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Shrink Discs

Shrink Discs

  • Easy assembly and disassembly
  • Compensation of an increased fitting clearance
  • Nominal diameter from 12 mm to 1000 mm
  • Different designs and special surface finish possible

NMTG offers High quality products shrink discs (External Clamping Devices) are flange-shaped, friction-locked shaft-hub connections and are a more powerful and reliable alternative to traditional compression fit, wedge, keyway connections. Pressure is applied externally to the hollow shaft or hub, thus creating an absolutely backlash-free, friction-locked connection between the shaft and the hub.

Depending on customer-specific requirements, our shrink discs are available in proven standard and specially developed special variants, in two- and three-part designs as well as in stainless steel. In addition to torque and bending loads, axial and radial loads can also be transmitted.

Two Part Shrink Disc

Two part shrink disc is characterized by an extremely flat single taper and similarly transfers the required torque in a taper interference fit. The screws on the shrink disc can be tightened without using a torque wrench and thus the disc can be mounted quickly and easily.

Three Part Shrink Disc

Three part shrink disc is characterized by steep double taper and similarly transfers the required torque to the taper interference fit. Our shrink discs can be easily and quickly assembled and disassembled.

Our Products

N4051

Three part design, Light torque capacity

NMTG

N4071

Three part design, Standard range Models for High torques

NMTG

N4091

Three part design, Heaviest, Highly Strong Range

NMTG

NS 12

Average torques,
without bending moment

NMTG

NS 22

High torques + bending moment

NMTG

NS 23

Extremely high torques + bending moment

NMTG

NSD 20

Low torques (10.9 Grade Bolts)

NMTG

NSD 21

Average torques (10.9 Grade Bolts)

NMTG

NSD 22

High torques (10.9 Grade Bolts)

NMTG

NSD 23

Very high torques (10.9 Grade Bolts)

NMTG

NSD 28

As series 22 but with 20 - 30 % higher torque capacity (12.9 Grade Bolts)

NMTG

NSD 28D

High torques, Easy, quick assembly without a torque wrench (12.9 Grade Bolts)

NMTG

About Shrink Disc

Shrink Discs are external clamping device for the backlash free fastening of hollow shafts or hubs to shafts. By tightening clamping screws conical surfaces are pulled together generating radial forces; these forces press the hollow shaft on to the shaft. Torques or axial forces can be transmitted frictionally from the hollow shaft to the shaft. The Shrink Disc itself is not involved in the transmission of torques or axial forces. The radial clamping forces which act through the circumference of the hollow shaft also ensure an optimum centring to the shaft.

Two Part Shrink Disc - The stepped taper outer ring is pulled onto the stepped taper inner ring by tightening the clamping screws. A radial clamping force is generated by the taper surfaces, The radial clamping force presses the hollow shaft onto the shaft and creates a frictional bonded connection at the contact surfaces between the shaft and the hollow shaft. Thereby, torque / axial force can be transmitted between the shaft and the hollow shaft. Two Part Shrink Disc NSD models have flatter cone angle. The compensation of the clearance is very limited.so that tight tolerance are required.

Three Part Shrink Disc - The front nut and rear nut are pulled together over the inner ring by tightening the clamping screws. A radial clamping force is generated by the taper surfaces. The radial clamping force presses the hollow shaft onto the shaft and creates a frictional connection at the contact surfaces between the shaft and the hollow shaft. Thereby, torque / axial force can be transmitted between the shaft and the hollow shaft. Three Part Shrink Disc N40XX models have larger cone angle, as a result of slitted inner ring, a larger clearance between shaft & hub diameters can be compensated.

Benefits of Shrink Discs

The main function of a shrink disc is the safe connection of a shaft with a hub by means of friction. For example, between a drive shaft and a transmission hollow shaft. The shrink disc generates a Backlash-free connection by pressing the hub onto the shaft. This connection is mainly used to transmit torque.

Advantages:

  • Backlash-free connection between shaft and hub
  • Smaller cross section
  • Higher transmittable loads with shorter clamping length
  • Safe absorption of changing load directions
  • Axial fixation of shaft and hub and absorption of bending moments
  • Free positioning on the shaft and hub
  • No additional machining of shaft and hub necessary

NSD Series

  • Two Part Shrink Disc Design
  • Centre the hollow shaft or hub to shaft
  • Easy Mounting & Removal

Benefits

  • Resistant against impacts and shocks within the powertrain.
  • Simultaneous transmission of several loads, such as torques and bending moment, axial or transverse forces.
  • Easy fitting and dismantling thanks to a backlash-free joint between the shaft and hub.

N4051, N4071 & N4091 Series

  • Low, Medium & High Torque transmission capacity
  • Three Part Design
  • Self-releasing
  • Easy mounting & removal
  • External locking devices for hollow shaft (Hub) – shaft connection.
  • Also available in a split version

Benefits

Shrink discs are the modern method for creating a mechanical shrink fit. Our shrink discs offer many advantages over keyed ways and splined shafts including smaller and lighter shafts, less cost of ownership and ease of maintenance.

  • Maximum reliability.
  • A slitted inner ring.
  • Easy replacement, mounting and removal.
  • Low susceptibility to contamination

Application of Shrink Disc

  • Bucket wheels excavator
  • Water / Wind Turbines
  • Cushing Equipment
  • Gearboxes
  • Gearbox test benches
  • Conveyor Systems
  • Drive cable winches
  • Gear-motor connections
  • Hydro Power Application
  • Wood Processing
  • Food Industries
  • Paper & Packaging Industries   
  • Steel & rolling mill
  • Agitator Shaft
  • Mixing & Processing Industries