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Standard retention knob; CAT40, 5/8"-11; 415°, Solid; No pilot

Retention Knob Information and Installation (PDF)

Retention Knob Installation Video

Category: Retention Knobs
Thread Size: .625-11
Angle: 15
Knob Diameter: 0.500
L1 Length: 0.5930
L2 Length: 0.749
Flange Thickness: 0.130
Hole Diameter: -
Neck Diameter: 0.310
Pilot Diameter: -
Shoulder Diameter: 1.000
Wrench Flat Diameter: 0.43
Socket Part #: N/A
Number: JM11314
Country of Origin: USA

This knob is a replacement for the following parts:

ManufacturerPart Number
Retention Knob Supply: RK113-14
Command: RS4E-0111
For Machines (see disclaimer)*: Boston Digital

* 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