Philips Modified
Truss Head Wood Screws
Wide head prevents pull-through, low-profile fit.
Secures thin sheet materials evenly, no deformation.
Engineered for fast, professional assembly every time.
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Sinsun Truss Head Wood Screws: The Low-Profile, High-Clamp Solution
Expertly engineered Sinsun Truss Head screws combine a low profile with a wide bearing surface. Perfect for sheet metal to wood, electrical boxes, and panels. Prevent pull-throughs and ensure secure hold.
The Sinsun Truss Head Wood Screw is made for jobs that need a lot of clamping force but can't have a head that sticks out. The head of this screw is wider than a flat head and has a slight dome shape. At the same time, its profile is lower than that of a standard pan head. This design gives the bearing a bigger surface area, which helps spread the force evenly and stops softwood, plastic, and thin metal sheets from bending and penetrating.
These screws are made of low-carbon steel (surface-hardened) or corrosion-resistant stainless steel (A2-304) and are strong enough for most uses. Most of the time, these come in sizes #6 to #10 and lengths from 1/4 inch to 1-1/2 inches. These screws are used to make strong, non-loosening joints in the electrical, HVAC, and manufacturing industries. They have a sharp point, coarse wood threads, and standard Phillips or Pozidriv drive slots.
| Parameter | Specification | Functional Implication |
| Head Diameter | Typically 1.5x to 2x the screw shank diameter. | Maximizes clamping surface area to secure thin materials without tearing through. |
| Head Height | Lower profile than a standard round head of equivalent diameter. | Maintains a low, snag-free profile while providing superior load distribution. |
| Drive Types | Torx (T15, T20, T25, T30), Phillips (#2, #3). | Ensures high torque transfer for secure seating without head damage. |
| Point Type | Sharp needle point or self-drilling (Type 17) point. | Facilitates easy starting and penetration, minimizing the need for pilot holes in assembled materials. |
| Thread | Coarse or fine thread options, often fully threaded. | Provides maximum grip along the entire shank in pre-drilled or thin-section applications. |
| Material | Low-Carbon Steel, Stainless Steel (A2/A4), Brass. | Selected for strength and environmental compatibility (corrosion resistance). |
| Common Diameters | #6, #8, #10, 1/4". | Covers a range from light-duty electronic enclosures to medium-duty structural panels. |
| Common Lengths | 1/4" to 2" (6mm to 50mm). | Optimized for fastening materials from thin gauge sheets up to ~3/4" thick assemblies. |
Sinsun Truss Head Wood Screws – Core Advantages
Maximum clamp & hold.
With its signature low-profile, wide-diameter head, its friction-free surface contact prevents pull-through and ensures a secure, lasting connection, especially in softer materials.
Engineered Anti-Slip & Stability
The underside of the screw is precision-milled to resemble a star washer (ribbed bearing surface integrated throughout). Compared to standard flat-head screws, this design is more durable and reliable, and resists loosening even when vibrations occur or loads shift.
Optimized for efficiency & finish
Installing this Torx drive is quick and easy, and the finished product looks neat and flush, so nothing will get caught in it. With a low-crown head, the final product is free from cam-out.This speeds up production and assembly.
Expert-Grade Durability
Sinsun Truss Head Screws are made of high-quality steel and have a finish that resists rust (like zinc plating or other coatings). They are built to last in tough situations, like HVAC and electrical installations, outdoor furniture, and fixtures.
Sizes & Usage Guide
Complete size specs for Truss Head Wood Screws help you choose the right fastener. Learn key differences and best applications to make confident decisions for your woodworking projects.
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| Gauge (Size) | Common Lengths | Head Diameter (Approx.) | Drive Type | Standard Finish |
| #6 | 1/2", 3/4", 1" | 8.0 mm | Phillips #2, Pozidriv PZ2 | Zinc Plated, Yellow Zinc |
| #8 | 3/4", 1", 1-1/4" | 9.5 mm | Phillips #2, Pozidriv PZ2 | Zinc Plated, Yellow Zinc, Stainless |
| #10 | 1", 1-1/4", 1-1/2" | 11.0 mm | Phillips #2, Pozidriv PZ2 | Zinc Plated, Hot-Dip Galvanized, Stainless |
This table clarifies the best application for a Truss Head versus other common low-profile heads.
| Feature | Truss Head | Pan Head | Flat Head (Countersunk) | Wafer Head |
| Profile | Low-profile, wide dome | Moderate-profile, rounded dome | Flush (when countersunk) | Very low-profile with wide washer |
| Bearing Surface | Very Wide | Wide | Small (angled) | Extremely Wide (integrated washer) |
| Primary Use Case | Sheet metal to wood, electrical boxes, thin panels | General hardware attachment | Flush finish in furniture/cabinetry | Decking, fencing, roofing (soft materials) |
| Key Advantage | Excellent clamp distribution without high profile | Good strength & common availability | Invisible, smooth finish | Prevents pull-through in softest materials |
| Material Protection | Excellent for thin metal/plastic | Good | Good (when flush) | Best for composite/softwood |
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HVAC & Electrical Installation
Sinsun Truss Head Screws are used in commercial HVAC work to attach 26-gauge (0.5mm) sheet metal ductwork.
They keep ducts sealed even when static pressure is up to 4 inches of water column.
The wide head completely covers the 3/8" mounting flange, so there won't be any tears during installation or system vibration over a 20+ year service life.
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Subfloor & Roof Sheathing Fastening
Subfloors of 3/4-inch OSB or plywood are secured to 2x10 wood joists. They are spaced 6 inches apart along the edges of the panels and 12 inches apart in the field, as per the International Residential Code (IRC).o IRC code).
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he 15mm diameter of the bearing surface prevents the head from sinking into the panel. This allows 1/32" of the critical gap to remain open for expansion.
It supports 70 pounds of live load per square foot, which is required for residential construction, so you no longer have to worry about squeaky floors.
It supports 70 pounds of live load per square foot, which is required for residential construction, so you no longer have to worry about squeaky floors.
Heavy-Duty Fixture & Signage Mounting
Engineers say that when you put up a 15-foot LED sign outside on a wooden frame, you should use Truss Head screws.
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The sign will weigh about 200 pounds in the wind. A pattern of four #12 x 2.5" screws can safely distribute the dynamic load.
The ribbed bottom keeps 90% of the pre-load tension even after wind gust tests at 75 mph. This is better than regular fasteners, which can come loose by up to 40%.Learn More
Joinery for furniture and cabinets
A Truss Head screw has more than 50% more withdrawal resistance than a standard flat head screw of the same shank diameter.
This is when used to attach 1/2" thick cabinet backs to 3/4" solid wood frames.
This is when used to attach 1/2" thick cabinet backs to 3/4" solid wood frames.
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What Our Industrial Clients Say
We manufacture modular retail display systems using thin powder-coated aluminum panels. While standard truss heads already performed exceptionally well, NewShun's enhanced design revolutionized the field by refining the head angle and incorporating a serrated support surface. This serrated structure interlocks with the coating, eliminating rotational movement during installation.A smoother, flatter surface finish is also delivered by the improved contour, which resolves production line alignment issues.
"Having visible fasteners on the stainless steel fronts and cedar panels of our high-end outdoor kitchen line was a big design mistake. The solution was Sinsun's black truss head screws. Black oxide has become a design feature among our clients due to its long-lasting qualities and sharp contrast. The wide head is particularly important because it prevents any pull-through on the thin cedar trim. They look professional and have been outside for three years without any issues."
FAQ
When should I use a Truss Head instead of a standard Flat Head screw?
A: Use a Truss Head when fastening thin or soft materials (like sheet metal, plywood, or plastic) to wood. Its wider diameter head provides a larger bearing surface to prevent pull-through and distribute clamping force more effectively.
What is the main advantage of the ribbed underside?
A: The ribbed, serrated underside bites into the material surface during tightening. This creates a locking effect that resists loosening from vibration, making it ideal for machinery, vehicles, or outdoor structures.
Can I use a washer instead of a Truss Head screw?
A: While a washer adds surface area, a Truss Head is an integrated, one-piece solution. It is more efficient, provides consistent performance, and the ribbed underside offers superior anti-rotation compared to a separate smooth washer.
Are they suitable for outdoor projects?
A: Yes, when you select the correct material. Our zinc-plated screws are good for protected outdoor use, while our 304 or 316 stainless steel options are essential for direct exposure to weather or corrosive environments to prevent rust.
What driver bit do I need?
A: Sinsun Truss Head screws are compatible with Torx (star) drive bits (typically T20, T25, or T30, depending on size). This provides greater torque transfer and reduces the risk of cam-out and driver slippage compared to Phillips.
Do I need to pre-drill a pilot hole?
A: For best results, especially in hardwoods or near edges, we recommend pre-drilling a pilot hole slightly smaller than the screw's shank diameter. This prevents splitting and ensures easier, straighter installation with less driver strain.
How do I choose the right length?
A: The screw should be long enough to penetrate the material you are fastening into by at least 1 inch (25mm) for a strong hold. Example: To attach 1/2" plywood to a 2x4, a 1.5" to 2" screw is ideal.
What are your most popular sizes?
A: Our most common sizes for general use are #8 x 1" (for light fixtures), #10 x 1.5" (for HVAC/electrical), and #12 x 2" or 2.5" (for structural framing and heavy-duty mounting). We offer full dimensional specifications for each product.
Next Steps for Your Project
Identify Your Materials
Determine the thickness of the metal and wood you are joining.
Select Size
Choose a screw length that penetrates at least 3/4" into the primary wooden support. The gauge should be appropriate for the load.
Choose Finish
For indoor electrical/panel work,zinc-plated is standard. For exterior or corrosive environments (like some mechanical rooms), specify hot-dip galvanized or stainless steel.
Need engineering support for a specific load or material combination?
[Contact Sinsun's technical team] for application-specific guidance.
[Get a quote for bulk OEM quantities] with custom packaging.
Sinsun Truss Head Screws: Engineered to clamp wider, sit lower, and hold tighter.
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