1. When selecting nuts, the hardness of low carbon steel plate must be less than 70RB and that of stainless steel plate must be less than 80RB, depending on the thickness and size range of the plate used.

2. Free-cutting iron surface treatment, stainless steel to maintain the primary color, users can according to the needs of the model specifications in the table ordered, but also according to the needs of special customization.

3. The hole size of sheet metal must be machined according to the tolerance size of 0-+0.075 mm. Punching is recommended.

4. Installation must be accomplished through "riveting" operation. No impact tapping is allowed.

5. When stainless steel is used as material, the tail number is marked with "S".

6. The end face of nut column is straight tooth, which is expressed by "C".

7. The length of through-hole nut post is less than 10 mm, and it can be enlarged at hexagonal end face (type I) or round end face (type II) above 10 mm.