The mandrel is the key part of hot rolling tension reel for coils. Coiling temperature is between 550 to 850 degrees celsius. The mandrel has mainly two types:

1. Link wedge type:
   Link wedge type can also be divided into two kinds: link wedge-coupling drive and link wedge-spine drive.
2. Double wedge type:
   For double wedge type tension reel, the mandrel is mainly composed of mandrel body, spreader bar, segment, spreader wedge, buffer wedge and hyd. cylinder.