Conlok® Galvanised Through Boxes

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Features & Applications

Conlok® Galvanised Through Boxes. Hot dip galvanised through boxes available for 20 and 25mm conduit.

Unthreaded for use with standard galvanised conduit tube. Unique grub screw locking - no need to thread conduit .


  • 20mm & 25mm options available
  • Conforms to BS EN 61386-21:2004 (Conduit Systems for Cable Management - Rigid Conduit Systems)
  • Simply use M4 grub screws (supplied).
  • Manufactured in accordance with the Low Voltage Directive 2014/3/EU


  • All Conlok products are IP30 (Ingress protection) rated - meeting the same rating as traditional conduit systems
  • Tensile force of 100N and 500N (heavy & medium grade) was applied for 2 minutes, the samples remained properly assembled to the conduit.
  • Suspended load test: when a load of 450N was applied for 48 hours, the samples passed due to there being no cracks nor deformation to the conduit.
  • There is no need for threading machines & associated electrical equipment (transformer/leads)
  • No need for threading oil
  • No metal filings (from threading) to clear up/dispose of.

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