |
| 2. Zinc Electroplating Coating | |
| Point Type | Type 17 (Sharp gimlet point with chip-cutting flutes) |
| Thread Type | Coarse thread for wood (Complies with principles similar to ASTM C1002 Type W) |
| Drive Type | Phillips #2 / Square #2 / Torx T20/T25 (Options available) |
| Performance Standards | Refer to relevant ASTM fastener testing standards (e.g., for hardness, torque) |
| Packaging | Boxed or customer-customized packaging |
| Size (Diameter x Length) | Head Type (Key Feature) | Thread Length | Quantity per Box | Common & Recommended Applications |
| 4.0mm x 40mm | Flat Head (Countersunk) | Full thread | 200 pcs | Light-duty woodworking, furniture assembly, cabinet backing. |
| 4.5mm x 50mm | Flat Head (Countersunk) | Full thread | 200 pcs | General carpentry, indoor trim, light framing. |
| 5.0mm x 60mm | Wafer Head (Low-Profile) | Full thread | 100 pcs | Composite decking, face-fastening trim, thin materials (minimizes surface damage). |
| 5.5mm x 70mm | Wafer Head (Low-Profile) | Full thread | 100 pcs | Decking boards, sub-flooring, outdoor furniture (flush, high-clamp finish). |
| 6.0mm x 80mm | Hex Washer Head | Partial thread | 100 pcs | Structural framing, timber-to-timber connections, ledger boards (high-torque driving). |
| 8.0mm x 100mm | Hex Washer Head | Partial thread | 50 pcs | Heavy timber construction, post-to-beam connections, large wood members. |
| 10mm x 120mm | Hex Washer Head | Partial thread | 50 pcs | Big timber projects, glu-lam beams, major structural connections. |
Head Type Quick Guide
Flat Head (Countersunk)
Countersunk head that sinks below the material surface for a smooth, flush finish. Suitable for all standard woodworking projects.
IDEAL FOR: Smooth, Flush Surfaces
Wafer Head (Low-Profile)
Ultra-thin flat head design provides a countersunk effect without pre-drilling. Wide bearing surface prevents tearing through brittle materials.
IDEAL FOR: Composite & Decks
Hex Washer Head
A hexagonal head with a washer integrated, enabling high-torque installation. Prevents head sinking into wood in structural applications.
IDEAL FOR: Heavy-Duty Structural
Common specifications provided by Sinsun
Sinsun heavy duty timber screws: Professional Applications from Railway to Framing
Used for railway sleepers and track construction
Our M12/14mm grade screws are designed for heavy-duty work on the tracks. Their high-tensile steel (Grade 8.8 or A4-80 Stainless) can withstand more than 10,000,000 cycles of dynamic loading without coming loose. The deep-cut Torx drive allows you to tighten it with up to 150 Nm of torque. The hot-dip galvanized (550g/m虏) or bronze coating protects it from wear and tear and chemicals from treated wood for more than 30 years in harsh conditions.
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For framing with structural timber
These screws are certified for structural use (for example, ETA / ICC-ES) and take the place of regular bolts and connectors. They meet building codes for areas that are prone to earthquakes and hurricanes because they have a minimum tensile strength of 1,800 N/mm虏 and a shear strength of over 15 kN (for 8mm screws). The self-tapping tip eliminates the need to drill holes ahead of time, cutting installation time in half. The anti-corrosion coating (1,000+ hour salt spray) keeps the frame strong in all weather.
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For heavy outdoor wood structures like decking and cladding
Our screws are specifically designed for hardwood decking and facades. They feature a low-profile wafer head that prevents the surface from splitting and sits flush. The steel core has a dual-layer coating, consisting of a zinc base + polymer topcoat, which can withstand salt spray for 1,500 hours. The finish is guaranteed for 25 years. A built-in countersink rib ensures that the screw head fits perfectly every time, making it ideal fouse with E, Cumaru, and composite materials.
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For Large-Scale Glulam & Cross-Laminated Timber (CLT)
Our XL-series screws (up to 20mm diameter x 600mm length) are designed for mass timber construction. With a fully threaded shank and a continuous high helix, they provide pull-out resistance exceeding 30 kN in engineered wood.Using the bronze heat-treated point, columns, beams, and walls can be quickly assembled in less than 15 seconds. The hex washer head is compatible with pneumatic drivers at 3,000 RPM, and the bronze heat-treated point requires no further heat treatment than steel.
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FAQ
Why are Sinsun's timber sleeper screws good for use on railways?
Sinsun's timber sleeper screws are made from high-quality steel and have coatings that are better at resisting corrosion, such as hot-dip galvanizing or a rust-proof coating. In railway environments, they remain stable because they can withstand ground contact, vibrations, and heavy dynamic loads.
When should I use the 300mm length for sleeper screws?
Our sleeper screws 300mm long are ideal for securing multiple or extra-large landscape sleepers in retaining walls, providing deep penetration and immense pull-out resistance for the most demanding, heavy-duty landscaping projects.
Are the 250mm sleeper screws easy to drive into hardwood sleepers?
Yes, our sleeper screws 250mm feature a sharp self-tapping point (like Type 17) that minimizes splitting and a high-performance drive system, allowing for straightforward installation into dense hardwoods without the need for pre-drilling.
What is the main advantage of your Timberfix-style screws?
Sinus's Timberfix screws combine structural strength with installation speed. These versatile and reliable wood screws have a specialized thread and point for fast driving and high clamping force, making them the ideal choice for general and structural timber connections.
What are the benefits of using specialized landscaping screws instead of regular wood screws?
Our landscaping screws offer better protection against rust to keep them safe from moisture and soil chemicals. They often come in darker colors, which makes them visually appealing and gives them the strength they need for raised garden beds, retaining walls, and outdoor wooden structures.
Can your structural timber screws replace bolts and nails?
Absolutely. Certified and engineered for strength, Sinsun's structural timber screws offer superior tensile and shear strength, often replacing traditional fasteners in framing, beams, and trusses for a faster, stronger, and more precise connection.
What features are critical for timber frame screws in construction?
Timber frame screws must have high shear strength, consistent performance under load, and a self-drilling tip. We provide post-and-beam construction screws that ensure reliable and code-compliant connections.
What is a common use for your 100mm Timberlok-style screws?
Our timberlok screws 100mm are perfect for medium-duty framing, securing 2x lumber, and building garden structures like pergolas. They offer excellent grip and strength without the need for pre-drilling.
Why should I consider hex head timber screws?
Sinsun's hex head timber screws allow for high-torque installation using impact drivers or wrenches, preventing cam-out. This is ideal for heavy-duty work, dense wood, or when driving many screws quickly and efficiently.
Where do you recommend using 6 inch timberlok screws?
Our 6 inch timberlok screws (approx. 150mm) are excellent for securing 4x4 posts, building strong deck frames, and other projects requiring deep embedment and high withdrawal resistance in substantial timber.
What makes your timber decking screws prevent surface splitting?
Our timber decking screws often feature a wafer head and a sharp point that cleanly parts wood fibers. This design, combined with correct installation technique, minimizes the risk of splitting composite or hardwood decking boards.
What defines your range of heavy duty timber screws?
Sinsun's heavy duty timber screws are characterized by larger diameters (8mm+), high-grade steel, and robust coatings. They are engineered for maximum load-bearing capacity in primary structural connections and large-scale timber projects.
What type of projects require 300mm Timberlok-type screws?
Projects like securing large retaining wall timbers, heavy timber landscaping features, or constructing with large glulam beams demand the deep penetration and exceptional holding power of our 300mm timberlok screws.
Are your timber roofing screws weather-resistant?
Yes, our timber roofing screws are specifically coated to withstand UV exposure, rain, and temperature extremes. They securely fastress battens or roofing components to timber rafters, ensuring a durable, long-lasting roof assembly.
How do Timberlok-style lag screws improve on traditional lag bolts?
Sinsun's timberlok lag screws function like a giant, threaded screw. Their self-tapping point eliminates the need for pre-drilling a pilot hole in most woods, saving significant time and labor compared to traditional lag bolts and washers.
What is the key feature of a screw designed as an outdoor wood screw?
The defining feature of a genuine outdoor wood screw is superior corrosion resistance. Sinsun's options include stainless steel or specially coated screws that resist rust from moisture and environmental exposure, ensuring the longevity of your outdoor project.
Don't see your question here? Our engineering team is ready to help with your specific timber connection requirements.
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