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Petzl Am'D Twist-Lock Review

A high quality auto-locker that is an all-around solid performer
Petzl Am'D Twist-Lock
Petzl Am'D
Credit: Petzl
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Price:  $21 List | $20.95 at REI
Compare prices at 2 resellers
Pros:  Great size-to-weight ratio, keylock, all around performance
Cons:  Not as friendly for leftys or small hands, not as functional as HMS shapes
Manufacturer:   Petzl
By Ryan Huetter ⋅ Review Editor  ⋅  Nov 16, 2016
Our Editors independently research, test, and rate the best products. We only make money if you purchase a product through our links, and we never accept free products from manufacturers. Learn more
  • Function - 30% 8.0
  • Ease of Unlocking and Locking - 25% 7.0
  • Compactness lightweight - 20% 6.0
  • Gate Clearance - 15% 9.0
  • Gate Hang Up - 10% 7.0

Our Verdict

The Petzl Am'D Twist Lock carabiner is a versatile D-shaped locker that offers something for everybody. It is larger than the typical HMS shape that is so often seen paired with a belay device, but not as large as the big lockers like the Black Diamond RockLock Screwgate. It is the only twist lock style auto-locking carabiner in this review, an option that is appealing to those looking to ensure closure in critical locations like belays and personal anchor tethers. It comes in three gate closure options: traditional screw, twist lock and ball lock. The oversized D shape is a very strong one, and the Am'D is only second in strength to the Omega Pacific ISO Standard Locking D, but at a much lower weight, making this strength-to-weight ratio very favorable. The newest version of the Am'd uses I-beam construction, reducing its weight, but it also became less durable as a belay biner. If you are looking for a budget option for belaying or for top roping, look at a more solid stock locker like the Mad Rock Ultra-Tech HMS.

Our Analysis and Test Results

Performance Comparison


This locking carabiner is an all-around locking carabiner that performed well during a variety of applications during our review. We tested the twist lock version and were impressed at its use with belay devices, no matter the style, and appreciated the assurance that the gate would not open by accident or due to gate shutter. It has an I-beam type construction but still bulks up on material around the rope-bearing areas at either end of the spine, giving it a bit better durability when used for top rope anchors or belaying and rappelling. The oval shape that the I-beam construction imparts increases the friction when used as a belay locker or when belaying seconds in guide mode. For these, using a rounder stock like on the Black Diamond RockLock Screwgate will give a smoother feed.

Petzl Am'D Twist-Lock locking carabiner - even though its d shape is not the best for belaying with munter...
Even though its D shape is not the best for belaying with Munter hitches, the Am'D features a much larger basket than most, making it work well for this task.
Credit: Ryan Huetter

Ease of Locking and Unlocking

The Petzl Am'D Twist Lock is one of only two auto-locking carabiners in this review, alongside the Black Diamond Vaporlock Magnetron. While the auto-locking feature is not always the best or most convenient choice, we do like it in some cases. Clipping into your belay device to belay or rappel, or attaching your personal tether to anchor when cleaning a pitch, or rappelling a multi-pitch route are a some of the scenarios where we found it handy to have the auto-lock function.

The Petzl Twist Lock is smooth to open, requiring only a quarter turn to open. This might be a hazard if leaving this unattended at a top rope anchor where the locker might be lying on the rock; using an auto-locker is not a substitute for redundancy. The twist lock is ergonomically shaped and features small cutouts to increase grip, especially when using gloves. But the cutouts don't go all the way around, so left-handed users don't get the same benefit.

Petzl Am'D Twist-Lock locking carabiner - the twist lock works well for right-handed users, thanks to the...
The twist lock works well for right-handed users, thanks to the ergonomic grip, but it doesn't work as great for leftys.
Credit: Ryan Huetter


This large locker is one of the biggest in the review, though not as huge as the BD Rocklock Screwgate. Its size makes it useful for a variety of uses, though we would not want to have to carry more than a couple of these up a long route or deep into the backcountry. For such big size, though, Petzl maintains a relatively lightweight with the Am'd, and at 70 grams is still light enough to consider bringing them along instead of the also auto-locking BD Vaporlock Magnetron, or the even smaller and lighter Edelrid Pure Screw.

Petzl Am'D Twist-Lock locking carabiner - on the way up polemonium peak in the high sierra, luis is happy to...
On the way up Polemonium Peak in the High Sierra, Luis is happy to be clipped in to an auto-locker like the Petzl Am'd
Credit: Ryan Huetter

Gate Clearance

With a gate clearance of 2.5 cm, the Petzl Am'd has the widest opening of any locker in our review. We really liked this fact when we had to clip into fat master points on anchors that were made from thick static rope or cordalettes, or at fixed anchors comprised of many slings. It also made it easy to capture multiple bight knots, such as when clipping backup knots ascending ropes with mechanical ascenders. The BD RockLock has a slightly smaller opening with 2.3 cm of clearance.

Petzl Am'D Twist-Lock locking carabiner - clipping big fat master points is no big deal with the large gate...
Clipping big fat master points is no big deal with the large gate clearance.
Credit: Ryan Huetter

Gate Hang Up

We like the narrow keylock nose on this contender, a feature that makes clipping bolts, gear, and ropes under load a breeze. This is a standard feature on locking carabiners nowadays, and regardless of what locker you decide on it does not make any sense to choose a traditional notched nose design.

Petzl Am'D Twist-Lock locking carabiner - for clipping into anchors with a personal tether, the am'd was one...
For clipping into anchors with a personal tether, the Am'D was one of our favorites. Auto lockers like this one help you from forgetting to lock the carabiner.
Credit: Ryan Huetter

Best Applications

The Am'D is a good all-around locking carabiner that gives its users peace of mind thanks to an auto-locking twist lock closure system. Having a couple of these large D-shaped carabiners for use at anchors and for belaying makes life a lot easier and less cluttered. The Am'D performs well across a variety of applications and could be considered as a jack-of-all-trades.


For $21, this is not an inexpensive locking carabiner. It is less expensive than our other auto-locking carabiner reviewed here, the BD Vaporlock Magnetron, by $10. It is a good, though not great value, but if you are searching for an auto-locker, which are generally pricier than screw lockers, we recommend the Am'D.


Climbers who are looking for a full-sized, functional locking carabiner that is a capable performer with a reasonable weight will like what the Petzl Am'd offers.

Other Versions

Petzl Am'D Screwlock
Petzl Am'D Twist-Lock locking carabiner - petzl am'd screwlock
Petzl Am'D Screwlock
Credit: Petzl
  • Cost - $15 ($5 less expensive)
  • Same shape as Twist Lock model
  • Red safety stripe

Ryan Huetter
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