This standard prescribes the general technical supply conditions and acts as an introductory overview for threaded steel fasteners, including bolts, screws, studs, and nuts. It serves as the master guide, directing users to other specific parts of the IS 1367 series for detailed requirements on mechanical properties, tolerances, and testing.
Specifies general technical supply conditions for bolts, screws, studs and nuts.
Quick Reference Values
applicable thread diameterUp to M39
regular nut property classes4, 5, 6, 8, 9, 10, 12
thin nut property classes04, 05
temperature rangeTested at 10 to 35 °C
Key Formulas
F = As × Sp (Proof Load = Nominal stress area × Proof stress)
Practical Notes
Always match the nut property class to or higher than the bolt property class (e.g., use a Class 8 nut for a Class 8.8 bolt) to prevent thread stripping.
In case of a dispute, the proof load test is the decisive acceptance criterion over hardness testing.
This standard applies to standard nuts but excludes those requiring special properties like weldability, extreme temperature resistance, or corrosion resistance.