Explore New Videos on Instagram #sharstoolco


More Information
Mfg SKU #202-7143G
Tool Holder CategoryEnd Mill Holder
shank sizeBT40
Bore Diameter1/4
projection length1.75
end mill holder stylestub
max rpm balanced toG2.5 20000
TIR (inch)0.0002
drawbar thread sizeM16x2.0
Stop Screw Thread Size1/4-28 UNF
Nose Diameter0.88
Dual Contact Tool HolderNo
Coolant ThroughYes



  • shars bt40 ER 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



  • 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. 

  • 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