Sikkerhetskoblinger EX /IEC EX

The safety-integrated connections Corrosion proof HKDS metal multiple disc couplings compensate a parallel misalignment up to ±0.5 mm and an axial misalignment up to ±1 mm as well as extending the service life of encoders in the process.

They are safety components in accordance with DIN EN ISO 13849-2 (PL e) with CE declaration of conformity and designed in high safety factors relating to fatigue resistance and fault exclusion. In addition, it is possible to implement failsafe encoder attachment solutions in potentially explosive atmospheres. As a consequence, they are ideal for extreme operating conditions. Double joint couplings are available with different hub lengths and bore diameters in addition to insulated coupling versions for attachments where the risk of shaft currents is a concern.

  • For encoder attachments requiring functional safety (PL e)
  • Play-free, torsion resistant and failsafe
  • Extends service life of encoders
  • Options: Insulated version (HKDSI 5) or Ex certified version (HKDS 5 Ex)

Technical Data
Attribute                                             Value
Product usage                                  Compensate axial misalignment
                                                            Compensate parallel misalignment                
                                                            Attachment points with functional safety
                                                            requirement (SIL/PL) 
                                                            Attachment points in potentially explosive
                                                             atmospheres (ATEX / IECEx)
                                                             Insulate against existing bearing/shaft
Coupling specification                     HKDS 5… / HKDS 5... Ex:  Stainless steel
                                                            HKDSI 5…: Stainless steel coupling with
                                                            plastic insulating bushing                                                                                                                                                    (electrically isolated)
Bore drive side                                 Ø 22 mm with keyway
Bore encoder side                           HKDS 5… / HKDS 5... Ex:  Max. Ø 22 mm
                                                            with keyway
                                                           HKDSI 5…: Max. Ø 10-14 mm with keyway
                                                            (plastic insulating bushing)
Outer diameter                               Ø 54 mm
Total length                                      68 - 120 mm
Mounting accuracy                         Radial misalignment: up to ±0.5 mm / axial
                                                           misalignment: up to ±1.5 mm
Maximum rotation                         6000 rpm
Temperature range                        HKDS 5…: -50 °C to +120 °C
                                                          HKDSI 5…:  -25 °C to +85 °C 
                                                          HKDS 5… Ex: -50 °C to +70 °C
Shock resistance                            10 g (briefly 100 g)
Vibration resistance                      3 g (briefly 20 g)
Insulated against currents           HKDS 5… / HKDS 5... Ex: No
                                                         HKDSI 5…:  Yes
Mechanical options                       Insulation against bearing/shaft currents
                                                          (type HKSI)
                                                         Attachment to larger shaft diameters
                                                         possible with adapter shaft
Special features and certificates
Designed as safety component with fault exclusion to DIN EN ISO 13849-2 (up to PLe), with CE declaration of conformity
Additional safety claws ensure availability even if spring washers fracture due to overload
Spring washers made of high tensile steel with special corrosion protection 
Certified for Ex zones 1 and 2 (gas) as well as 21 and 22 (dust); insulated version type HKSI 5… not available for Ex applications due to the risk of build-up of electrostatic charge (plastic).