Center Drills

• Used to locate the hole position for a larger drill . 

• With short flutes and overall length and no body clearance, these drills have extreme rigidity and may be chucked close to the drill point for precise location . 

• Ideal for the point center hole, in order to ensure the parts of the hole processing position. 

Usually  have HSS M2 ,HSS M35,Tungsten Carbide center drill based on raw material,it has different diameter and different length

The center hole is the positioning base surface on which the shaft workpiece is mounted on the center.  The 60° cone hole of the center hole is matched with the 60° cone surface of the center hole; The small round hole in the inner end, in order to ensure that the cone hole and the top cone fit properly, and can store a small amount of lubricating oil (butter).  

The common center holes are type A and type B.  Type A center hole has only a 60° cone hole.  The 120° cone surface of the outer end of the B type center hole is also called the protection cone surface, which is used to protect the outer edge of the 60° cone hole from being damaged.  

                                 DIN333A                                                                                                                 DIN333B

The another centering drill called Spotting Drill  have both centering and deburing functional.