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R+W couplings torque limiters

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Reliable torque overload protection. The usage of ST model Torque Limiters, available from Norman G Clark , minimizes machine downtimes as a result of a crash and ensures the availability and productivity of your machine. ST Torque Limiters are designed for high torque capacities which are achieved by strong modules evenly spread on the circumference.

The R+W torque limiter model ST is based on a spring loaded form fit design. The transmittable torque is determined by the number of modules that are evenly spread on the circumference and their bolt circle diameters. In the event of a torque overload the balls jump out of the detents in axial direction resulting in a permanent separation of the drive and driven elements. An axial force on the plunger re-engages the module. Dust and dirt penetration is prevented by the sealed torque limiter design.

Areas of application of the torque limiter:

  • Excavators
  • Rolling mills
  • Dredgers 
  • Steel mills
  • Turbine construction
  • Large lifting devices
  • Sluice drives    Features
  • Compact, simple design
  • Torsionally rigid
  • Full disengagement
  • Infinite life
  • Precise overload protection
  • Wear and maintenance free
ST Model Specifications

Series    15    30    70
Tangential force (KN) (ranges)    1-4    5-10    8-20
(Adjustment range available from – to)    2-8    10-20    15-40
    6-20    20-35    30-70
Centering diameter modules g6 (mm)    40    70    90
Centering diameter engagement segment g6 (mm)    24    34    44
Centering length modules (mm)     20    35    45
Centering engagement segment (mm)    14    22    30
Overall length (mm)    67    95    135
Outer diameter (mm)    59    100    129
Bolt circle diameter (mm)    50    86    110
Diameter control scale (mm)    16    28    35
Outer diameter graduated collar (mm)    44    75    92
Screw / tightening torque ISO 4762 (mm)       6xM5 x 1 /10Nm    6xM8 x 25/40Nm    6xM12x35/120Nm
Screw / tightening torque ISO 4762 (mm) E2      M4 x 14 4,5Nm    M6 x 20 15,5Nm    M8 x 25 38Nm
Flange thickness (mm)    7    12    16
Distance (mm)    5    8    10
Actuation path (mm)    4    7,5    10
Distance dimension (mm)    2    3    4
Radius (mm)    110    200    250
Inner thread (mm)    M8 x 15    M10 x 25    M16 x 30
Distance ± 0,1 (mm)    36    60    79
Weight (kg)    0,65    2,7    6

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