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Standard retention knob; CAT50, 1"-8; 45°, Solid, no pilot

Retention Knob Information and Installation (PDF)

Retention Knob Installation Video

Category: Retention Knobs
Thread Size: 1.00-8
Angle: 45
Knob Diameter: 1.140
L1 Length: 1.6600
L2 Length: 1.960
Flange Thickness: 1.160
Hole Diameter: -
Neck Diameter: 0.820
Pilot Diameter: -
Shoulder Diameter: 1.440
Wrench Flat Diameter: 1.245
Socket Part #: RKW50
Number: JM11145A-H
Coolant Version: JM11145A
Country of Origin: USA

This knob is a replacement for the following parts:

ManufacturerPart Number

* 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