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High Torque© High Strength (HTHS) retention knob; CAT40, 5/8"-11; 45°, Coolant through; replaces JM11123HT

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: 0.120
Hole Diameter: -
Neck Diameter: 0.490
Pilot Diameter: 0.637
Shoulder Diameter: 0.944
Wrench Flat Diameter: 0.745
Socket Part #: RKW40
Number: JM11123HTHS
Coolant Version: JM11122HTHS
Country of Origin: USA

This knob is a replacement for the following parts:

ManufacturerPart Number
Retention Knob Supply: RK111-23
Seco: 1636
Techniks: 21003
Command: RC4E-0002
Davies: PS-475
Kennametal: RK111-23
Lyndex: C40-STD
MSC: 67985952
Parlec: 40NTRK
For Machines (see disclaimer)*: Fadal, Hurco, Hyundai, Mazak, Okk, Okuma

* 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