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High Torque© (HT) retention knob, CAT40; 5/8"-11, 45°, Coolant through; replaces JM17123

Retention Knob Information and Installation (PDF)

Retention Knob Installation Video


Category: Retention Knobs
Thread Size: .625-11
Angle: 45
Knob Diameter: 0.594
L1 Length: 1.1390
L2 Length: 1.438
Flange Thickness: 0.187
Hole Diameter: 0.157
Neck Diameter: 0.406
Pilot Diameter: 0.641
Shoulder Diameter: 0.875
Wrench Flat Diameter: 0.688
Socket Part #: RKW40M
Number: JM17123HT
Solid Version: JM17122HT
Country of Origin: USA

This knob is a replacement for the following parts:

ManufacturerPart Number
New MSC: 68952191
For Machines (see disclaimer)*: Cin/Milacron

* 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