CAT Hydraulic Tool Holders

CAT Hydraulic Tool Holders use an internal hydraulic expansion mechanism to clamp compatible cylindrical-shank cutting tools. The CAT spindle interface provides the machine connection, while hydraulic pressure supports concentric clamping and repeatable tool positioning. These holders suit precision drilling, reaming and finishing operations where runout, tool projection and machining consistency matter. Selection depends on spindle interface, shank diameter, gauge length, operating speed and coolant requirements.

Concentric Clamping
Hydraulic pressure acts around the tool shank to support concentric positioning. Actual runout depends on holder condition, shank accuracy, clamping diameter and the specified measurement method.

Vibration Damping
The hydraulic clamping mechanism helps damp cutting vibration during suitable machining operations, supporting stable tool engagement and consistent finishing conditions.

Repeatable Tool Setup
Direct hydraulic clamping allows compatible tools to be installed without a separate collet-and-nut assembly. Correct shank dimensions and installation procedures remain essential for repeatable results.

Application Flexibility
Different bore diameters and gauge lengths accommodate varying tool sizes, machining depths and fixture clearances. The selected configuration must match the cutting operation and spindle requirements.

CAT40 Interface
For compatible CAT40 spindle connections. Confirm the interface dimensions, retention hardware and gauge length before specifying the holder.

CAT50 Interface
For compatible CAT50 spindle connections. Verify spindle compatibility, retention hardware and tool-changer clearance against the machine requirements.

Clamping Diameter
Reference bore sizes range from 6 to 32 mm. Specify the exact cutting tool shank diameter and tolerance to establish the correct holder configuration.

Gauge Length
Reference lengths range from 64 to 160 mm. The required length depends on workpiece depth, fixture clearance and the permitted tool projection.

Precision Drilling
Suitable for drilling operations where tool positioning and runout influence hole location and dimensional consistency.

Reaming and Bore Finishing
Supports stable tool positioning in finishing operations where bore diameter, roundness and surface finish are important.

Mold and Die Machining
Suitable for precision cavity and feature machining when the holder profile provides the required access and clearance.

Automotive and General Engineering
Applicable to repeated machining operations on compatible CNC equipment, including precision mechanical components and production parts.

Dimensional Changes
Custom gauge lengths, body dimensions and clamping bores can be reviewed against engineering drawings and machining requirements.

Interface Requirements
Specify the CAT interface, retention hardware and required connection dimensions to establish compatibility before production.

Coolant Configuration
Coolant passages and sealing arrangements can be evaluated against the required delivery route and operating pressure.

OEM Specifications
Product identification, packaging and agreed dimensional requirements can be included in approved custom projects following technical review.

Dimensional Inspection
Verify the spindle interface, clamping bore and gauge length against the approved drawing.

Runout Measurement
Record the measurement position, test method and acceptance tolerance to establish a consistent inspection basis.

Dynamic Balance
Specify the required balance grade together with the corresponding rotational speed. Both values must match the approved configuration.

Inspection Documentation
Inspection reports and agreed technical records can be specified as part of the order documentation requirements.

Confirm the Interface
Identify CAT40 or CAT50 and verify the required spindle connection and retention hardware.

Match the Tool Shank
Provide the nominal shank diameter and tolerance. Confirm whether a reduction sleeve is required and approved for the intended setup.

Define Tool Projection
Specify gauge length, cutting depth and fixture clearance to establish the appropriate holder dimensions.

Confirm Operating Conditions
Provide maximum spindle speed, coolant requirements and machining process so that the configuration can be checked against its rated operating conditions.

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