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OBSOLETE-Standard retention knob; CAT40, 5/8"-11; 45°, Coolant through-See JM11122HS

Category: Retention Knobs
Thread Size: .625-11
Angle: 45
Knob Diameter: 0.740
L1 Length: 0.4400
L2 Length: 0.640
Flange Thickness: 0.120
Hole Diameter: 0.281
Neck Diameter: 0.490
Pilot Diameter: 0.636
Shoulder Diameter: 0.900
Wrench Flat Diameter: 0.745
Socket Part #: RKW40
Number: JM11122
Solid Version: JM11123HS, JM11123HTHS, JM31226-HHT(3), JM31226-HHTHS(3) (3) Note difference in hole size
Alternate Part: JM11122HS, JM11122HT, JM11122HTHS, JM31226HS(3), JM31226HT(3), JM31226HTHS(3) - (3) Note difference in hole size
Country of Origin: USA

This knob is a replacement for the following parts:

ManufacturerPart Number
Retention Knob Supply: RK111-22
Sandvik: 390.45-5/8 UNC-01
Seco: 1635
Techniks: 21003-C
Big Kaiser: PYN40C
Command: RC4E-0001
Davies: PSC-475
Kennametal: RK40CV
Older Kennametal: 1026590
Lyndex: C40-STD*
MSC: 84935618
New MSC: 68952092
Parlec: 40TRK
For Machines (see disclaimer)*: Fadal, Hurco, Milltronics, Wele/Toyoda

* 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