Mod’s modified truss head TEK screws eliminate pre-drilling in light-gauge metal while providing a wider bearing surface than standard pan heads. These #8 diameter screws handle metal-to-metal fastening where pull-through matters and time costs money.
Self-Drilling Design Saves Time
The TEK point drills its own hole through light-gauge steel and aluminum, typically up to 12-14 gauge metal. Running at 2,500-3,000 RPM with steady pressure, the drill point cuts cleanly without slipping. That’s minutes saved on every connection compared to pre-drilling pilot holes.
The Phillips #2 drive works with standard bits and reduces cam-out compared to slotted drives. Every contractor has PH2 bits in their pouch. No special tooling needed.
Applications span from HVAC ductwork assembly to attaching metal lath for stucco work, general sheet metal fastening, and even cabinet assembly where low-profile heads matter. In Montana’s commercial construction market, these screws see heavy use in metal buildings and agricultural structures where contractors need reliable metal-to-metal connections.
Modified Truss Head Prevents Pull-Through
The modified truss head (also called round washer head or lath screw) provides larger bearing surface than standard pan heads, preventing material pull-through in thin materials. Head diameter ranges from 0.384 to 0.450 inches with a low profile height around 0.102 inches.
This semi-flush finish creates a clean appearance for visible applications. Compare that to hex head TEK screws that offer higher torque capacity but stick out like a sore thumb. The modified truss design splits the difference — enough bearing surface to prevent pull-through without the bulk of a hex head.
| Specification | Value |
|---|---|
| Diameter | #8 |
| Length | 1/2 inch (12.7 mm) |
| Thread Type | Full thread, 15-18 TPI |
| Head Diameter | 0.384-0.450 inches |
| Head Height | ~0.102 inches |
| Drive Type | Phillips #2 |
| Point Type | TEK/Self-drilling |
| Material | Steel |
| Finish | Zinc plated |
The zinc plating provides basic corrosion resistance for interior and limited exterior use. It’s not stainless, but it’ll handle Montana’s dry climate in protected applications. For exposed exterior use or high-moisture environments, step up to stainless or consider a different coating.
Sold in bulk packages from 100-count jars up to 5,000-count master cartons. Buy what you need for the job or stock up for ongoing metal work.
Bottom Line
These screws meet ASTM C1513 specifications for steel self-drilling tapping screws. They’re workhorses for metal-to-metal connections where time matters and bearing surface prevents damage. Skip them for heavy gauge steel beyond their drilling capacity or where you need weather-resistant stainless.
For Montana contractors working with metal buildings, HVAC systems, or light-gauge framing, Mod’s modified truss TEK screws deliver. The self-drilling point saves labor. The wider head prevents pull-through. The zinc coating handles indoor use and protected exterior applications. Keep a box on the truck.
Frequently Asked Questions
Q: What gauge metal can Mod’s #8 TEK screws drill through?
Mod’s #8 x 1/2” TEK screws can self-drill through light-gauge steel and aluminum, typically up to 12-14 gauge thickness. For heavier gauge metal, you’ll need to pre-drill pilot holes or switch to a heavier-duty screw.
Q: What’s the difference between Mod’s modified truss head and a standard pan head screw?
Mod’s modified truss head has a larger bearing surface (0.384-0.450 inch diameter) compared to standard pan heads, which prevents the screw from pulling through thin materials. The low-profile design (approximately 0.102 inches high) also provides a semi-flush finish for cleaner-looking installations.
Q: What drill speed should I use for Mod TEK screws?
Run Mod TEK screws at 2,500-3,000 RPM with steady pressure to ensure the drill point engages and cuts correctly. Keep your driver aligned with the screw axis to prevent the bit from slipping or wandering.
Q: Are Mod’s zinc-plated TEK screws suitable for exterior use?
Mod’s zinc-plated TEK screws provide basic corrosion resistance suitable for interior applications and limited exterior use in protected areas. For exposed exterior applications or high-moisture environments, you’ll need stainless steel screws or a more weather-resistant coating.
Q: What size packages do Mod TEK screws come in?
Mod TEK screws are sold in bulk packages ranging from 100-count jars for small jobs up to 5,000-count master cartons for contractors who use them regularly. Common pack sizes include 269-count boxes, 510-count packages, and 1,345-count boxes.
Q: What driver bit do I need for Mod modified truss screws?
Mod modified truss screws use a standard Phillips #2 (PH2) drive, compatible with any #2 Phillips screwdriver or power drill bit. The Phillips drive reduces cam-out compared to slotted drives and works with bits every contractor already carries.
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