Answer :
Final answer:
The three-jaw, plain bearing, key type drill chuck is also known as a Jacobs chuck. It's named after its inventor, Albert Jacobs, and provides a strong, consistent grip on the tool being held.
Explanation:
The term you're looking to fill in the blank with is Jacobs chuck. The three-jaw, plain bearing, key type drill chuck is commonly known as Jacobs chuck. This type of chuck, named after its inventor Albert Jacobs, has a mechanism that uses three jaws in unison to hold onto the bearing of a drill bit. Principally used in drills and lathes, the Jacobs chuck has a cylindrical nature, with teeth that move simultaneously, ensuring a strong, consistent grip on the tool being held.
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