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  • Mammut - Smart HMS Locking Carabiner - Screw Gate, Phantom
  • Mammut - Smart HMS Locking Carabiner - Screw Gate, Ultramarine

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  • Mammut - Smart HMS Locking Carabiner - Screw Gate, Phantom
  • Mammut - Smart HMS Locking Carabiner - Screw Gate, Ultramarine

Mammut Smart HMS Locking Carabiner


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    • Screw Gate, Phantom, One Size
    • Screw Gate, Ultramarine, One Size

    3 Reviews



    Mammut equipped the Crag Smart HMS Locking Carabiner with a safety gate to prevent cross-loading while belaying. This safety gate also reinforces the twistlock's closure, making it safer than standard locking carabiners. Mammut designed it to pair with the Smart belay device, but it'll make any belay device easier to handle.

    • Carabiner designed specifically for Mammut's Smart 2.0 Belay Device
    • Locking gate can be unlocked only when the safety gate is opened
    • Keylock nose prevents snagging while taking climbers off belay
    • Item #MAM011H

    Tech Specs

    Gate Type
    locking, screw gate
    safety gate, keylock nose
    Major Axis Strength
    Minor Axis Strength
    Open Gate Strength
    Claimed Weight
    Recommended Use
    Manufacturer Warranty

    Tech Specs

    • Reviews
    • Q & A

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      Love the thick spine and width of the Crag Smart HMS, but the safety gate design is just too cumbersome for me.

      It's effective for preventing crossloading and absolutely bombproof in terms of safety, yeah. But you can't close the safety gate unless the carabiner is fully locked, even if you just have it clipped on your harness/gear sling unlocked for storage (while climbing as a second, for example), meaning the obnoxious plastic arm sticks out. Perhaps it's a petty qualm to have, but it's just enough to annoy me.

      I prefer the Edelrid HMS Strike Slider or Bulletproof Screw FG Locking Carabiner.


      • Familiarity: I've used it once or twice and have initial impressions

      I do not usually have a problem of cross loading but knowing I can belay without the worry of it is really nice! I am a big fan of knowing you can only unlock it by taking off the safety gate as well. I recommend this as a dedicated belay carabiner.

      Safe, secure, good orientation

      • Familiarity: I've used it several times

      Helps keep good orientation. Light, simple, secure. It's a screw-gate under the arm, and the arm only swings into place if the gate is fully closed and screwed so it's a good backup to possible loosening (can't loosen if arm is closed), and you can't use it unless it's screwed shut...