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High Strength (HS) retention knob, BT30, M12X1.75; 15°; Coolant through; Made from 9310H steel, 40% stronger; replaces JM32621

Retention Knob Information and Installation (PDF)

Retention Knob Installation Video

Category: Retention Knobs
Thread Size: M12X1.75
Angle: 15
Knob Diameter: 0.471
L1 Length: 0.7225
L2 Length: 0.919
Flange Thickness: 0.197
Hole Diameter: 0.157
Neck Diameter: 0.313
Pilot Diameter: 0.492
Shoulder Diameter: 0.646
Wrench Flat Diameter: 0.505
Socket Part #: N/A
Number: JM32621HS
Alternate Part: JM32621HTHS
Country of Origin: USA

This knob is a replacement for the following parts:

ManufacturerPart Number
For Machines (see disclaimer)*: Kitamura, Matsuura

* 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