The standard specifies the mechanical property (performance) of nuts with specified proof load in the test under the environmental temperature 10~35℃.
It shall be noted by users that "the products, which meet requirements of the standard under the environmental temperature, may have different mechanical/physical properties under higher or lower temperature".
Nuts that the standard is applicable to:
Nominal diameter of screw thread D<39 mm;
General purpose screw threads complying with GB/T 192;
Coarse thread diameter and pitch combination complying with GB/T 193;
Basic size complying with GB/T 196;
Tolerance and coordination complying with GB/T 197;
Products with special mechanical requirements;
Opposite side width complying with or equivalent to the requirements of GB/T 3104,
Nominal height ≥ 0.5D;
Products made of carbon steel or alloy steel.
The standard is not applicable to nuts required with special performance, such as:
Locking performance (GB/T 3098.9);
Solderability;
Corrosion resistance (GB/T 3098.15);
Performance requirements under the working temperature higher than +300℃ or lower than -50℃.
Notes:
1. Nuts made of free cutting steel shall not be used under the temperature higher than +250℃.
2. As for special products like nuts used for high strength bolt and hot-dip galvanizing bolt, the relative values is detailed in the product standard.
3. If the thread tolerance of matching parts is larger than 6H/6g, the release hazard will be increased.
4. It the tolerance is larger than 6H, the release strength shall be considered to be reduced, See Table 1.
Contents
Foreword
ISO Foreword
1. Scope
2. Normative References
3. Symbolizing System
4. Material
5. Mechanical Property
6. Proof Load
7. Failure Load of Nut (0.5D≤ Nominal Height< 0.8D)
8. Test Method
9. Marking (Symbolizing)
Appendix A
