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OBSOLETE-Standard retention knob, BT40, M16x2, 45°; Coolant through; O-Rings included.

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: 0.120
Knob Side O-Ring: ORM0190-00480NBR-70
Neck Diameter: 0.394
Pilot Diameter: 0.669
Shoulder Diameter: 0.902
Wrench Flat Diameter: 0.074
Socket Part #: RKW40
Number: JM31150
Thread Side O-Ring: ORM0150-01400-N70
Country of Origin: USA

This knob is a replacement for the following parts:

ManufacturerPart Number
Big Kaiser: P40T-1H4
For Machines (see disclaimer)*: Tongtai

* 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