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Shrink Disc RfN 4012 Light Duty Series

Simplified manufacture – only plain shaft and bore diameters with easily achieved surface finish and tolerances are required. Light duty series for torque transmission.
Easy adjustability - Easy mounting - Easy removal - Low susceptibility to contamination - Highest reliability

This product is available in the following configurations: SDA, SDB, SDC and SDD.

RINGFEDER® RfN 4012

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metrisch inch
CAD Typ d D d1 G L2 T nSc screws norm FSc DG TA
    mm mm mm mm mm Nm Stück     mm Nm
  10 9 39 25 12 10 20 3 ISO 4014/4017 10.9 6 12
  10 10 39 25 12 10 20 3 ISO 4014/4017 10.9 6 12
  10 11 39 25 12 10 20 3 ISO 4014/4017 10.9 6 12
  12 11 44 28 14 13 50 3 ISO 4014/4017 10.9 6 12
  12 12 44 28 14 13 50 3 ISO 4014/4017 10.9 6 12
  12 13 44 28 14 13 50 3 ISO 4014/4017 10.9 6 12
  15 14 52 36 18 15 130 3 ISO 4014/4017 10.9 8 30
  15 15 52 36 18 15 130 3 ISO 4014/4017 10.9 8 30
  15 16 52 36 18 15 130 3 ISO 4014/4017 10.9 8 30
  20 16 60 42 22 17 200 3 ISO 4014/4017 10.9 8 30
  20 18 60 42 22 17 200 3 ISO 4014/4017 10.9 8 30
  20 20 60 42 22 17 200 3 ISO 4014/4017 10.9 8 30
  25 20 66 48 27 19 340 5 ISO 4014/4017 10.9 8 30
  25 22 66 48 27 19 340 5 ISO 4014/4017 10.9 8 30
  25 25 66 48 27 19 340 5 ISO 4014/4017 10.9 8 30
  30 25 76 56 32 21 550 6 ISO 4014/4017 10.9 8 30
  30 28 76 56 32 21 550 6 ISO 4014/4017 10.9 8 30
  30 30 76 56 32 21 550 6 ISO 4014/4017 10.9 8 30
  40 30 96 70 43 25 1060 6 ISO 4014/4017 10.9 10 60
  40 35 96 70 43 25 1060 6 ISO 4014/4017 10.9 10 60
  40 40 96 70 43 25 1060 6 ISO 4014/4017 10.9 10 60
  50 40 112 84 53 30 1000 7 ISO 4014/4017 10.9 12 100
  50 45 112 84 53 30 1800 7 ISO 4014/4017 10.9 12 100
  50 50 112 84 53 30 2200 7 ISO 4014/4017 10.9 12 100
CAD Typ d D d1 G L2 T nSc screws norm FSc DG TA
  inch inch inch inch inch ft-lbs pcs. mm ft-lbs
  10 0.354 1.535 0.984 0.472 0.394 15 3 ISO 4014/4017 10.9 M6 9
  10 0.394 1.535 0.984 0.472 0.394 15 3 ISO 4014/4017 10.9 M6 9
  10 0.433 1.535 0.984 0.472 0.394 15 3 ISO 4014/4017 10.9 M6 9
  12 0.433 1.732 1.102 0.551 0.512 37 3 ISO 4014/4017 10.9 M6 9
  12 0.472 1.732 1.102 0.551 0.512 37 3 ISO 4014/4017 10.9 M6 9
  12 0.512 1.732 1.102 0.551 0.512 37 3 ISO 4014/4017 10.9 M6 9
  15 0.551 2.047 1.417 0.709 0.591 96 3 ISO 4014/4017 10.9 M8 22
  15 0.591 2.047 1.417 0.709 0.591 96 3 ISO 4014/4017 10.9 M8 22
  15 0.630 2.047 1.417 0.709 0.591 96 3 ISO 4014/4017 10.9 M8 22
  20 0.630 2.362 1.654 0.866 0.669 148 3 ISO 4014/4017 10.9 M8 22
  20 0.709 2.362 1.654 0.866 0.669 148 3 ISO 4014/4017 10.9 M8 22
  20 0.787 2.362 1.654 0.866 0.669 148 3 ISO 4014/4017 10.9 M8 22
  25 0.787 2.598 1.890 1.063 0.748 251 5 ISO 4014/4017 10.9 M8 22
  25 0.866 2.598 1.890 1.063 0.748 251 5 ISO 4014/4017 10.9 M8 22
  25 0.984 2.598 1.890 1.063 0.748 251 5 ISO 4014/4017 10.9 M8 22
  30 0.984 2.992 2.205 1.260 0.827 406 6 ISO 4014/4017 10.9 M8 22
  30 1.102 2.992 2.205 1.260 0.827 406 6 ISO 4014/4017 10.9 M8 22
  30 1.181 2.992 2.205 1.260 0.827 406 6 ISO 4014/4017 10.9 M8 22
  40 1.181 3.780 2.756 1.693 0.984 782 6 ISO 4014/4017 10.9 M10 45
  40 1.378 3.780 2.756 1.693 0.984 782 6 ISO 4014/4017 10.9 M10 45
  40 1.575 3.780 2.756 1.693 0.984 782 6 ISO 4014/4017 10.9 M10 45
  50 1.575 4.409 3.307 2.087 1.181 738 7 ISO 4014/4017 10.9 M12 75
  50 1.772 4.409 3.307 2.087 1.181 1328 7 ISO 4014/4017 10.9 M12 75
  50 1.969 4.409 3.307 2.087 1.181 1623 7 ISO 4014/4017 10.9 M12 75

Characteristics

Shrink discs are the modern method for creating a mechanical shrink fit. The shrink disc consists of either one or two thrust rings with tapered bores and a mating tapered inner ring. By tightening locking screws the thrust rings are drawn together compressing the inner ring and applying pressure to the outside of the hub clamping it to the shaft. Being positioned around the hub there is only one interface transmitting the loads giving the shrink disc method distinct advantages such as offering the possibility of very concentric and well balanced connections that are suited to high speed applications. Traditional shrink fits require complicated calculations, close machining tolerances and fine surface finishes, they also need considerable effort with mounting and removal. The shrink disc connection has none of these disadvantages and is better than any of the other usual connection methods with regard to fatigue strength under alternating torsional stress.

  • Unlimited range of applications – RINGFEDER® Shrink Disc connections are suitable for securing all types of hubs onto shafts and axles. Replacing traditional shrink fits, keys and polygon connections, splined shafts etc. So cog wheels and sprockets, levers, lifters, cam discs, pulleys or brake discs, balance wheels, couplings, slip on gear mechanisms, flanges, pulley wheels and rotors can be attached absolutely reliable.
  • Reduced dimensions – for lower transmissible torques, especially for applications with restricted space.
  • Compensation of small tolerance errorsplease contact our engineers.
  • Maximum reliability – suitable for static, dynamic and impact loads.
  • Simplified manufacture – only plain shaft and bore diameters with easily achieved surface finish and tolerances are required.
  • Easy mounting – no steps, keyways, splines are required, therefore hubs can be located and locked at any point or angle on the shaft. RINGFEDER® Shrink Discs use standard screws tightened with standard tools. No additional machining or fitting work is required.
  • Easy removal – after loosening the locking screws, the RINGFEDER® Shrink Disc will self release and the hub will move freely on the shaft.

Surface finishes

For shaft diameter dw: Peak-to-valley height Ra ≤ 3,2 μm.


Tolerances

For shaft h9

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