The Cap-Tor xd solves the mushrooming problem that ruins composite decking installations. This specialized fastener features reverse threading that pulls material back into the hole and an undercut head design that slices through the hard outer layer of composite boards — eliminating those ugly raised bumps around screw heads that plague standard deck screws.
For Montana contractors building 500+ square foot composite decks, the 1,750-piece bulk pack makes economic sense. Each pack covers approximately 500 square feet based on standard 2 screws per joist crossing. The #34 Saddle color matches multiple major decking brands, saving contractors from stocking different colors for different jobs.
The Anti-Mushrooming Technology That Actually Works
The Cap-Tor xd technology combines reverse threading with an undercut head design and tri-lobular shank. Here’s why each element matters:
The reverse thread on the upper portion acts differently than standard screws. As you drive the screw, the reverse threading pulls material back into the hole rather than pushing it up and out. No more volcanic eruptions of composite material around each fastener.
The undercut head slices through the hard capstock layer cleanly instead of bulldozing through it. Standard screws compress and deform this tough outer shell. The Cap-Tor cuts it.
The tri-lobular shank reduces driving friction, which means less torque on your impact driver and longer battery life — measurable benefits when you’re sinking 3,500 screws on a large deck.
| Specification | Value |
|---|---|
| Length | 2-3/4 inches |
| Size | #10 |
| Material | Epoxy-coated Carbon Steel |
| Coating | Color-matched epoxy (#34 Saddle) |
| Drive Type | T-20 Star Drive (Torx) |
| Thread Design | Reverse-thread upper, Tri-lobular shank |
| Tip Style | Type 17 Auger Tip |
| Quantity | 1,750 pieces |
| Coverage | ~500 square feet |
The Type 17 Auger Tip self-drills and reduces splitting, though pre-drilling is still recommended when fastening within 1 inch of board ends.
Color Matching and Brand Compatibility
The #34 Saddle color isn’t random. This color matches Trex Saddle, Fiberon Brown and Jasper, TimberTech Legacy/PRO colors, and EverGrain Saddle. One screw color handles the most popular brown-toned composite decking lines.
The epoxy coating provides superior corrosion resistance — critical for Montana’s freeze-thaw cycles. These screws are ACQ approved for use with pressure-treated lumber, so they won’t corrode when used with modern treated framing.
Professional contractors praise the clean finish and lack of mushrooming, noting the strong drive with T-20 bits and excellent color match. The trade-off? Slightly higher cost than basic screws.
Installation Considerations for Montana Contractors
The extra-deep star drive recess prevents cam-out and stripped heads. But here’s the catch: T-20 drive bits are typically sold separately or included only in smaller retail packs — check whether they’re included in the bulk pack before ordering.
Starborn’s Smart-Bit Depth Setter (sold separately) ensures perfectly flush installation. Worth considering for large jobs where consistent depth matters.
Standard fastening pattern is 2 screws per joist crossing, and you should drive flush with the surface — don’t overdrive as it may compromise the capstock.
For Montana’s climate, the epoxy coating handles the moisture swings from spring snowmelt through summer drought. The ACQ approval means these work with the pressure-treated lumber that’s standard for ground-contact deck framing.
The Bottom Line
Cap-Tor xd technology delivers what it promises — no mushrooming on composite decking. The 1,750-piece bulk pack suits contractors tackling larger Montana ranch and recreation property decks. At roughly 3.5 screws per square foot of decking, this pack handles a 500-square-foot deck with some left over for waste and repairs.
The reverse threading and undercut head aren’t gimmicks. They solve real installation problems that standard screws can’t touch. Combined with the #34 Saddle color that matches major decking brands, these screws eliminate callbacks for unsightly screw bumps while maintaining the color continuity customers expect.
Not the cheapest option. But for contractors who understand that fastener failures create expensive callbacks, the Cap-Tor xd earns its premium through genuine performance advantages.
Frequently Asked Questions
Q: What makes Cap-Tor xd screws different from regular deck screws on composite decking?
Cap-Tor xd screws feature reverse threading that pulls material back into the hole, eliminating the mushrooming (raised bumps) that standard screws create on composite decking. The undercut head design slices cleanly through the hard capstock layer instead of bulldozing through it like conventional screws.
Q: How many square feet will the 1,750-piece Cap-Tor bulk pack cover?
The 1,750-piece Cap-Tor bulk pack covers approximately 500 square feet of decking based on the standard installation pattern of 2 screws per joist crossing. This coverage assumes typical 16-inch on-center joist spacing.
Q: What decking brands does the #34 Saddle color match?
The Cap-Tor #34 Saddle color matches Trex Saddle, Fiberon Brown and Jasper, TimberTech Legacy/PRO colors, and EverGrain Saddle. This single color works with multiple major composite decking brands’ brown-toned lines.
Q: Do I need special bits to drive Cap-Tor xd screws?
Cap-Tor xd screws require T-20 Star Drive (Torx) bits, which are typically sold separately or included only in smaller retail packs — not always in the 1,750-piece bulk pack. The extra-deep star drive recess prevents cam-out and stripped heads during installation.
Q: Are Cap-Tor screws safe to use with pressure-treated lumber?
Yes, Cap-Tor screws are ACQ approved for use with Alkaline Copper Quaternary pressure-treated lumber. The epoxy coating provides corrosion resistance that prevents the screws from degrading when used with modern treated framing materials.
Q: Should I pre-drill when using Cap-Tor deck screws?
Pre-drilling is recommended when fastening within 1 inch of the end of a board to prevent splitting, even though Cap-Tor screws feature a Type 17 Auger Tip for self-drilling. For fastening in the field of boards, the auger tip eliminates the need for pre-drilling.
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