Products Description
At Sunning Industries, screws are more than just simple fasteners; they are precision-engineered components that ensure the structural integrity of your projects. With over 20 years of manufacturing expertise in Handan and a global service hub in Zhengzhou, we produce a diverse range of screws that meet the highest DIN, ISO, and ANSI standards.
Our screws are trusted by professional contractors and industrial buyers across Europe, America, the Middle East, and the CIS region for their sharp points, consistent threads, and high torque resistance.
High-Performance Screw Solutions
We offer a comprehensive selection of screws designed for wood, metal, and multi-material applications. Every batch undergoes rigorous "drive tests" to ensure they penetrate materials without snapping or stripping.
1. Wood & Construction Screws
From heavy-duty timber construction to delicate cabinetry, our wood screws feature optimized thread geometries to prevent wood splitting while providing maximum grip.
Table 1: Common Wood & Chipboard Screw Standards
| Screw Type | Standard | Drive Type | Features |
| Chipboard Screw | DIN 7505 | Pozidriv / Torx | Double countersunk head, sharp point |
| Wood Screw | DIN 97 / DIN 7997 | Slotted / Phillips | Classic tapered thread for timber |
| Hex Head Coach Screw | DIN 571 | Hexagon | Heavy-duty load bearing in wood |
| Decking Screw | ANSI/ASME | Torx (Star) | High corrosion resistance (C4/C5) |
2. Self-Drilling & Self-Tapping Screws
Designed for the metal building and HVAC industries, our self-drilling screws (Tek screws) eliminate the need for pre-drilling, saving significant labor time on the job site.
Table 2: Metal Screw Performance Specifications
| Application | Standard | Point Type | Material / Coating |
| Self-Drilling (Steel) | DIN 7504 | #2, #3, #5 Drill Point | Case Hardened Steel / Ruspert |
| Self-Tapping (Sheet) | DIN 7981 / 7982 | Pointed / Blunt | Stainless Steel / Zinc Plated |
| Drywall Screw | ASTM C1002 | Bugle Head / Sharp | Black Phosphated / Grey Phos |
| Window Screw | Factory Std | Hi-Lo Thread | Zinc / Yellow Zinc |
3. Dimensional Reference for Standard Machine Screws
For industrial assembly, our machine screws provide the precision required for tapped holes and nut assembly.
Table 3: Metric Machine Screw Dimensions (DIN 7985 / ISO 7045)
| Nominal Size | Head Diameter (mm) | Head Height (mm) | Thread Pitch (mm) |
| M3 | 6.00 | 2.40 | 0.50 |
| M4 | 8.00 | 3.10 | 0.70 |
| M5 | 10.00 | 3.80 | 0.80 |
| M6 | 12.00 | 4.60 | 1.00 |
The Sunning Industries Advantage
Heat Treatment Excellence: Our screws are case-hardened in our Handan facility to achieve the perfect balance of surface hardness and core ductility.
Corrosion Resistance: We offer specialized coatings including Ruspert (1000h+ salt spray) and Dacromet for extreme outdoor environments.
Torque Consistency: Precision-formed drive recesses (Torx, Phillips, Pozi) ensure that power tools engage perfectly, reducing "cam-out" and tool wear.
Professional Q&A
Q: What is the difference between a Self-Tapping and a Self-Drilling screw?
A: A Self-Tapping screw (DIN 7981) requires a pre-drilled pilot hole; it "taps" its own thread as it is driven. A Self-Drilling screw (DIN 7504) has a tip shaped like a drill bit, allowing it to drill, tap, and fasten in a single operation without a pilot hole.
Q: Why do you recommend Phosphated coatings for drywall screws?
A: Black or Grey Phosphate coatings provide a textured surface that improves the adhesion of joint compound (mud) and paint. They also provide sufficient corrosion resistance for interior environments while being more cost-effective than zinc plating.
Q: Can you provide screws with a specific drill capacity for thick steel (over 12mm)?
A: Yes. While standard #3 points drill up to 4.5mm steel, we manufacture specialized #5 Drill Point screws capable of penetrating up to 12.5mm of hot-rolled structural steel in a single pass.