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OBSOLETE-Standard retention knob, BT40, M16x2, 45°; Coolant through-See JM31113DHS

Category: Retention Knobs
Thread Size: M16X2.0
Angle: 45
Knob Diameter: 0.589
L1 Length: 1.1000
L2 Length: 1.376
Flange Thickness: 0.234
Hole Diameter: 0.197
Neck Diameter: 0.392
Pilot Diameter: 0.669
Shoulder Diameter: 0.903
Wrench Flat Diameter: 0.741
Socket Part #: RKW40
Number: JM31113D
Solid Version: JM31113HS, JM31113HTHS
Alternate Part: JM31113DHS, JM31113DHTHS
Country of Origin: USA

This knob is a replacement for the following parts:

ManufacturerPart Number
Retention Knob Supply: RK311-13D
Seco: 1622
Command: RB4M-0001-C
Davies: PSC-444X45
Lyndex: B40-4500H
MSC: 1401652
Parlec: 4003TRKC
For Machines (see disclaimer)*: Bridgeport, Haas, Toyoda, Viper

* 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