Tech Tip #129 - Using Hydraulic Chucks – Kennametal

  1. Remove all grease from the hydraulic chuck and cutting tools before using.
  2. Insert the cutting tool into the clamping bore as far as the stop pin /stop screw will allow.
  3. Adjust the cutting tool length with a hex wrench.
  4. Always hand-tighten the clamping screw with a hex wrench as far as the stop limit. Never try to adjust the stop pin when the hydraulic chuck is in the clamping position.
  5. For best accuracy, use a round shank (no flats) with h6 tolerance and no bushing.
  6. Weldon shanks can be gripped without reducer collets, ¾” (20 mm) maximum diameter. However, the use of reducer collets for all flatted shanks is recommended.
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