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Retention Knob 40M-BT / PT-45-1.100


Price: From $30.36 to $37.68
Manufacturer: J & M Machine, Inc.
Manufacturer Part No: JM31113
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Product Options

Knob Style:
US Made. Serial Number, Work Order Number and Part Number are laser marked on knob for easy reordering.  Knobs come packed individually in cardboard tubes for added protection. Satisfaction guaranteed.

This knob is available in two styles, Standard and New Generation "HIGH TORQUE" style. See below for details.

Dia. Pitch = M16 x 2.0
Angle Rad. = 45 degree
Knob Dia. = .589"
Neck Dia. = .392"
Hole Dia. = N/A
Pilot Dia. = .6690"
OAL = 2.36"
L1 Length = 1.1000"
L2 Length = 1.3760"
Hole Yes/No = No
Socket Part Number: RKW40

New Generation High Torque Details:
It has been proven that J&M's new High Torque Retention Knobs, when tightened to the same torque value as standard retention knobs, expand the tool holder shank two to three times less than the standard knob.  The inclusion of a pilot on the high torque ANSI retention knobs greatly reduces the likelihood of retention knob breakage, especially when the Belleville Washers are not performing at full strength.  The High Torque retention knobs are designed to be balanced dynamically from end to end, which make it much easier to keep balanced toolholders within tight balancing tolerances after installation.

Features of the High-Torque Retention Knob:

  • reduces toolholder expansion
  • reduces costs
  • increases profit
  • increases production
  • increases tool life
  • increases feed rates
  • increases rigidity
  • improves toolholder balance

Related Products

Socket for Retention Knob RKW40
Price: $100.15
Socket for Retention Knob RKW40
Retention Knob Sockets. Both Sockets and Material are made in the USA. Sockets have ½” drive. Torque value is laser marked on the outside of socket. Using a Torque wrench and a socket gives the exact tightness the manufacturer requires.
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