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Retention Knobs for CNC Routers

  • All mating surfaces precision ground

  • Manufactured from aircraft quality AMS-6274 alloy steel

  • Hardened for maximum longevity

Product Description

Retention Knobs for CNC Routers 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.

BT30 – 45˚

Part No. 07801

Includes: Heian, Shinx

BT30 – 60˚

Part No. 07806

Includes: Shoda, Anderson (1997 and earlier, verify on manufacturer’s print)

BT30 KOMO

Part No. 750-19

Only for BT30 KOMO routers

BT30 – 90˚

Part No. 07812

(verify on manufacturer’s print)

BT35 – 60˚

Part No. 4403502

(Heian, verify on manufacturer’s print)

DAT 40

Part No. 49003

(verify on manufacturer’s print)

Colombo ISO30 Ball Style for RS Spindles

Part No. 49001-45

Includes: Motion Master (verify on manufacturer’s print)

Colombo ISO30 for Billet Spindle

Part No. 49001

Includes: Motion Master, Anderson (for newer machines, verify on manufacturer’s print)

ISO30 For HSD Spindles

Part No. 49019

Includes: Biesse, Bermag, Bussellato, 

CNT, DMS, CR Onsrud, Masterwood, Thermwood, and Holz-her

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. Overtightening 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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