Premium ST2.2-ST9.5 Self-tapping Screws: Versatile Fastening for Every Industry
Our ST2.2-ST9.5 Self-tapping Screws, also referred to as Sheet Metal Screws, are engineered to provide high-strength fastening by tapping their own threads into materials like sheet metal, plastic, and wood. Unlike standard machine screws, these self-tapping fasteners feature sharp, hardened threads that create a tight, vibration-resistant bond. Whether you are in the automotive, electronics, or construction sector, our DIN 7981 and DIN 7982 series offer the reliability and precision your projects demand.
As a professional self-tapping screw factory, we use high-grade materials such as 304/316 Stainless Steel for maximum corrosion resistance and C1022 Case-Hardened Carbon Steel for superior drilling performance in tougher substrates.
- Efficient Assembly: Eliminates the need for separate tapping operations, significantly reducing production time and costs.
- Superior Thread Engagement: The deep thread design provides excellent pull-out resistance, making them ideal for thin-walled applications.
- Extensive Variety: Available in Pan Head (DIN 7981) for surface mounting and Countersunk (DIN 7982) for flush finishes.
- Advanced Drive Options: Choose from Phillips, Torx, or Pozi drives to ensure maximum torque transfer and minimize cam-out.
Refer to the chart below for standard metric self-tapping screw dimensions to ensure a perfect fit for your pre-drilled holes.
| Thread Size | Thread Dia (mm) | Pitch (mm) | Suggested Hole (mm) |
|---|---|---|---|
| ST2.9 | 2.90 mm | 1.1 mm | 2.2 – 2.4 mm |
| ST3.5 | 3.53 mm | 1.3 mm | 2.7 – 2.9 mm |
| ST4.2 | 4.22 mm | 1.4 mm | 3.2 – 3.4 mm |
| ST4.8 | 4.80 mm | 1.6 mm | 3.7 – 3.9 mm |
| ST6.3 | 6.30 mm | 1.8 mm | 4.8 – 5.0 mm |
Our ST-Series Self-tapping Screws are essential components in various high-demand fields:
- Electronics: Securing internal components and plastic housings in consumer devices.
- HVAC Systems: Fastening ductwork and air conditioning units where vibration is common.
- Automotive Interior: Mounting trim panels, dashboards, and lighting fixtures.
- Solar Energy: SS316 Self-tapping screws are used for mounting brackets in outdoor solar arrays for long-term weather resistance.
Q: What is the difference between Self-tapping and Self-drilling screws?
A: Self-tapping screws require a pre-drilled hole but create their own threads. Self-drilling screws have a drill-shaped point and can drill their own hole in one operation.
Q: Can I use ST4.2 screws in stainless steel sheets?
A: For stainless steel sheets, we recommend using hardened 410 Stainless Steel or carbon steel screws, as standard 304/316 may be too soft to tap into harder metal surfaces.
Direct Factory Source for ST2.2-ST9.5 Self-tapping Screws
Seeking bulk self-tapping screws with consistent quality and competitive factory pricing? We support OEM customization and global wholesale. Contact us today for a free quote and technical samples!
