Turning facts – Types of jaws

January 13, 2023

2 JAW CHUCK Ability to machine irregular shaped components. 2-jaw chuck can grip over projections when machining fittings or similar parts

3 JAW CHUCK Most commonly used chucks. Can hold a hexagonal bar stock. Cannot hold a square bar stock. Cannot hold irregularly shaped work.

4 JAW CHUCK Can hold a square bar stock. More grip on round stock. Can be used to hold irregularly shaped parts. Cannot hold a hexagonal bar stock.

HARD JAWS Hard jaws are usually used on rough material surface. Using soft jaws on rough surfaces may create impressions on clamping surface of soft jaws.

Hard jaws usually leave an impression mark on the softer jobs.

SOFT JAWS Soft jaws are made from soft steel, bored to grip a part at particular diameter. Soft jaws usually don't leave an impression on jobs.