Fong Prean – Professional Structural Timber Screw and Long Lag Screws Supplier

Fong Prean is a trusted name in the fastening industry, proudly based in Taiwan. Here's why we're the ideal choice for your timber structural screw needs:

• Taiwan-Made Quality and Production Stability
  With nearly four decades of manufacturing experience, Fong Prean delivers consistent, high-quality screws produced entirely in Taiwan. Our production facilities ensure stable output and reliable supply for both small and bulk orders.
• Certified Manufacturing (ISO, CE)
  We maintain stringent quality control systems, certified under ISO 9001, and our structural timber screws are CE marked, meeting EU regulations (e.g. EN 14592).
• OEM/ODM Customization Services
  Need tailor-made solutions? Fong Prean offers comprehensive OEM and ODM structural timber screws and long lag screws services. From head styles and drive types to coatings and thread design, we help you customize fasteners to match specific project requirements.
  

A long hex-head timber structural screw featuring a patented thread design for efficient driving and high strength. These heavy-duty screws come packed with engineering features that distinguish them from ordinary hardware. Below are some key technical features and specifications of Fong Prean’s structural timber screws (and long construction screws in our product line):

• Size Range and Strength: Our structural wood screws are available in a broad range of sizes to fit various structural needs. Diameters typically range from about 5 mm up to 10 mm (approx. #12 up to 3/8″), and lengths from roughly 40 mm to 400 mm (1.5″ up to 15.75″) are offered. (In fact, we produce some long construction screws nearly 40 cm in length for specialty uses!) Made from hardened carbon steel or stainless steel, these screws achieve very high tensile and shear strength, enabling them to handle substantial loads and stresses in beams, joists, and columns. In practical terms, a quality structural screw can rival or exceed the load capacity of a comparable lag bolt while being much easier to install.
• Advanced Coatings & Corrosion Resistance: To ensure longevity, especially in outdoor or humid environments, our screws come with various anti-corrosion coating options. You can choose from zinc galvanization (electroplated), yellow zinc dichromate, Ruspert® ceramic coating, Geomet® zinc-aluminum flake coating, black phosphate, e-coating, and more. These protective finishes shield the screws from rust even when used in pressure-treated lumber or exposed conditions. Combined with stainless steel material options for certain models, the result is excellent corrosion resistance for long-term durability. Whether your project is an outdoor deck in a rainy climate or a timber structure in contact with treated wood, the screws are built to resist weathering and chemical corrosion.
• High Holding Power with Deep Threads: Structural wood screws typically feature deep, aggressive threads (often full-length on long screws) that maximize holding power in wood. The coarse thread profile bites strongly into timber, providing a secure grip that won’t easily loosen or pull out under load. Many of our designs use a patented “Twister” thread geometry that not only grips the wood tightly but also reduces driving friction. This means less torque is needed to drive the screw, which in turn minimizes installer fatigue and even protects power tools from excessive strain. In fact, the Twister thread can improve driving efficiency by up to 60%, allowing faster installation of long screws and less battery wear on your drill. Despite their long length, these screws sink in smoothly and hold with impressive strength along their entire embedment.
• Anti-Splitting Point Design: Driving a long screw into wood can sometimes cause the wood to split, especially near edges or in dense lumber – but our screws are designed to prevent that. Many structural screws (including Fong Prean’s) have self-drilling tips or cut-point tips (like Type 17 points) that carve a path into the wood. This eliminates the need for pre-drilling and reduces the chances of the wood splitting when the screw is driven in. Moreover, the reduced driving torque of our Twister thread means less outward pressure on the wood fibers during installation. As a result, even when fastening close to the end of a timber, these screws greatly reduce splitting of the wood. The combination of a sharp, cutting tip and optimized thread geometry ensures you get a clean installation without cracks, which preserves the integrity and strength of your timber connections.
• Long-Thread Performance (Fully Threaded Screws): For our longest screws and those meant for structural reinforcement, a fully threaded shank is often used – meaning threads run along most of the screw’s length. This enables the screw to pull two timber members tightly together and increases the overall connection strength (since the load is distributed over the entire embedment). Such long structural screws can even replace traditional through-bolts in many cases. For example, in glulam beam assemblies or CLT panel connections, using a series of long self-tapping screws is often faster and aesthetically cleaner than drilling through and bolting. Despite not using nuts, the fully threaded screws provide comparable high load capacity and are approved for structural use. Indeed, modern mass timber construction relies heavily on these long screws – they have been engineered specifically to fasten thick engineered wood members securely while remaining fully code-compliant. The result is a reliable connection without the protrusions or labor of bolt-and-nut installation. In summary, the design of our long construction screws ensures that even at extended lengths, they deliver superior holding strength and efficiency.
  

Structural timber screws and long construction screws are incredibly versatile and are used across a wide range of construction projects. Wherever you need to join wood securely – especially large or load-bearing pieces – these screws are likely to be the ideal fastener. Some key application areas include:

• Timber Frame Construction: In wood-framed buildings (such as residential homes, timber barns, or cabins), structural screws are used to assemble the primary framework. They can fasten studs to top/bottom plates, secure roof rafters and trusses, and attach headers or beams to posts. Unlike nails, structural screws won’t work loose over time and have the strength to resist heavy loads or wind uplift. Builders often use structural screws as an alternative to lag bolts for connecting beams and columns because they install faster (no pre-drilling) while still providing a safe, code-approved hold. Overall, in any post-and-beam or stick-framed structure, these screws help ensure a robust connection at critical joints, contributing to the building’s structural integrity.
• Decks and Outdoor Structures: Outdoor projects like decks, pergolas, gazebos, fences, and footbridges benefit greatly from structural wood screws. For instance, when installing a deck, structural ledger screws are often used to attach the ledger board to the house framing, in place of older-style lag bolts. They also secure beams to posts and joist hangers to ledger or beam faces. Using structural screws in deck construction provides a long-lasting, safe connection that can handle the live loads of people, furniture, and snow. Additionally, the corrosion-resistant coatings on these screws make them suited for exterior use. Many deck builders prefer structural screws because they drive in quickly with an impact driver and don’t require cumbersome wrenches like bolts do. In fact, building experts recommend using structural screws for any load-bearing outdoor structures (such as decks, pergolas, or porch roofs) rather than ordinary screws or nails. The result is an outdoor structure with improved safety and longevity.
• Structural Wood Joinery and Connectors: Wherever wooden members need to be joined together or attached to metal connectors, structural screws provide an efficient solution. Examples include securing joist hanger brackets to beams or ledgers, mounting post bases and beam hangers to support columns, or clamping together multiple plies of a built-up girder. Fong Prean manufactures specialized screws (such as our pan-head Twister thread screws) specifically for joist hangers and angled timber connectors. These screws have a low-profile head that fits within metal connector holes and a conical shape under the head to ensure full contact in the connector. Using screws in these connectors allows for quick installation and a very tight fit. Similarly, when laminating several wooden planks into a thicker beam (e.g. creating a built-up header), long screws can draw the layers together and hold them rigidly – a process much faster than through-bolting. In summary, for structural joinery – be it wood-to-wood or wood-to-metal hardware – structural wood  screws offer high strength and ease of use. They are routinely used in roof truss assemblies, joist-to-beam connections, rafter ties, and various framing hardware to ensure everything stays securely fastened.
• Large-Scale Builds & Engineered Wood (Mass Timber): Structural screws play a pivotal role in modern mass timber construction and other large-scale wood projects. Engineered wood products like glulam beams, LVL (laminated veneer lumber), and CLT (cross-laminated timber) panels often require extremely long fasteners for certain connections. Rather than using long bolts that go through these members, builders now commonly use very long self-tapping screws designed for the purpose. These screws (sometimes 300–600 mm in length or more) can fasten thick CLT panels together or attach steel plates to massive beams with ease. They provide the strength and length needed to secure multi-layer wood panels and thick structural elements. For example, when joining two CLT wall panels or anchoring a CLT floor to a wall, installers drive a series of long structural screws at prescribed angles. The screws cinch the timber elements together tightly, creating a moment-resisting connection. Because they have special coatings and high strength, many of these screws are approved for use in both interior and exterior mass timber applications. Overall, in large-scale timber projects – from multi-story wood buildings to timber bridges – these long construction screws have become indispensable. They simplify construction (no drilling through for bolts), maintain clean aesthetics, and are fully capable of handling the heavy loads in these applications. Builders appreciate that using the right structural screws can reduce labor and ensure code-compliant connections in advanced wood structures.
  

Q: Do Structural Timber Screws require pre-drilling?
A: No. Fong Prean’s structural timber screw products are engineered with self-drilling tips, allowing fast installation while minimizing wood splitting and reducing labor time on-site.

Q: What advantages do structural screws have over traditional lag bolts?
A: Compared to lag bolts or long lag screws, structural timber screws provide similar or greater load capacity but install much faster using only a standard drill. This streamlines construction workflows and reduces overall project effort.

Q: Are Fong Prean’s structural timber screws certified?
A: Yes. Our timber structural screws and long construction screws meet CE standards (EN 14592) and are produced under strict ISO compliance to ensure consistent quality and performance.

Q: Can I order custom structural wood screws?
A: Absolutely. Fong Prean offers complete OEM/ODM manufacturing support, enabling you to customize structural timber screw dimensions, coatings, thread designs, and drive types to meet your exact project requirements.

Q: What exactly is a Long Lag Construction Screw?
A: Long construction screws are extended-length versions of structural timber screws, often reaching 300–400 mm or longer. They deliver deep penetration and superior pull-out strength, making them ideal for thick timber beams, multi-layer assemblies, and engineered wood structures.