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OBSOLETE-Standard retention knob, CAT40, 5/8-11, 15°; Coolant through-See JM31617HS, JM31617HTHS

Category: Retention Knobs
Thread Size: .625-11
Angle: 15
Knob Diameter: 0.746
L1 Length: 0.7920
L2 Length: 1.028
Flange Thickness: 0.276
Hole Diameter: 0.236
Neck Diameter: 0.549
Pilot Diameter: 0.641
Shoulder Diameter: 0.902
Wrench Flat Diameter: 0.746
Socket Part #: RKW40
Number: JM31617
Solid Version: JM31616HS, JM31616HTHS
Alternate Part: JM31617HS, JM31617HTHS
Thread Side O-Ring: S-15
Country of Origin: USA

This knob is a replacement for the following parts:

ManufacturerPart Number
Retention Knob Supply: RK316-17
Seco: 1651
Techniks: 21007-15C
Kenn 2: 2878506
HPI: HPS-806-U
Command: RS4E-0212-C
Davies: PSC-532X15
Lyndex: C40-1500H
Parlec: 4008TRKC
For Machines (see disclaimer)*: Doosan, Kitamura, Leblond Makino, 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