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Standard retention knob, BT50, M24X3, 15°; Coolant through

Retention Knob Information and Installation (PDF)

Retention Knob Installation Video

Category: Retention Knobs
Thread Size: M24X3.0
Angle: 15
Knob Diameter: 1.101
L1 Length: 0.9840
L2 Length: 1.339
Flange Thickness: 0.196
Hole Diameter: 0.453
Neck Diameter: 0.825
Pilot Diameter: 0.983
Shoulder Diameter: 1.413
Wrench Flat Diameter: 1.179
Socket Part #: RKW50M
Number: JM71144
Alternate Part: JM71144HT
Country of Origin: USA

This knob is a replacement for the following parts:

ManufacturerPart Number
Retention Knob Supply: RK711-44
Sandvik: 393.2920-50 042
Seco: 1675
Techniks: 13005
Kenn 2: 2878522
Command: RS6M-0114-C
Davies: PSC-280X15
Kennametal: RK50DVM
Lyndex: B50-1500*
MSC: 1401868
Parlec: DIN50ATRK
For Machines (see disclaimer)*: Feeler, Heller, Kitamura, Lagun, 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