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High Strength (HS) retention knob, CAT40; 5/8"-11, 45°, Coolant through; Made from 9310H steel; 40% stronger, replaces JM11122

Retention Knob Information and Installation (PDF)

Retention Knob Installation Video

Category: Retention Knobs
Thread Size: .625-11
Angle: 45
Knob Diameter: 0.740
L1 Length: 0.4400
L2 Length: 0.640
Flange Thickness: 0.118
Hole Diameter: 0.217
Neck Diameter: 0.490
Pilot Diameter: 0.637
Shoulder Diameter: 0.944
Wrench Flat Diameter: 0.745
Socket Part #: RKW40
Number: JM11122HS
Solid Version: JM11123HS, JM11123HTHS, JM31226-HHT(3), JM31226-HHTHS(3) (3) Note difference in hole size
Alternate Part: JM11122HT, JM11122HTHS, JM31226HS(3), JM31226HT(3), JM31226HTHS(3) - (3) Note difference in hole size
Country of Origin: USA

This knob is a replacement for the following parts:

ManufacturerPart Number
For Machines (see disclaimer)*: Fadal, Hurco, Milltronics, Wele/Toyoda

* 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