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CAT40 1/4, 1/2, 3/4, 7/8 End Mill Tool Holder 4pc Set

Online Price Only: $190.00 Regular Price: $259.40
In stock

Shipping UPS Ground



More Information
Mfg SKU #202-7117G-7441-7128G-7130G
Tool Holder CategoryEnd Mill Holder
shank sizeCAT40
Bore Diameter1/4, 1/2, 3/4, 7/8
end mill holder stylestub
max rpm balanced toG2.5 20000
TIR (inch)0.0001
drawbar thread size5/8x11UNC
Dual Contact Tool HolderNo
Coolant ThroughYes



  • 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

    1/4", 1/2", 3/4", 7/8"

  • Projection Length

    2.5" for 1/4", 1.2" for 1/2" , 1.75" for 3/4" & 7/8" Bore

  • Bore Tolerance


  • TIR (at nose face)

    < 0.0001"

  • Max Balanced To

    20,000 RPM G2.5

  • Coolant Type

    Thru Spindle

  • Rear Thread Size


  • Nose Diameter

    0.88", 1.38", 1.70", 1.75"


  • Pre-Balance Design

    Unique design feature in the keyway of the flange to minimize the off-balance nature of CAT 40 taper specification. Drilled hole in the keyway to compensate the weight of the metal chips lost from forming this spherical hole, this design achieves a nearly even weight distribution in its upright position, like the position inside a machine spindle. 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.

  • CAT40 1/2" End Mill Tool Holder in Action

    Cutting Tool: Gorilla Mill 1/2" 3 Flute Silverback Knuckle Dragger Series (SKU# 422-3122)

    Workpiece Material: 6160 Aluminum

    Machine: CNC 3-axis machining center

    RPM: 15000 ‎ ‎ ‎ ‎ ‎ ‎ ‎ ‎ ‎ ‎IPT: 0.005

    SFM: 1963 ‎ ‎ ‎ ‎ ‎ ‎ ‎ ‎ ‎ ‎ ‎ ‎ ‎DOC: 1.0

    IPM: 225

  • Flange and V-groove are precision ground to ensure reliable tool change
  • Spindle Thru coolant capability

What’s Included

  • 1pc CAT40 1/4" x 2.5" L End Mill Holder (p/n 202-7117G)
  • 1pc CAT40 1/2" x 1.2" L End Mill Holder (p/n 202-7441)
  • 1pc CAT40 3/4" x 1.75" L End Mill Holder (p/n 202-7128G)
  • 1pc CAT40 7/8" x 1.75" L End Mill Holder (p/n 202-7130G)