Cable Penetrator for 8mm Cable

5.40 EGP

This cable penetrator makes a waterproof, high-pressure seal to pass the Fathom Tether or other thick cable into a watertight enclosure. Each set includes a bolt, nut, and O-ring. Some assembly required.

Out of stock

This cable penetrator is a simple solution to waterproofing your robot. It’s basically a bolt with a hole that the tether or other thick cable can be glued into to provide a waterproof, removable connection through watertight enclosures, boxes, panels, etc.

This particular penetrator has a extended length head and nut to make it easy to install and remove on an enclosure, even on densely packed end caps like the 4″ Series 14-Hole end cap. That’s perfect for a tether or other cables that you would like to install and remove frequently.

We recommend Loctite Marine Epoxy and the Potting Kit to complete assembly.


  • Extended length head and nut for easy installation/removal
  • Anodized aluminum construction for corrosion resistance and high strength
  • Captive O-ring face seal that works on any smooth surface
  • Wrench flats for easy tightening
  • Multiple inner diameters to secure the cable jacket but leave room for potting compound
  • Works for cables smaller than 8mm as well


  • 1 x 8mm Cable Penetrator Bolt
  • 1 x Cable Penetrator Nut
  • 1 x O-Ring


Recommended through-hole diameter 10 mm
Bolt Threading M10 x 1.5
Bolt Length 0.98 in 25 mm
Bolt Head / Nut Diameter 0.71 in 18 mm
Wrench Flats 0.63 in 16 mm



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