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.
GB/T 3098.2-2000 The following standards are cited：
