1. Depending on the application scenario, select parallel pins with internal thread made of different materials and hardness levels;
2. The parallel pin with internal thread bears shear force as a whole. Hardening allows it to withstand greater shear force, but may risk damaging the mating part;
3. When selecting a parallel pin with internal thread with m6 tolerance, liquid nitrogen cooling may be used during assembly;
4. Hardened parallel pins with internal thread generally adopt m6 tolerance, with a maximum surface roughness of 0.8;
5. Non-hardened parallel pins with internal thread can choose h6, h8, or m6 tolerance, and surface roughness options are Ra0.8, 1.6, or 3.2;
6. Parallel pins with internal thread are mostly used for blind hole structures, so an air release groove must be provided on the surface.

Diameter d: φ6-φ100
Nominal Length L: 10-300mm