Drywall, Self-Tapping & Self-Drilling Screws â Sourcing from China
Overview
Screw production in Yongnian spans from high-volume drywall screws to specialized self-drilling metal roofing screws. HDBolt sources across the full screw range, with attention to point geometry, thread design, and surface finish â all of which affect real-world performance.
Specifications
| Main Types | Drywall screw (fine & coarse thread), Self-tapping screw, Self-drilling (Tek) screw, Chipboard screw, Wood screw, Machine screw |
|---|---|
| Head Types | Bugle, Flat, Pan, Hex washer, Truss, Round, Countersunk |
| Drive Types | Phillips (PH2), Pozidriv (PZ2), Torx (T25/T30), Slotted, Hex, Robertson |
| Coating | Black phosphate, Grey phosphate, Zinc plated, Yellow zinc, Dacromet, Ruspert, Geomet |
| Size Range | #6 â #14 / M3 â M6.3 Ã 10mm â 200mm |
| Packaging | Bulk cartons, 1 lb / 5 lb jars, 1000 pc boxes, blister packs |
Frequently Asked Questions
What is a self-drilling (Tek) screw?
A self-drilling screw, often called a Tek screw, has a drill-point tip that allows it to drill its own hole in metal without a pilot hole. The point is followed by a cutting thread and then a seating thread. Tek screws are graded by point size (#1 to #5), which determines the maximum metal thickness they can drill through â for example, a #3 point typically handles up to 4.5 mm of steel.
What coating should I choose for outdoor use?
For outdoor or high-corrosion environments, zinc plating alone is usually insufficient. Better options include hot-dip galvanized (HDG, for large screws), Dacromet, Ruspert (common on metal roofing screws), or stainless steel 304/316. Ruspert coating, rated at 1000+ hours salt spray resistance, is particularly popular for self-drilling screws used on metal roofing and cladding.
Can you supply colored-head screws to match roof panels?
Yes. Colored heads â baked polyester paint in RAL colors â are a standard option for self-drilling roofing screws. Minimum quantities for custom RAL colors typically start at 50,000 pieces per color.
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