Lug Chucks

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.

Available in sizes:

  • 3” diameter standard, custom sizes available
  • Length: 5” and 12”
  • Maximum bore: 1-1/2” diameter

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  • “Free-floating” lugs
  • Bi-directional grip
  • Split clamp
  • Simple design
  • Heavy-duty seamless design
  • No springs to break and puncture the bladder or jam the lugs inside the shaft body
  • Grips core with rotation in either direction
  • Easy to use
  • Easy to repair
  • Long service life


  • Narrow web unwinds
  • Narrow web rewinds


  • 4” to 10” diameter with customer-specified bore diameter and length
  • Flanged end
  • Core stops