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Mammut Smart HMS Locking Carabiner


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Smart HMS Locking Carabiner

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

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

Tech Specs

What do you think about this product?


>Rating: 3

Gets it done

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

It's a belay biner, with an extra safety feature with the clip that keeps the screw locked down and prevents cross loading. Honestly, more than I wanted to deal with as an experienced climber, but this would be very good for beginners or groups!

>Rating: 3

Adequate is a good word

I've used it several times

To be honest, this is not my favorite carabiner around. I liked the idea of it, but in practice I find it quite annoying. I picked this up to go along with my Smart 2.0 belay device. It seems pretty structurally sound and does prevent cross loading the carabiner, however there are other biners on the market that are more user friendly. I hate that you have to have the biner entirely locked to have the block clipped to the gate and there is no easy way to clip or unclip this quickly. So it's a hassle to clip this to anything since the block then swings free and snags on stuff unless this is locked. It's not a very streamlined design and I only use this climbing indoors because it annoys me clipping it to my harness with the block swinging loose.

>Rating: 3


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.

>Rating: 5


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.

>Rating: 5

Safe, secure, good orientation

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...