ZINC PLATED EXTRA COUNTERSUNK
LONG WOOD SCREW 6MM*200MM
Drive Deep for Maximum Grip in Timber and Beams.
Replace Lag Bolts with Faster, Stronger One-Step Installation.
Engineered for the Heaviest Wood-to-Wood Connections.
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Sinsun Long Wood Screws | Heavy-Duty Fasteners for Timber, Decking & Framing | 4"-12" Lengths
Need deep penetration & maximum hold? Sinsun offers premium long wood screws for posts, beams, ledger boards & heavy timber. High-strength, corrosion-resistant. Get a quote for your project.
Get a Quick QouteSinsun Long Wood Screws: The Foundation of Heavy-Duty Woodworking
In some cases, surface-level fasteners are not enough. Instead, you need a solution that penetrates deep into your material.Sinsun Long Wood Screws are designed for jobs that regular screws cannot do, like holding ledger boards, laminating beams, attaching posts, and building heavy timber frames. These screws have the remarkable shear strength and withdrawal resistance needed to make permanent, structural-grade connections in wood.
Our long screws are a faster, more reliable alternative to lag bolts and through-bolts because they are made of hardened steel, have aggressive threading, and can be used with a variety of drive systems.For professionals who need to ensure that their projects connect deeply, they're the perfect choice.
Core Benefits & Pain Points Solved
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Unmatched Holding Power for Structural Integrity
Designed with a thicker shank and deep, sharp threads to maximize grip over their entire length. They provide withdrawal resistance exceeding 600 lbs per inch in many wood types, ensuring connections that resist heavy loads and seasonal wood movement.
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Faster Than Traditional Lag Bolts
Pre-drilling, washering, and nuting have never been easier than with lag bolts. Drive directly with an impact driver or drill for a one-step installation that cuts connection time by up to 60%, streamlining your build process.
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Built for Longevity, Indoors and Out
Available in a range of protective finishes. Choose from weather-resistant coated steel for outdoor framing or A4-316 stainless steel for direct ground contact and highly corrosive environments, such as coastal areas, cedar, ACQ lumber). As a result, rust is prevented, and decades of reliable performance are ensured.
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Driver-Friendly Design for High Torque
Features a Torx T30/T40 or Heavy-Duty Hex drive to withstand the high torque needed for long-length installation without cam-out or stripping. It ensures that every screw can be driven to its full depth and clamping force.
| Parameter | Specification |
| Product Type | Long Wood Screw / Structural Wood Screw |
| Available Lengths | 3", 4", 5", 6", 8", 10", 12" (Custom lengths available on request) |
| Diameters (Gauge) | #9, #10, #12, "(Shank diameters from approx. 4.2mm to 6.3mm) |
| Material | High Carbon Steel (Case Hardened), Stainless Steel (A2-304, A4-316) |
| Finish/Coating | Zinc Plated with Yellow Chromate, Hot-Dip Galvanized, Ceramic Coated, Plain Stainless |
| Drive Type | Torx T30, Torx T40, Hex Washer Head #3/#4 |
| Head Style | Flat Head, Washer Head, Hex Head |
| Thread | Full or Partial Thread, Coarse Pitch for Superior Wood Grip |
| Point Type | Sharp Self-Starting Point, Some with Auger Point for chip removal |
7 inch long wood screws
8 inch long wood screws
6 inch long wood screws
5 inch long wood screws
10 inch long wood screws
14 inch long wood screws
4 inch long screws
MAIN USES
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Get a Quick Qoute
Ledger Board Attachment
The most crucial link for decks. It requires screws that are long enough to go at least 3" into the solid wood framing of the house .
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Beam Lamination and Sistering
This involves combining more than one layer of dimensional lumber (like 2x10s and 2x12s) to make beams stronger than ones that are broken.
Inside the Factory:
Precision Manufacturing
Go behind the scenes at Sinsun to witness the precision engineering and advanced manufacturing behind our long wood screws. This video takes you through the production journey—from high-grade steel wire to the finished, heavy-duty fastener.
Get a Quick Qoutesinsun fastener
Case Type |
Client / Project Background |
Core Pain Point / Need |
Sinsun Solution & Experience |
Quantifiable Benefit / Verdict |
Heavy Timber Construction |
“EverTimber Timber Framing Co.”, specializing in large outdoor pavilions and cabin frames. |
Needed to securely fasten 10x10 inch laminated beams. Traditional bolting was time-consuming and risked damaging the wood. |
Used 200mm long Sinsun hex-head structural wood screws. The self-drilling point eliminated pre-drilling. The high-strength carbon steel construction ensured reliable load-bearing capacity. |
“Installation was about 40% faster compared to old methods. The connection is rock-solid, and the coating shows no rust after a year of exposure.” |
High-End Custom Furniture |
“Atelier Fine Woodworking”, crafting premium solid wood tables and bookshelves. |
Required strong, hidden joints in dense hardwoods (oak, walnut) without causing splits. Standard screws were insufficient. |
Chose 100-150mm Sinsun flat-head / round-head wood screws. They allow for completely concealed fastening. The specialized cutting thread design minimized wood fiber tearing. |
“Achieved the ‘invisible’ aesthetic our clients demand. The holding power exceeds expectations, and we’ve seen a reduction in material waste from splitting.” |
Outdoor Deck & Critical Structure |
“Coastal Deck & Rail Systems”, working in humid, coastal environments. |
The critical deck ledger board attachment must be extremely strong and corrosion-resistant to ensure long-term safety. |
Specified Sinsun 304/316 stainless steel long screws (custom lengths). The stainless steel is engineered for high humidity and outdoor use, providing superior rust prevention. |
“These screws are the foundation of our 30-year structural warranty. They have eliminated callbacks related to fastener corrosion or failure, fully protecting our reputation.” |
Ready to Secure Your
Most Demanding Projects?
Deep connections require the right fastener. Don't compromise on strength or speed.
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Get a Custom Quote for Your Project Lengths
Tell us your needs for volume pricing.
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Consult on Your Specific Structural Application
Our experts can recommend the ideal diameter, length, and coating.
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Request Free Sample Screws
Test the holding power and drive performance yourself.
Keep In Touch
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