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BT Retention Knobs

  • All mating surfaces precision ground

  • Manufactured from aircraft quality AMS-6274 alloy steel

  • Hardened for maximum longevity

Product Description

CAT Retention Knobs are manufactured from aircraft quality AMS-6274 alloy steel and  are hardened for maximum longevity. Match the dimensions and appearance of your retention knob to the drawings below. Use the manufacturer’s print that came with your machine to verify your selection. For safe operation,  ensure the pull stud you order is the exact pull stud your machine uses. Using the wrong pull stud can cause damage to the spindle and/or toolholder, and can create a safety hazard.

BT Standard
BT Coolant-thru
Part No.DescriptionθDd1d2d3I1l2T
17801BT30 - 45°45°16.511712.52318M12
17803BT40 - 45°45°231510173528M16
17834BT40, ANSI, metric thread45°2318.812.512.41611M16
17805BT50 - 45°45°382317254535M24
17806BT30 - 60°60°16.511712.52318M12
17808BT40 - 60°60°231510173528M16
17810BT50 - 60°60°382317254535M24
17812BT30 - 90°90°16.511712.5238M12
17814BT40 - 90°90°231510173528M16
17816BT50 - 90°90°382317254535M24
Part No.DescriptionθDd1d2d3d4I1I2T
17817BT30 - 45˚ coolant45°16.511712.542318M12
17818BT40 - 45˚ coolant45°2315101743528M16
17820BT40 - 60˚ coolant60°2315101743528M16
17822BT40 - 90˚ coolant90°2315101743528M16
17824BT50 - 45˚ coolant45°3823172554535M24
17826BT50 - 60˚ coolant60°3823172554535M24
17828BT50 - 90˚ coolant90°3823172554535M24

Rentention Knob Best Practices

Regularly inspect retention knobs for signs of wear. Wear may appear as dimples or grooves under the head or visible corrosion anywhere on the retention knob. If the retention knob demonstrates any signs of wear replace it immediately. 

Make sure to properly torque the retention knob to the manufacturer’s specifications. Use a torque wrench and retention knob adapter to ensure proper torque. Over-tightening can overly stress the retention knob leading to premature failure and can cause the tool holder taper to swell leading to a poor fit between the machine spindle and the tool holder.

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