The CHS Series from Ozkayali is a family of 4-jaw automatic power chucks engineered for CNC lathes and turning centers where high clamping force, durability, and open-center workpiece clearance are required. The entire chuck body is machined from special alloy steel, fully hardened and ground — a construction choice that prioritizes wear resistance and repeatable clamping accuracy over the weight savings of cast-iron alternatives.

What distinguishes the CHS Series from standard power chucks?

The defining feature is the integrated forced-lubrication system. Rather than relying on manual greasing, the CHS body incorporates precision-drilled oil channels that distribute lubricant uniformly across all sliding surfaces — jaw guides, wedge mechanisms, and the draw-tube interface. This reduces friction-induced wear at high RPM and extends the interval between maintenance teardowns. Combined with the open-center (through-hole) configuration, the chuck accommodates bar-fed workpieces while maintaining full clamping force across the entire gripping range.

Which size fits my application?

The CHS Series is available in five outer-diameter sizes: 169 mm (7 in), 210 mm (8 in), 254 mm (10 in), 305 mm (12 in), and 381 mm (15 in). Clamping force scales from approximately 38 kN at the smallest size to 120 kN at the largest. Maximum spindle speed ranges from 2,500 rpm (381 mm) to 6,000 rpm (169 mm). Each size maintains the same open-center through-hole configuration and alloy-steel construction, with per-size dimensional drawings available from Ozkayali on request.

What is included with the chuck?

Each CHS Series chuck ships as a complete kit: the chuck body with mounting bolts, one set of soft top jaws (machinable for custom workpiece profiles), one set of hard top jaws (for general-purpose gripping), T-nuts with retaining bolts, the chuck mounting key, and an unhandled lantern spindle nut. No additional jaw sets or mounting hardware need to be ordered separately for initial setup.