The chain can be used together with the sprocket for transmission of motion and power. Compared with synchronous belt, the chain can transmit more force and drive large load.  
 
Features:
It is made of integrated steel, capable of bearing large strength.
Through M5x5 of jackbolt, it can firmly combine with 8mm of D-shaped shaft. 
By surface blackening, it can prevent rusting and increasing rigidity.
 
Specifications:
Type: Shaft
Material: Steel 
Inner diameter: 8 mm