Hex Washer Head Self-Tapping Screws for Timber and Thin Metal
The hex washer head self-tapping screw forms its own thread as it drives — a sharp Type-17 needle point or gimlet tip bites into timber and thin metal sections without pre-drilling. The wide washer head spreads the clamp load and carries an optional EPDM seal for weather-exposed joints. A versatile, vibration-resistant fastener supplied by a self-tapping screw manufacturer serving construction, fencing and general fabrication.
Features and Benefits
- Type-17 needle point and coarse tapping thread — fast installation into timber and thin gauge steel
- Wide hex washer head increases bearing area on soft or thin materials
- Zinc, yellow zinc and CR-10 finishes cover indoor, outdoor and corrosive service
- Consistent heat treatment delivers high stripping torque with a ductile core
- Full size range from #6 to #14 from one manufacturer — one supplier for mixed schedules
Typical Applications
- Timber framing, battens and purlins (softwood and most hardwoods)
- Fencing, pergolas and garden structures
- Thin-gauge steel and aluminum sheet assembly
- HVAC ducting, cable trays and equipment panels
- Retrofit and maintenance work where only one-side access is available
Model Specifications
| Thread Size | Point Style | Length Range | Drive | Finish Options |
|---|---|---|---|---|
| #6 (3.5 mm) | Type-17 / gimlet | 13-50 mm | 5/16 in. hex | Zinc, YZ, CR-10 |
| #8 (4.2 mm) | Type-17 / gimlet | 16-65 mm | 5/16 in. hex | Zinc, YZ, CR-10 |
| #10 (4.8 mm) | Type-17 / gimlet | 19-75 mm | 5/16 in. hex | Zinc, YZ, CR-10 |
| #12 (5.5 mm) | Type-17 / gimlet | 25-100 mm | 8 mm hex | Zinc, YZ, CR-10 |
| #14 (6.3 mm) | Type-17 / gimlet | 25-100 mm | 8 mm hex | Zinc, YZ, CR-10 |
Material and Performance
- Material: 1022A carbon steel, case-hardened and tempered
- Core hardness HRC 32-40 — strong threads that tolerate racking and vibration without snapping
- Zinc plating for dry indoor use; CR-10 organic coating graded C3 / C4 for exposed and coastal sites
- Optional EPDM washer for roof, wall and outdoor joints needing a weather seal
Installation Guidelines
- Drive with a hex socket at moderate speed, keeping firm pressure so the point stays engaged.
- In softwood no pilot hole is required; for dense hardwoods near the point end, pre-drill 70% of root diameter.
- Let the thread pull the joint tight — stop when the washer seats, before the head crushes the timber surface.
- In thin metal, ensure at least two full threads engage beyond the far side for pull-out strength.
- Choose the coating to match the exposure: zinc indoors, CR-10 outdoors or in corrosive atmospheres.
Why Source from BuildFastener
One factory covering the full #6-#14 range means consistent head tolerances and driving feel across every size. Boxes are labeled with size, finish and lot number for full traceability. Contact us for wholesale pricing and mixed-container consolidation.
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