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Category: Retention Knobs
Thread Size: 1.00-8
Angle: 45
Knob Diameter: 0.903
L1 Length: 1.3840
L2 Length: 1.778
Flange Thickness: 0.392
Hole Diameter: -
Neck Diameter: 0.668
Pilot Diameter: 1.026
Shoulder Diameter: 1.438
Wrench Flat Diameter: 1.245
Socket Part #: RKW50
Number: JM31118
Coolant Version: JM31118D, JM31118DHT, JM31118DHTHS
Alternate Part: JM31118HT, JM31118HTHS
Country of Origin: USA

This knob is a replacement for the following parts:

ManufacturerPart Number
Retention Knob Supply: RK311-18
Seco: 1680
Techniks: 21005-45
Kenn 2: 2878454
Command: RB6E-0001
Davies: PS-536X45
Kennametal: RK311-18
Older Kennametal: 1021844
Lyndex: C50-4500
MSC: 1401884
Parlec: 5005TRK
For Machines (see disclaimer)*: Doosan, Haas, Johnford, Makino, Toyoda

* 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