IS 1367:2002 Part 5 is the Indian Standard (BIS) for technical supply conditions for threaded steel fasteners - part 5: mechanical properties of fasteners made of carbon steel and alloy steel - nuts with specified proof load values. IS 1367 Part 5 specifies the mechanical properties and testing methods for nuts made of carbon steel and alloy steel. It defines property classes and specified proof load values for nuts with nominal thread diameters up to M39, ensuring mechanical compatibility with standard bolts.
Specifies the mechanical properties of nuts with specified proof load values, made of carbon steel and alloy steel.
| Parameter | IS Value | International | Source |
|---|---|---|---|
| Ultimate Tensile Strength (UTS), Class 8.8 (d > 16mm) | 830 MPa (min) | 830 MPa (min) | ISO 898-1:2013 |
| Yield Strength (ReL or Rp0.2), Class 8.8 | 640 MPa (min) | 640 MPa (min) | ISO 898-1:2013 |
| Proof Load Stress (Sp), Class 10.9 | 830 MPa | 830 MPa | ISO 898-1:2013 |
| Hardness (Vickers), Class 10.9 | 320-380 HV | 320-380 HV | ISO 898-1:2013 |
| Percentage Elongation after Fracture (A), Class 8.8 | 12% (min) | 12% (min) | ISO 898-1:2013 |
| Charpy Impact Strength (KV) for Class 10.9 (d > 16mm) | 30 J at -40°C (if specified) | 27 J at -20°C (mandatory unless from low carbon martensitic steel) | ISO 898-1:2013 |
| Hardness (Vickers), Class 12.9 | 385-435 HV | 385-435 HV | ISO 898-1:2013 |