3504445 – Ultra-Lok (SRL) Self Retracting Lifeline – 20 ft. (6.1m) – Galvanized steel cable w/ steel swiveling carabiner – Single leg – Anchorage loop for mounting

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  • 20 ft. (6.1m) – 3/16″ (5mm) galvanized steel wire rope
  • Swiveling anchorage point – for anchoring SRL
  • Galvanized steel snap hook – for harness attachment to prevent falls
  • Internal energy absorber
  • Equipped with 3M™ Connected Safety ID (CSID)
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20 ft. (6.1m) of 3/16″ (5mm) galvanized steel wire rope with swivel carabiner.

    • Single leg – 20 ft. (6.1m) of 3/16″ (5mm) galvanized steel wire rope
    • Swiveling carabiner on end of lifeline for attachment to support structure
    • Swiveling anchorage loop for SRL mounting
    • Reserve lifeline system
    • Energy absorber saves lives by absorbing deadly falling forces
    • Long lasting – Semi-sealed design protects moving parts from grime, dirt & sludge

Self-retracting lifelines (SRL's)

An SRL is an alternative to traditional shock absorbing lanyards and work a lot like a seat-beat - pull out slowly and extend the line; but don;t you try to run with it.

These devices are specifically designed for professionals who work way up high - stopping falls within inches to allow great mobility.

Real quick - whats an SRL?
  • Retractable lifelines designed to stop a fall within inches.
  • Constantly under tension, but extends or retracts as the user moves up and down.
  • Offers greater protection then a shock absorbing lanyard.

TL;DR - Self-retracting lifelines connect a harness to an anchor and offers great fall protection than a simple lanyard.


Ultra Lock SRL's are rugged, lightweight & high quality devices you can trust with your life.This long-lasting SRL is a beautiful culmination of stainless steel parts, anti-ratcheting brake system and a semi-sealed design.
All 3M Fall Protection SRL's are backed by decades of experience, research & proven results.
  • Rugged design, semi-sealed for longevity
  • Lightweight thermoplastic housing can take a beating whilst remaining lightweight
  • Stainless steel moving parts products by semi-sealed design
  • Anti-ratcheting twin disk braking system is constantly moving, limiting lock-ups
  • Swiveling anchorage point allows for more flexibility and freedom of movement
  • Snap hook is user friendly, and features an easy-to-read impact indicator for quick inspections
  • Reserve lifeline system
  • Ergonomic handle equipped with 3M™ Connected Safety ID (CSID).
  • Includes both INTERNAL & EXTERNAL shock absorbers to reduce falling forces in event of fall. (LE models)

Additional information

Weight11.10 lbs
Dimensions10.5 × 6.9 × 3.10 in
Connection Material

Galvanized steel

Lifeline Material

Galvanized Cable

Hook type to Harness


Hook type to structure

Anchorage loop

Overall Length

20 ft. (6m)


Product Family

SRL Application

For vertical use

Lanyard Leg Count



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