Self Drilling Bolts
Self Drilling Bolts are integrated self-drilling fasteners designed for direct fastening on steel sheets, purlins and metal profiles without pre-drilling holes. Manufactured in accordance with DIN7504 standard, the drill tip combines drilling, tapping and fastening into one single operation, greatly improving construction efficiency. We produce matching nuts in‑house and can provide complete fastening kits for one-stop procurement.
Handan Hengmai Fasteners Manufacturing Co., Ltd. is one of the most reliable manufacturers and suppliers of self drilling bolts in China. As we have world-leading production equipment and strong manufacturing capabilities, we warmly welcome you to buy bulk high quality self drilling bolts for sale here from our factory. Customized orders are welcome.
Product Overview
Self Drilling Bolts are integrated self-drilling fasteners designed for direct fastening on steel sheets, purlins and metal profiles without pre-drilling holes. Manufactured in accordance with DIN7504 standard, the drill tip combines drilling, tapping and fastening into one single operation, greatly improving construction efficiency. We produce matching nuts in‑house and can provide complete fastening kits for one-stop procurement. Multiple drill point types and surface treatments are available to suit different metal thickness. Our products are widely supplied to roofing, cladding, solar mounting and metal fabrication projects across Belt-and-Road markets.
Product Specification
|
Parameter Item |
Standard Index |
|
Material |
Carbon steel, stainless steel 410 / 304 |
|
Strength Grade |
Class 4.8, Class 8.8 |
|
Thread Precision |
6g metric thread |
|
Surface Treatment |
Electro-galvanized, zinc-aluminum coating, stainless steel natural finish |
|
Size Range |
ST4.2 – ST6.3 |
|
Executive Standard |
DIN7504 |
|
Drill Point Type |
#1, #2, #3, #4, #5 point for different metal thickness |
Product Properties
1. Integrated drill tip enables automatic drilling, tapping and fastening, eliminating pre-drilling process and saving labor cost;
2. Sharp drill bit penetrates metal plate smoothly, not easy to slip during installation;
3. Complete thread ensures reliable locking and good anti-loosening performance under slight vibration;
4. Multiple surface treatments effectively resist rust for outdoor building applications.
Application
Mainly used for color steel tile roofing, wall cladding, solar bracket installation, metal purlin connection, ventilation duct assembly, light steel structure and metal cabinet fabrication. Select longer drill points for thicker steel plates.
Quality Control & Testing
Each batch undergoes drilling penetration test, thread inspection and dimensional measurement. Electroplated products pass salt spray anti-corrosion test. Raw material certificates are archived, and SGS test reports can be provided for bulk orders. All production follows ISO9001 quality control standards.
Packing, Storage, Handling And Transportation
Standard packing: inner moisture-proof PE bags + outer woven bags, palletized for sea shipment. Small orders support cartons with custom shipping marks. Store in dry and ventilated warehouses to avoid moisture rust. We provide FOB, CIF, DDP multi-mode logistics solutions.
After‑Sales & Service
Pre-sales engineers recommend suitable drill point and surface treatment according to your application scenario. If factory-caused defective products appear after arrival, we support free replacement and bear corresponding logistics costs. We can provide installation suggestions for construction teams.
FAQ
Q1: How to choose the correct drill point?
A: Lower number points suit thin metal sheets; higher No.3 / No.4 / No.5 drill points are for thicker steel plates. Please inform us the thickness of your workpiece.
Q2: Can you supply matching nuts together?
A: Yes, our self-produced hex nuts can be delivered together with self drilling bolts in one shipment.
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