Home   ›   Shop   ›   JM51033

Standard retention knob, BT45, M20X2.5; 15°, Coolant through

Retention Knob Information and Installation (PDF)

Retention Knob Installation Video

Category: Retention Knobs
Thread Size: M20X2.5
Angle: 15
Knob Diameter: 0.904
L1 Length: 0.9055
L2 Length: 1.181
Flange Thickness: 0.197
Hole Diameter: 0.375
Neck Diameter: 0.667
Pilot Diameter: 0.827
Shoulder Diameter: 1.177
Wrench Flat Diameter: 0.943
Socket Part #: RKW45M
Number: JM51033
Solid Version: JM51037
Country of Origin: USA

This knob is a replacement for the following parts:

ManufacturerPart Number
For Machines (see disclaimer)*: 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