Bolt Property Classes 4.6, 8.8 and 10.9: What the Numbers Mean
The two numbers stamped on a bolt head tell you its tensile and yield strength. Here is how to read them and match nuts correctly.
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Bhilai-based manufacturer of high-strength hex bolts (M12–M64, IS 1363), RDSO fish bolts, track bolts for points & crossings, railway plate screws, foundation bolts and specialised fasteners to drawing. Serving SAIL Bhilai Steel Plant, Indian Railways and industry for 40 years.
The two numbers stamped on a bolt head tell you its tensile and yield strength. Here is how to read them and match nuts correctly.
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