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DMM 12mm Steel Boa

DMM 12mm Steel Boa


The 12mm Boa HMS in steel has all the strengths and versatility of its alloy sibling, but has a rated strength of 40kN! It can be used for many applications where a large gate opening or large internal volume are required. The smooth rounded internal form is very useful when rotating the carabiner through attachment eyes and the basket curves nicely to allow central hanging of loaded components (minimising the scary clicking associated with extreme D shaped connectors).


  • Conforms to EN362:2004/B
  • Also available pre-drilled with a captive bar option conforming to EN362:2004/T
  • HMS shape provides large internal volume and gate clearance
  • Smooth internal shape for ease of rotation through attachment eyes
  • 12mm bar section for maximum strength
  • Cold forged and fully heat treated carbon steel for high strength and durability
  • Zinc plated to EN ISO 2081:2008 Fe/Zn 5c standard for corrosion protection
  • Recommended as a belaying carabiner in conjunction with dynamic nylon ropes
  • Individually marked for traceability
Variant Strength (Gate Closed) Strength (Gate Open) Strength (Minor Axis) Gate Opening Weight Cat no
Steel Boa Screwgate 40kN 12kN 9kN 24mm 266g C852
Steel Boa Quicklock 40kN 12kN 9kN 23mm 277g C853
Steel Boa Locksafe 40kN 12kN 9kN 23mm 278g C857

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