Short description: The Duro-A is a three-jaw chuck with through-hole that can be operated automatically, i.e., hydraulically by a CNC machine. It is primarily used for machining cylindrical and disc-shaped workpieces. Stable clamping force is achieved through axial tension. The workpiece is automatically pulled against the fixed stop by the operation of the clamping spindle. Vibration damping is provided by a high proportion of vulcanized rubber in the clamping sleeves. Prepared for air system control. Compatible with intermediate flanges type 269-90. Technical features: high flatness and roundness accuracy; high repeat accuracy; consistently constant clamping force over 500,000 cycles; wedge hook principle; permanently installed main jaw, top jaws secured by key stones; threaded ring fully prepared. Applications: automatic clamping machining machines; machining of bars, pipes, flanges, and discs. Advantages: high clamping forces (up to 250 kN in the 400 version); high speeds (up to 8,000 RPM in the 165 version); reduced interference contour; large through-hole diameter. Additional information: The Duro-A Ø315 is a three-jaw chuck with a through-hole Ø98.5, cylindrical mount ZA 220, and a pointed tooth profile of 90°, which can be operated automatically, i.e., hydraulically by a CNC machine. It is primarily used for machining cylindrical and disc-shaped workpieces.