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Climbing | Hardware | Screw-Gate Karabiners


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DMM Big Boa HMS Screw Gate
Product Code A892



15.00


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The DMM Boa is the rigging carabiner of choice for many climbers and it has proved to be one of our most popular carabiners over the last few years.

The fact that the Boa's popularity has spread across into the industrial, arborism and technical rescue markets is proof that we managed to get the fundamental design and performance characteristics pretty much correct.

We have just finished revamping the Boa and it now features a fully I Beamed hot forged back and a keylock nose. This has had a dramatic effect on the weight and the Boa Screwgate comes in at a svelte 82g - which is remarkable considering its size.

It works so well because the offset HMS shape makes it massively versatile and very strong - it operates both as a very good belaying carabiner and as a rigging biner.

On belaying duty it works well with belay devices of all sizes - we designed the top bar so that its curve does enter the belay device itself and jam the ropes, whilst its smooth profile and massive 11.4mm rope radius means that it also works well with an Italian hitch.

On rigging duties its massive internal space means it eats up ropes and slings and is perfect for creating centralised anchor points. The slight offset shape also forces the load towards the spine increasing the carabiners strength.

The new Boa also features our new super strong 7075 barrel that resists cross loading forces and makes its use with figure of eights potentially much safer.



  • Weight: 83g
  • Strength (gate closed): 25kN
  • Strength (gate open): 8kN
  • Strength (minor axis): 10kN
  • Gate Opening: 25mm
  • Rope Bearing Surface Width: 11.4mm
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