The Jacobs® ball bearing Super Chuck™ is designed especially for extra heavy-duty drilling applications on production drilling machines, radials, jig borers, millers and lathes. It is also the world's most accurate key-type chuck, which further qualifies it for those jobs where close tolerance drilling is desirable.

The ball-thrust bearing reduces friction in the chuck's closing mechanism, permitting the operator to apply greater tightening on the twist drill shank.

Features:

• Sleeve teeth, nosepiece and keyholes are through hardened, providing outstanding wear resistance.
• One-piece sleeve design eliminates cracks between driving teeth.
• Center ground jaws provide absolute straightness and alignment.
• Ball bearing construction maximizes gripping force and drilling accuracy.