Hex Head Self-Drilling Screw
A hex head self-drilling screw is a high-efficiency fastener that combines drilling, tapping, and fastening functions. Its tail features a drill bit design that can directly penetrate color steel plates, thin steel plates, aluminum plates, and steel structures, typically without the need for pre-drilling.
Product Name
Chinese Name: 六角钻尾螺丝
English Name: Hex Head Self-Drilling Screw
Other Names: Hex Washer Head Self-Drilling Screw, Hex Head TEK Screw
Product Introduction
A hex head self-drilling screw is a high-efficiency fastener that integrates drilling, tapping, and fastening functions. Its tail features a drill bit design that can directly penetrate color steel plates, thin steel plates, aluminum plates, and steel structures, typically without the need for pre-drilling.
The product features an external hex head structure that can be quickly installed with an electric socket, providing stable force and high installation efficiency. Some models come with metal washers and EPDM rubber sealing washers to enhance sealing and waterproof performance, making them particularly suitable for roofs, walls, and color steel tile fixation.
Product Features
- Drilling, tapping, and locking in one step
- No pre-drilling required, saving construction time
- External hex head design for easy installation with power tools
- Sharp and clear threads for stable locking performance
- Made of high-strength carbon steel with strong drilling capability
- Can be equipped with EPDM waterproof washers for sealing and leak prevention
- Multiple surface treatment options available with good rust resistance
- Custom sizes, colors, packaging, and surface treatments supported
Technical Parameters
| Item | Parameter |
|---|---|
| Product Name | Hex Head Self-Drilling Screw |
| English Name | Hex Head Self-Drilling Screw |
| Head Type | Hex head, hex washer head |
| Material | C1022A carbon steel, stainless steel 304, stainless steel 316 |
| Size Range | ST4.2, ST4.8, ST5.5, ST6.3 |
| Common Lengths | 13–300 mm |
| Drill Point Type | #2, #3, #4, #5 |
| Surface Treatment | White zinc, yellow zinc, black oxide, phosphate, Dacromet, Geomet, Ruspert |
| Washer | Metal washer, EPDM waterproof washer |
| Drive Type | External hex socket |
| Standards | DIN, ISO, ANSI, JIS or manufactured per drawings |
| Packaging | Small box, carton, woven bag, pallet, or custom packaging |
| Custom Services | OEM, ODM, and non-standard customization supported |
Common Specifications
Common diameters for hex head self-drilling screws include:
- ST4.2
- ST4.8
- ST5.5
- ST6.3
Common lengths include:
- 13 mm
- 16 mm
- 19 mm
- 25 mm
- 32 mm
- 38 mm
- 50 mm
- 65 mm
- 75 mm
- 100 mm
- 125 mm
- 150 mm
Specific sizes can be selected based on the customer's steel plate thickness, installation material, and application scenario.
Material Description
C1022A Carbon Steel
C1022A is a common material for hex head self-drilling screws. After carburizing and heat treatment, the product surface has high hardness, and the drill point has good drilling capability, while the core maintains a certain toughness to prevent brittle fracture.
Stainless Steel 304 and 316
Stainless steel hex head self-drilling screws have good corrosion resistance and are suitable for humid, outdoor, coastal, and chemical environments. For thicker or higher-strength steel plates, bi-metal self-drilling screws can be selected.
Surface Treatment
Various surface treatments are available based on the application environment:
- White Zinc: Bright appearance, suitable for general indoor environments
- Yellow Zinc: Certain corrosion resistance, golden appearance
- Ruspert Coating: Good corrosion resistance, suitable for roofing and outdoor projects
- Dacromet: High temperature and corrosion resistance, suitable for engineering projects
- Geomet: Uniform coating with excellent corrosion resistance
- Mechanical Galvanizing: Reduces the risk of hydrogen embrittlement
- Custom Colors: Available in gray, blue, black, red, and other coatings
EPDM Waterproof Washer
Hex head self-drilling screws can be used with EPDM rubber washers. After installation, the rubber washer is compressed to fit tightly against the plate surface, reducing the entry of rainwater, dust, and moisture into the connection point.
Key advantages:
- Waterproof sealing
- Shock absorption
- Reduces damage to metal surfaces
- Enhances durability of outdoor connections
- Suitable for color steel tile and metal roof installation
During installation, avoid over-tightening to prevent deformation or loss of sealing effectiveness of the EPDM washer.
Drill Point Type Selection
Different drill point types are suitable for different thicknesses of metal materials:
| Drill Point Type | Main Application |
|---|---|
| #2 Drill Point | Thin steel plates, color steel plates, and light metal connections |
| #3 Drill Point | Medium-thickness steel plates and general steel structure connections |
| #4 Drill Point | Thicker steel plates, steel purlins, and heavy-duty connections |
| #5 Drill Point | Thick steel plates and high-strength steel structure connections |
The actual drilling range is affected by screw diameter, material hardness, drill point length, and installation tool speed. It is recommended to confirm based on sample testing results.
Application Areas
Hex head self-drilling screws are widely used in:
- Color steel tile fixation
- Metal roofing projects
- Steel structure buildings
- Sandwich panel installation
- Metal wall panel fixation
- Steel purlin connections
- Containers and mobile homes
- Ventilation duct systems
- Door and window projects
- Photovoltaic mounting systems
- Warehouse and factory construction
- Assembly of mechanical equipment and metal components
Product Advantages
High Installation Efficiency
No pre-drilling is required; drilling and fastening can be completed with power tools, reducing labor costs and shortening construction time.
Stable Drilling Performance
The drill point is heat-treated for high hardness, allowing quick penetration into metal plates and reducing slipping and breakage.
Secure Locking
Thread dimensions are stable, providing reliable connections after insertion, suitable for long-term fixation in construction and industrial scenarios.
Good Waterproof Performance
Products with EPDM washers effectively improve sealing at connection points, suitable for roofing and outdoor projects.
Multiple Customization Options
Head size, drill point type, thread, length, surface color, washer, and packaging can be customized according to customer requirements.
Quality Inspection
The following inspections can be performed during production:
- Raw material material inspection
- Dimension and thread inspection
- Surface hardness inspection
- Core hardness inspection
- Drilling speed test
- Drilling thickness test
- Destructive torque test
- Drive torque test
- Coating thickness inspection
- Salt spray test
- EPDM washer sealing performance check
- Packaging and appearance inspection
Packaging
Common packaging methods include:
- 100 pieces/small box
- 200 pieces/small box
- 250 pieces/small box
- 500 pieces/small box
- 1000 pieces/small box
- Small boxes into outer cartons
- Plastic bags into cartons
- Bulk in woven bags
- Cartons on pallets
- Customer-branded color box packaging
- Neutral or OEM packaging
Packaging quantities can be adjusted based on screw size, unit weight, and customer market requirements.
