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Hydro-mechanical Clamping Nut

Clamping Nut



  • Replaces the standard mechanical nut
  • Only 22 ft-lbs of torque produces over 10 tons of clamping force compared to the 280 ft-lbs of torque required by a standard mechanical nut. 
  • Ergonomics and repeatable clamping force ​

  • Temperature resistance up to 248 °F
  • Safe clamping with visual clamping force display (optional)
  • High clamping force with low input torque
  • Easy to retrofit
  • The clamping nut has a through-hole so it can be adapted to different die clamp heights
  • No need for adaptation of the T-blot length
  • Easy clamping and unclamping by hand
  • Maintenance-free
  • High clamping force in a small space



Clamping Nut Hydro-mechanical

Whirlpool saves 6,600 hours annually

In search of better ergonomics for workers with differing physical abilities for their rural Tennessee plant, Whirlpool found the optimal solution at Fabtech. 

ROEMHELD Hydro-mechanical clamping nuts fit 90 percent of dies at the facility without requiring modifications. Setters slide T-bolts and clamping nuts onto the press bed, then hand-tighten them against the die. One or two turns of the 6-inch ratchet achieve the desired torque significantly reducing die change times. 

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ROEMHELD Hilma’s hydro-mechanical clamping nut is a hydraulic die-clamping solution that does not require a pump or hose. The manually torqued clamp has an indicator pin that extends to signal the operator when the clamp has reached its full clamping force. This clamping force is easily repeatable every time you clamp a die.

The ergonomic clamping nut provides high clamping force, between 3,300 and 33,000 lb f, with a low-input torque, between 7 and 30 ft  lb, reducing the operator’s time and risk of injury. A threaded through-hole makes it adaptable to various die clamping heights. The clamping nut is available with five clamping forces with inch and metric threads and is suitable for use on press beds, slides, and rolling bolsters. 

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