Standard External T-Step Nuts - Used for standard screws and T-step nuts.

2. Hexagon T-type step nut for head—Less commonly used in machinery, with similar mechanical properties, typically used in special environments and conditions.

Velvet T-step nuts - Frictionless surface, spark-proof structure, rarely used in mechanical applications.

4. Headless T-Type Step Nut - Required for certain structures, such as those needing high clamping force in threaded structures, or where a concealed cylindrical head is necessary.

5. T-stud with internal hexagonal socket—widely used among all screws due to its higher clamping force, which can be easily operated with a hex wrench, offering convenience during installation. It is suitable for various structures, with a neat and aesthetically pleasing appearance. However, its clamping force is slightly lower than that of the external hex, and repeated use can easily damage the internal hex socket, making it difficult to remove.