Retention Knobs and Retention Knob Sockets

knobs   |    sockets

link to high torque retention knob page


Retention Knob Styles
     

 Style A

 Style B

 Style C

   click on image or style type for larger view
     

 Style D

 Style E

 Style F

when requesting or ordering please specify the following:
 Quantity  Style  T  A
 D1  D2  D3  D4
   L  L1  
 special requirements:

 Machine
 make  model  spindle size  

 

 

 

Safety information

 

Warning!!!

Machining Center Manufacturers have increased draw bar force on Retention Knobs from 3 to 5 times in recent years. Old retention knobs may fail if used in New High Performance Machines.

 

 

Retention Knob Safety!

Retention Knobs are not intended to last forever. Your Safety Program must include Retention Knob inspections. Knobs must be visually inspected for damage and checked for tightness every time the tool holder is changed.

 

New! Retention Knobs Have Year & Serial Numbers

Newman Tools has included the last 2 digits of the year manufactured and a Serial Number, which is marked on each Retention Knob for your convenience in tracking. This helps you to record the Retention Knob's Year Manufactured and the serial number, and the type of inspection preformed in your Machine Safety Inspection Log.

Every 2 or 3 Years depending on use, Knobs should be removed from the holder and Magnetic Particle Inspected. Any Retention Knobs, showing indications of cracking must be discarded. If your machine has been in a collision, or releases a tool prematurely, this is an indication that the Retention Knob Fingers, Finger Guide, Belleville Washers, or the Retention Knob may be damaged. The machine tool should not be used, until Inspected by Factory or Maintenance Personnel. In this case all the Retention Knobs in the Machine should be checked for cracks or damage immediately.

 

Retention Knob Sockets

Sockets aid in the installation and removal of Retention Knobs. By using a Socket and a Torque Wrench the ideal tightness is achieved, without rounding off the Retention Knob's corners. Sockets are designed to work when flats are up to .020 under Wrench Size Max.

 

Note: Some Retention Knobs have mixed standards. Check the Shoulder and Wrench Sizes carefully when selecting a Socket to fit your requirements.

Part No.  Size of taper  1/2" drive socket fits retention knob type  Thread Size  Shoulder Dia.Max.  Wrench size Max.
 RKW30 30  ANSI  1/2-13 UNC  0.655"  0.535"
 RKW30M 30  JMTBA  M12  0.675"  0.511"
 RKW30D 30  DIN  M12  0.675"  0.556"
           
 RKW40  40 ANSI
JMTBA
ISO TypeA
DIN
 5/8-11 UNC  0.944"  0.755"
 RKW40M  40 ISO Type B  M16  0.894"  0.711"
           
 RKW45  45  ANSI  3/4-10 UNC  1.205"  1.004"
 RKW45M  45  JMTBA
ISO
DIN
 M20  1.225"  0.950"
           
 RKW50  50  ANSI  1.00-8 UNC  1.450"  1.255"
 RKW50M  50  JMTBA
ISO Type A & B DIN
 M24  1.500"  1.185"
           
           

link to high torque retention knob page

 

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