Lug-style chucks contain lugs evenly spaced throughout the body. They are ideal for adapting a single shaft to run multiple core sizes.
The EMT lug-style chuck is activated by supplying air through a fill valve on the end or side of the chuck. Air feeds through the journal end and inflates the bladder assembly. The expansion of the bladder forces out individual lugs to grip the core and provide the necessary torque. Releasing the air pressure allows the “free-floating” lugs to retract for core removal.