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Category: Retention Knobs
Thread Size: 1.00-8
Angle: 90
Knob Diameter: 0.903
L1 Length: 1.3840
L2 Length: 1.778
Flange Thickness: 0.392
Hole Diameter: -
Neck Diameter: 0.668
Pilot Diameter: 1.026
Shoulder Diameter: 1.438
Wrench Flat Diameter: 1.245
Socket Part #: RKW50
Number: JM31118B
Coolant Version: JM34218B, JM34218BHT, JM34218BHTHS, JM34218BHPHT, JM34275HTHS, JM32131HT, JM32129HTHS, JM31244A, JM32141
Alternate Part: JM31118BHT, JM31118BHTHS
Country of Origin: USA

This knob is a replacement for the following parts:

ManufacturerPart Number
Retention Knob Supply: RK311-18B
Seco: 1683
Techniks: 21005-90
Kenn 2: 2878485
HPI: HPS-019
Command: RB6E-0003
Davies: PS-536X90
Kennametal: RK311-18B
Lyndex: C50-9000
MSC: 1401900
Parlec: 5001TRK
For Machines (see disclaimer)*: Hitachi-Seiki, Hwacheon, Mori Seiki, Okk, Victor

* 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