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Standard retention knob; CAT40, 5/8-11; 15°, Solid; .375 Hex

Retention Knob Information and Installation (PDF)

Retention Knob Installation Video

Category: Retention Knobs
Thread Size: .625-11
Angle: 15
Knob Diameter: 0.983
L1 Length: 0.5300
L2 Length: 0.960
Flange Thickness: 0.250
Hole Diameter: .375HEX
Neck Diameter: 0.830
Pilot Diameter: -
Shoulder Diameter: N/A
Wrench Flat Diameter: .380HEX
Socket Part #: N/A
Number: JM12122
Country of Origin: USA

This knob is a replacement for the following parts:

ManufacturerPart Number
For Machines (see disclaimer)*: Deckel/Maho

* 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