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Standard retention knob, BT30, M12x1.75; 45°, Solid

Retention Knob Information and Installation (PDF)

Retention Knob Installation Video

Category: Retention Knobs
Thread Size: M12X1.75
Angle: 45
Knob Diameter: 0.510
L1 Length: 0.8836
L2 Length: 1.100
Flange Thickness: 0.195
Hole Diameter: -
Neck Diameter: 0.332
Pilot Diameter: 0.511
Shoulder Diameter: 0.785
Wrench Flat Diameter: 0.667
Socket Part #: N/A
Number: JM31111
Country of Origin: USA

This knob is a replacement for the following parts:

ManufacturerPart Number
Retention Knob Supply: RK311-11
For Machines (see disclaimer)*: Yci

* Retention knobs are not interchangeable. Machines are only given as a reference, JMPP makes no guarantee this is the correct knob for your machine. Please call us at 1-800-322-7750 or email for knob identification help.

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