CAT40 1/8 x 2.25" End Mill Tool Holder

SKU 202-7433

CAT40 1/8 x 2.25" End Mill Tool Holder

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SKU 202-7433
Mfg SKU # 202-7433
Tool Holder Category End Mill Holder
Brand Tegara
shank size CAT40
Bore Diameter 1/8
projection length 2.25
end mill holder style standard
max rpm balanced to G2.5 20000
TIR (inch) 0.0001
drawbar thread size 5/8x11UNC
Stop Screw Thread Size 1/4-28 UNF
Nose Diameter 0.72
Dual Contact Tool Holder No
Coolant Through Yes
Full Details


  • shars cat40 tool holder

    AT3 or Better

    Taper ground to AT3 or better ensures 80% or more contact with spindle to reduce harmonics and improve runout tolerance

  • shars cat40 tool holder

    Pilot Contact

    Inside bore are precision turned to engage a better contact with retention knob's pilot to increase rigidity

  • shars cat40 tool holder

    Taper End Face

    Precision turning surface finish provide perpendicular contact with the flange of retention knob to increase rigidity

Tech Specification

  • Taper Size


  • Bore Diameter


  • Projection Length


  • Bore Tolerance


  • TIR (at nose face)

    < 0.0001"

  • Max Balanced To

    G2.5 20,000 RPM

  • Coolant Type

    Thru Spindle

  • Rear Thread Size


  • Nose Diameter


Product Spotlight

  • Dynamic Balancing

    Tool holder is balanced to G2.5 20,000 RPM on a HAIMER Tool Dynamic Balancing System from Germany.  Balanced tool holder minimizes the centrifugal forces which minimize the stress on spindle bearing, minimize vibration and maximize the cutting tool's life cycle and greatly improve surface finish. 

  • Pre-Balance Design

    Unique design feature in the extension nose to minimize the off-balance nature of CAT 40 taper specification.  A wall is machined around the center hole to compensate the weight of the metal chips lost from forming this spherical hole.  And when the holder is placed into the Haimer balance machine, less holes would need to be drilled in the v groove of the flange to protect the rigidity of the tool holder. Evenly weight distribution will minimize centrifugal force in high speed spinning and thus maximize the holder's ability to hold the cutting tool concentric to spindle rotation.

  • Mirror Finish

    To achieve AT3 or better taper contact as an industry standard, our taper surface are precision ground on Shigiya CNC grinder from Japan. We are not satisfied with just meeting the industry standard, the surface roughness on the taper is maintained to mirror finish.

  • Tool Holder Cutting Demo

    Watch a quick demo on Tegara tool holder in action to go through the aluminum block like butter. The USA-Made end mills with high helix angle are designed for aluminum to increase feed rate and leaves a good surface finished. The workpiece is clamped in the Tegara 690X vise and machined in a Haas VF7 mill 40 taper.


  • Each holder comes with a lab certificate on its balancing data
  • Flange and V-groove are precision ground to ensure reliable tool change
  • Spindle Thru coolant capability

What's Included