bolt and nut 
With spring and balls 
Common carbon steel nut 
Can prevent steel tower against loose 
ISO9001:2008 

    The structure and function of bolt and nut

     1. Unique shape. The appearance of the whole product is circular, no point of being forced, thus to avoid being damaged.

     2. The anti-theft structure is all surrounded embedded type. The anti-theft principles design of this product is reasonable and scientific, work on the main body directly, and combines with bolts tightly. So, the nut can’t be directly damaged by the force, then effectively achieves the anti-theft function.

     3. External ring. The product is added a ring on the outside of the noumenon, after the installation is completed, the outer ring can free rotation on the outside of the noumenon. When it is forced, the outer ring can effectively resolve the external force damage on the noumenon,and play a "protective wall" role to the noumenon.

     4. No environmental pollution. The product does not exist derivatives after the installation , it is benefit to protect the construction environment.