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OBSOLETE-Standard retention knob, BT40, M16x2, 60°; Solid-See JM31113AHS

Category: Retention Knobs
Thread Size: M16X2.0
Angle: 60
Knob Diameter: 0.589
L1 Length: 1.1000
L2 Length: 1.376
Flange Thickness: 0.234
Hole Diameter: -
Neck Diameter: 0.392
Pilot Diameter: 0.669
Shoulder Diameter: 0.903
Wrench Flat Diameter: 0.741
Socket Part #: RKW40
Number: JM31113A
Coolant Version: JM31113EHT, JM31113EHTHS
Alternate Part: JM31113AHS, JM31113AHTHS
Country of Origin: USA

This knob is a replacement for the following parts:

ManufacturerPart Number
Retention Knob Supply: RK311-13A
Sandvik: 393.2935-40 025
Seco: 1620
Techniks: 17808
Kenn 2: 2878456
Big Kaiser: P40T-2
Command: RB4M-0002
Davies: PS-444X60
Kennametal: RK40BT2M
Lyndex: B40-6000
MSC: 84946110
New MSC: 68952282
Parlec: 4004TRK
For Machines (see disclaimer)*: Enshu, Hitachi-Seiki, Matsuura, Milltronics

* 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