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Standard retention knob, CAT40, 5/8"-11, 45°, Coolant through, O-Rings included

Retention Knob Information and Installation (PDF)

Retention Knob Installation Video

Category: Retention Knobs
Thread Size: .625-11
Angle: 45
Knob Diameter: 0.588
L1 Length: 0.9880
L2 Length: 1.264
Flange Thickness: 0.124
Hole Diameter: 0.116
Knob Side O-Ring: ORM0190-00480NBR-70
Neck Diameter: 0.392
Pilot Diameter: 0.641
Shoulder Diameter: 0.903
Wrench Flat Diameter: 0.743
Socket Part #: RKW40
Number: JM32130
Solid Version: JM32114HS, JM32114HTHS, JM31114HS(4), JM31114HTHS(4)- (4) Note difference in flange thickness size
Alternate Part: JM32130HT
Thread Side O-Ring: S-15
Country of Origin: USA

This knob is a replacement for the following parts:

ManufacturerPart Number
Retention Knob Supply: RK321-30
Kenn 2: 2878503
Lyndex: C40-HITACHI
For Machines (see disclaimer)*: Hyundai-Kia

* 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