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DMM Boa 30kN HMS Screwgate

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The DMM Boa 30kN is a super strong HMS specifically designed for the toughest and most demanding rigging scenarios. In spite of its incredible strength and durability, thanks to the now well familiar I-Beam construction, this BIG Boa is, at 95g, surprisingly light.

The Boa is a large and very strong offset HMS carabiner with a massive gate opening (24mm). The offset shape gives the Boa a lot of extra strength without compromising it's core function as a HMS this means that not only can it handle standard HMS duties well - belaying italian hitches - but it provides a lot of extra capacity and safety when it comes to rigging.


  • Large clean nose HMS Belay Biner thanks to the Keylock 
  • I Beam back construction to save weight (almost 25% reduction)
  • Big and beefy
  • Clean nose HMS belay carabiner
  • Large gate opening
  • Great for rigging and belay situations: can accommodate several knots 


  • Gate Clearance mm: 24
  • Gate Closed kN: 30
  • Gate Open kN: 12
  • Keylock: Yes
  • Minor Axis kN: 16
  • Width Widest mm: 8.2
  • Length: 12cm
  • Manufacturer: DMM
  • Material: Alloy
  • Mpn: A902
  • Weight: 95g

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  • Reviews (2)
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Mark S.

I needs to balance out

I needs to balance out the strength across my HMS biners for rope anchors and room was getting tight at times when multiple ropes, and other equipment were running through my others. I bought 5 30Kn Boas to give me a balanced high level of strength across them and the room in the biners is excellent. Add to that the impressive aesthetics of DMM equipment and I'm very content, an excellent product.

Kass G.

I wanted a big biner

I wanted a big biner for building belay stations. The DMM Boa 30kN absolutely swallows a couple of hitches with zero hassle fitting them in or closing the gate. Recommended without reservation.


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