Key Benefits
Integrated Drill Point
Reduces installation time by eliminating pre-drilling in thin metal up to 3 mm.
Wide Truss Head Bearing
In thin-sheet applications, wide head profile minimises surface pressure and pull-through.
Phillips Cross-Drive Compatible
Common power tools engage quickly and securely with Phillips #2 and #3 recess heads.
Zinc-plated, black phosphate, and stainless steel finishes for indoor, outdoor, and corrosive environments.
Complete Metric and Imperial Range
#6 to #14 (ST3.5 to ST6.3), varied thread counts and lengths for diverse assembly needs.
Custom head styles, thread specs, materials, and branding are available for high-volume orders from KEY-CNC.
Drilling & Fastening Capacity
|
Drill Point |
Max Drilling Capacity |
Recommended Speed |
|
Type 25 (Thin Sheet) |
1.5 mm steel |
2,000–3,000 RPM |
|
Type AB (Multi-Purpose) |
2.5 mm steel |
1,800–2,500 RPM |
Applications
Steel Framing and Construction
Applied to commercial and residential framing to attach steel studs, purlins, and sheet metal. The self-drilling tip cuts steel without pilot holes, accelerating installation.
HVAC/Ductwork
Secure duct flanges, acoustic panels, and HVAC housing. Flush, aerodynamic truss heads reduce air turbulence in duct systems.
Electrical Enclosures
Attaches junction boxes, panel covers, and conduit brackets to metal framing. In damp or outdoor electrical systems, corrosion-resistant coatings protect connections.
Cabinet and Furniture Making
Fits thin-gauge steel brackets, hinges, and ornamental panels in metal furniture and commercial cabinetry. Drive depth consistency ensures clean, professional results.
Auto & Transport
Used to affix body panels, trim, and underbody components. High shear strength and vibration resistance protect joints in harsh conditions.
Frequently Asked Questions
Q: What is the difference between a self-tapping screw and a self-drilling screw?
A: A self-tapping screw (often called a TEK screw or self-drilling screw) has a built-in drill point that creates its own pilot hole as it is driven in, eliminating the need for pre-drilling. Standard self-tapping screws rely on the material itself to form threads and do not drill through metal.
Q: Which drill point type do I need?
A: Type 17 is best for thin sheet steel up to 3 mm. Type 25 is ideal for ultra-thin gauges. Type AB is the most versatile multi-purpose choice.
Contact KEY-CNC for a recommendation based on your substrate.
Q: Can I get custom head styles or non-standard lengths?
A: Yes. As a dedicated self-tapping fasteners China manufacturer, we offer custom head styles, materials (stainless steel, carbon steel), thread configurations, and branding for OEM orders.
Q: What surface finish should I choose for outdoor use?
A: For outdoor or marine environments, we recommend stainless steel 304/410 or Ruspert-coated finish for superior corrosion resistance. Zinc-plated is suitable for indoor and dry conditions.
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