blocfor® B20 Web 20 ft. Self Retracting Lifeline


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The Tractel blocfor® B20 web self-retracting lifeline provides freedom of movement to workers performing their job at various heights. The device automatically takes up the slack in the strap, keeping it out of the way while minimizing the free fall distance, should a fall occur. In the event of a fall, the sudden jerk in the strap will activate the centrifugal locking mechanism, arresting the fall within less than 40 in. (1 m).

Very lightweight and easy to handle, the blocfor® B20 features an ergonomic design with corrosion resistant components. In the event of a fall, the drum is locked by a single pawl which engages in a ratchet wheel under the effect of the centrifugal force caused by the acceleration of the falling weight attached to the web lifeline.


  • Synthetic casing for added durability
  • Very lightweight and easy to handle
  • Impact-indicating snap hook
  • Rubber recoil bumper
  • Corrosion-resistant components
  • Twin stainless steel disc brakes with copper/alloy coil in the centre (all parts are anti-spark)
  • Twin inertia and speed-activated brake pawls are designed to activate and engage at the same time
  • Capacity 310 lbs. (140 kg), one person
  • No annual factory re-certification
  • Patented system
  • Integrated energy absorber
  • Lower cost of ownership
  • Leading edge capability
  • Automatically eliminates rope slack


  • Ships  
  • Towers  
  • Quarries  
  • Tanks  
  • Silos  
  • Shafts  
  • Pipeways  
  • Construction sites  
  • Fixed ladder  
  • Manholes  
  • Aircraft maintenance  
  • Railroad sidings  
  • Tank truck loading/unloading facilities  
  • Any elevated work station


  • ANSI Z359
  • OSHA 1926  
  • CSA Z259.2.2-98
blocfor® B20 Web 20 ft. Self Retracting Lifeline