Hobson technical document
Metric Hex Bolt Properties: Stress Area, Proof Load and Tensile Load by Class
Hobson's four-page technical data sheet of metric hex bolt properties. For every size from M3 to M64 it lists the pitch and stress area, and the minimum tensile stress, stress under proof load, proof load and ultimate tensile load for class 4.6, class 8.8, AS 1252 and class 10.9 bolts.
What this covers
- Minimum tensile stress
- Minimum stress under proof load
- Minimum proof load
- Minimum ultimate tensile load
Applies to Bolt Blank and Hex Bolts & Set Screws.
Key things to remember
The essentials from this document in plain words. Check the full document before you rely on a figure.
- Covers sizes M3 to M64, with thread pitch and stress area for each (for example M12 1.75mm pitch, 84.3mm²; M20 2.5mm, 245mm²).
- Minimum tensile stress: class 4.6 400 MPa; class 8.8 800 MPa up to M16 and 830 MPa from M18; class 10.9 1,040 MPa.
- AS 1252 bolts are listed from M12 to M36 only, with the same figures as class 8.8.
- Minimum proof load, M12: class 4.6 19.0kN, class 8.8 48.9kN, class 10.9 70.0kN. M20: 55.1kN, 147.0kN and 203.3kN.
- Minimum ultimate tensile load, M12: class 4.6 33.7kN, class 8.8 67.4kN, class 10.9 87.7kN. M20: 98.0kN, 203.3kN and 254.8kN.
- These are minimum properties for each size and class. The document gives no working loads for a joint.
Who it helps: Engineers, fabricators and staff comparing bolt classes, or checking the proof or tensile load of a size.
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