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Socket for most JM CAT 40 retention knobs. Using a socket and torque wrench for retention knob installation will extend the life of your retention knob and toolholder. Click on Product Description below for more information.
Our Price: $85.25

JM Part Number Part Max Dia Part Max Flat Max Torque Drive Size
  Inches Inches Ft-lbs Inches
RKW40 0.944  0.755  40 0.500
RKW40M 0.894 0.711 40 0.500

  • Lifetime Guarantee
  • Made in the USA using AISI 4150 steel
  • Extends the life span of the Retention Knob and Toolholder

    WARNING: The steel alloy used in this product contains chromium and nickel.  This product can expose you to chemicals including chromium and nickel, which are known to the State of California to cause cancer and birth defects or other reproductive harm.  For more information go to

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