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Standard retention knob, CAT50, 1"-8, 90°, Coolant through

Retention Knob Information and Installation (PDF)

Retention Knob Installation Video

Category: Retention Knobs
Thread Size: 1.00-8
Angle: 90
Knob Diameter: 0.942
L1 Length: 0.9030
L2 Length: 1.218
Flange Thickness: 0.197
Hole Diameter: 0.315
Neck Diameter: 0.706
Pilot Diameter: -
Shoulder Diameter: 1.415
Wrench Flat Diameter: 1.175
Socket Part #: RKW50M
Number: JM32420B
Alternate Part: JM32420BHT
Country of Origin: USA

This knob is a replacement for the following parts:

ManufacturerPart Number
Retention Knob Supply: RK324-20B
Seco: 43991
Command: RS6E-0101-C
Kennametal: RK324-20b
MSC: 1401967
Parlec: MS5034TRK
For Machines (see disclaimer)*: Mitsui-Seiki

* 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