Locking Carabiners

Locking carabiners require at least two separate actions to open the gate so they are much less likely to accidentally open compared to non-locking "snapgates".

As a result they take longer and are more fiddly to open and close, so their use is more suited to connections that won’t be changed frequently or for rigging that is out of sight.

Common uses of locking carabiners are:

  • Attaching a descender or belay device to your harness.
  • The anchors on a top rope.
  • Rigging a pitch in a cave.

Popular Locking Carabiners

  • Sale

    Petzl OK Oval Carabiner


    In stock

    Select options
  • Sale

    Petzl Attache HMS Carabiner

    Original price was: £16.00.Current price is: £14.71.

    Out of Stock

    Read more
  • Sale

    Petzl Am’D Carabiner


    In stock

    Select options
  • Sale

    CT Lime Carabiner


    In stock

    Select options

All locking carabiner products

Quality lockable carabiners

From brands you can trust

Serious climbers and cavers like you understand the critical role that gear plays in your pursuit of new heights and depths. That's why Inglesport has curated a selection of the finest locking carabiners from trusted brands, ensuring you have access to the best that the industry has to offer.

Remember, at Inglesport, we're more than just a retailer. We're climbers, cavers, adventurers, and enthusiasts, just like you. We're here to share our expertise and ensure you find the perfect locking carabiners for your unique journey.

DMM Climbing: Why we stock and support them

Related Blog Post

DMM Climbing: Why We Stock & Support Them

Explore why Inglesport champions DMM Climbing for top-quality climbing and caving gear, highlighting our commitment to safety and innovation.

Frequently asked questions

  1. Screwgate: A barrel is screwed several turns to cover the nose once the gate is closed. Screwgates can be left unlocked, so they are quicker to clip, then locked afterwards. It is good practice to have the screw barrel pointing downwards as vibration can cause it to rotate; if it’s pointing upwards this can cause it to unlock.
    • Best for – Most cases where a locking carabiner is needed, particularly if it needs to be clipped quickly but then can be locked afterwards. They cope with dirty environments better and tend to be cheaper.
      Downsides – You can forget to screw them up. The barrel can vibrate open.
  2. Twistlock: The barrel is rotated about a quarter of a turn and then the gate can be opened. A sprung mechanism closes and locks the gate when it is released. They can’t be left unlocked.
    • Best for – Connections that will be opened often but need the security of a locking carabiner.
    • Downsides – More difficult to open so harder to use in a hurry. Certain types of loading could open the gate; this is known as ‘rollout’.
  3. Triple action (tri-act): Like a twistlock but the barrel needs to be pushed towards the nose then rotated before the gate can be opened.
    • Best for – Connections that don’t need to be opened very often.
    • Downsides – Very fiddly to open, takes practice to be slick with their operation.
  4. Other types: Some other variants exist. These include four-action locking or requiring a tool to unlock the gate.

Locking carabiners require at least two separate actions to open the gate so they are much less likely to accidentally open compared to non-locking "snapgates".

It is possible for a snapgate carabiner to become detached if it twists or if the rope presses on the gate. Obviously this can have serious consequences. Even if it doesn’t become detached, opening the gate of a carabiner under load reduces it’s strength by around two thirds.

As the name suggests, auto-locking carabiners lock themselves as soon as the gate is released. This makes them very secure but the complex mechanism in the gate is more prone to damage from dirt and grit.

The reverse of locking. Remember twistlock and triple action carabiners can’t be left unlocked like a screwgate. If you’ve just bought a carabiner with a locking gate that you aren’t familiar with, practice opening and closing it a few times before you have to rely on it.

Try cleaning it in water, ‘wiggle’ the gate and operate it a few times to try to free it. Using warm water with some mild detergent can help. Afterwards, if it doesn’t operate smoothly and without a gritty sound then you need to clean it some more. After that let it dry then apply a small amount of lubricant to the gate, barrel and pivot. The manufacturers instructions will give more details on exactly what they recommend.

The minimum breaking strength of a carabiner will be marked on it in kilonewtons (kN) along with some arrows to show the orientation; 1kN is about 100kg. The markings may just show only the end-to-end strength, known as the major axis. Others may also show the "cross gate" and "gate open" strength as well depending on which standard it is certified to.

According to European standard EN12275, locking carabiners must have a minimum breaking strength of 18-25kN on the major axis (end-to-end), depending on their shape. "Cross gate" is 7 or 10kN and "gate open" between 5 and 8kN. Again this depends on their shape.

European standard EN362 requires 20kN or 15 unlocked on the major axis.

A carabiner must be approved to either one or both standards to get it’s CE certification and be sold in the UK and the EU.

Some carabiners are only rated for accessories or attaching things to your harness. If they just have a strength with no direction arrows and no CE mark then they shouldn’t be used to support people.

These are the class or classes that the carabiner is approved to. 

Yes, locking carabiners are best for top rope anchors, like any fixed rigging. The carabiners will be out of sight so you can’t see what’s happening as the load is applied and things start to align. As a result, the security of locking carabiners makes a lot of sense.

Why choose Inglesport?

Sophie Daniel

Such a great online shop. I live in Cornwall but I am originally from Yorkshire. I've started always checking their online shop before anywhere else now as they have a great range, good prices and really fast shipping. I like supporting an independent business in my home county!!

Richard Bunting

After searching for a black Rab Valiance jacket in a size medium for a few days with no luck I came across one on the Inglesport website via Google ads. The price was very reasonable with free postage. I ordered the jacket and it arrived the next day. I’m very happy with the fast and efficient service from This shop and cannot recommend them enough. Absolutely 5 star.

Kirsten Amor

The devil works hard, but the team at Inglesport work harder. This place has everything you need for caving, hiking, and climbing. I bought my caving fleece, oversuit, wellies, and other accessories here and there was loads of advice on the site about what to go for. Only a few hours after I placed the order, right in the middle of the post-christmas shopping hubbub, I get a message saying it had already been sent off! I wasn't entirely sure about sizing so ordered an extra oversuit to check, and eventually returned the other one. They sorted the refund the day the suit arrived, no issues whatsoever. Great products, fast service, expert advice, what more could you want?

Keri Smallwood

I have bought from here several times via their ebay shop and direct from their online store. Always had fast delivery and good customer service. Although their prices are generally higher than other caving stores, their postage prices are more reasonable in comparison and they are the only store that offers free postage over £50.

Proper Job

Great service and fast delivery. Price on the jacket was unmatched.


Local Expertise

Knowledgeable staff with first-hand experience in outdoor activities.


Quality Assurance

Only the best products from top brands.


Fast Shipping

Quick delivery options for eager adventurers.


Dedicated Support

Always ready to assist with any enquiries.