DIN931 Hex Bolts | Factory Wholesale, Customizable, In-House Galvanizing
High quality 4.8 8.8 10.9 12.9 DIN933 931 hex bolt
An externally threaded fastener with a hexagonal head, washer-face beneath the head, a metric thread pitch, made from medium carbon steel and heat treated. Threaded shank does not extend completely to the head.
The most commonly used M6–M20 sizes
| Nominal Size d | Pitch P (mm) | Width Across Flats S (mm) | Head Height k (mm) | Thread Length b (mm) (for L ≤ 125 mm) | Shank Diameter ds (mm) | Recommended Clearance Hole Diameter (mm) |
|---|---|---|---|---|---|---|
| M6 | 1.0 | 10 | 4.0 | 18 | 6.0 | 6.6 |
| M8 | 1.25 | 13 | 5.3 | 22 | 8.0 | 9.0 |
| M10 | 1.5 | 16 | 6.4 | 26 | 10.0 | 11.0 |
| M12 | 1.75 | 18 | 7.5 | 30 | 12.0 | 13.5 |
| M14 | 2.0 | 21 | 8.8 | 34 | 14.0 | 15.5 |
| M16 | 2.0 | 24 | 10.0 | 38 | 16.0 | 17.5 |
| M18 | 2.5 | 27 | 11.5 | 42 | 18.0 | 20.0 |
| M20 | 2.5 | 30 | 12.5 | 46 | 20.0 | 22.0 |
Specifications – Application Scenarios Cross-Reference Table
| Specifications | Typical Application Scenarios | Compatible Industries / Equipment | Core Advantages |
| M6 | Small Equipment Enclosures, Electrical Cabinet Accessories, Furniture Hardware, Automotive Interior Components | General Machinery, Home Appliances, Automotive Interiors | Lightweight and easy to install; suitable for non-load-bearing or light-load applications. |
| M8–M10 | Equipment Racks, Motor Bases, Bracket Mounting, Small Flange Connections | Automation Equipment, Sheet Metal Fabrication, General Machinery | Balancing both strength and versatility, this serves as the “universal standard” for mechanical assembly. |
| M12–M16 | Steel structural components, equipment spindle connections, pump and valve flanges, automotive chassis components | Construction machinery, automotive manufacturing, energy equipment | The semi-threaded design prevents thread damage to the hole walls, making it suitable for thick plates and heavy-duty connections. |
| M18–M24 | Bridges / Steel Structure Joints, Heavy Equipment Frames, Wind Turbine Tower Components, Construction Machinery Chassis | Construction Engineering, Wind Power, Heavy Machinery | High tensile strength; suitable for meeting the long-term load-bearing requirements of large-scale structural components. |
| M27+ | Pressure Vessel Flanges, Heavy Engineering Machinery, Marine Equipment, Power Plant Equipment | Petrochemicals, Heavy Marine Industry, Power Sector | High Strength Grades (Primarily Grade 10.9) — Providing Secure Connections for Extreme Operating Conditions |
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