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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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