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Category: Retention Knobs
Thread Size: M24X3.0
Angle: 45
Knob Diameter: 0.903
L1 Length: 1.3760
L2 Length: 1.770
Flange Thickness: 0.392
Hole Diameter: -
Neck Diameter: 0.668
Pilot Diameter: 0.984
Shoulder Diameter: 1.492
Wrench Flat Diameter: 1.175
Socket Part #: RKW50M
Number: JM31117
Coolant Version: JM31643HT
Alternate Part: JM31117HT
Country of Origin: USA

This knob is a replacement for the following parts:

ManufacturerPart Number
Retention Knob Supply: RK311-17
Sandvik: 393.2930-50 040
Seco: 1670
Techniks: 17805
Kenn 2: 2878505
Command: RB6M-0001
Davies: PS-446X45
Kennametal: RK50BT1M
Lyndex: B50-4500
MSC: 84930023
Parlec: 5003TRK
For Machines (see disclaimer)*: Doosan, Haas, Kitamura, 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