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Black Diamond
RockLock Twistlock Carabiner

4.6909090909090905 out of 5 stars
55 Reviews
Current price: $17.21 Original price: $22.95
25% off



RockLock Twistlock Carabiner

Black Diamond's RockLock Twistlock Carabiner automatically locks after you set the belay for your climbing partner. That means no more looking down and noticing an unlocked gate after you told your partner to climb on. Black Diamond also designed this locker with a keylock nose for snag-free unclipping, a curved spine for a larger gate opening, and a square hinge to hold your belay device in place.


  • Black Diamond's biggest locking carabiner outfitted with a twistlock
  • Twistlock automatically locks gate and twists to unlock
  • Keylock nose eliminates snagging when unclipping
  • Item #BLDZ973
hot forged aluminum
Gate Type
keylock nose, one-hand operable, typeH or HMS connector
Major Axis Strength
Minor Axis Strength
Open Gate Strength
Gate Opening
Claimed Weight
Manufacturer Warranty
1 year

Overall Rating

4.5 based on 55 ratings

Review Summary

1 Stars - 1 reviews
2 Stars - 1 reviews
3 Stars - 2 reviews
4 Stars - 6 reviews
5 Stars - 45 reviews

What do you think about this product?


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5 out of 5 stars

May 3, 2024

Smooth operator

Love this carabiner for - belaying from above - rappelling on a munter It’s smooth, it autolocks. What more can you want?!

Roxanne B.

Originally reviewed on

5 out of 5 stars

April 9, 2024

Quality 'Biner

As always, BD equipment is top-shelf. A great addition to my rack.

Tom W.

Originally reviewed on

5 out of 5 stars

April 8, 2024

Smooth and easy

Great carabiner for gri gris and setting anchors! Quick fast and smooth operation so far (used for three trips). Seems like it will hold up to abuse for years as well!

Turner C.

Originally reviewed on

5 out of 5 stars

April 6, 2024

Good quality quick lock carabiner

I like the size and ease of use. Finish is smooth as well.

Charles W.

Originally reviewed on

5 out of 5 stars

February 20, 2024

RockLock Twistlock

I normally use them for my anchore system, they are durable and don't wear out quick with the rope.


Originally reviewed on

3 out of 5 stars

February 19, 2024


I didn't look hard enough before I ordered. I didn't realize that they were made in Taiwan until I received them.

Diana H.

Originally reviewed on

5 out of 5 stars

November 26, 2023

Killer product

Twist mechanism is easy to work but feels really secure. Lightweight, strong, reliable. Everything is to love!

Zachary A.

Originally reviewed on

4 out of 5 stars

November 22, 2023

Nice to have

I like having the extra security of the twist lock on my belay device. The motion is a bit tricky with one hand, but I'll get used to it.

Bradley T.

Originally reviewed on

3 out of 5 stars

August 14, 2023

Fast but has increased risk in some use cases

As a gym or TR belay carabiner it’s great for increasing efficiency and safety between laps. However, there is real risk in either the rope or a belay loop briefly rubbing the gate causing it to open. I have seen the gate open while 3 pitches up due to contact with the rope while pulling it for rappel. I would recommend this for gym or TR use but not for multi-pitch or alpine use where complex rope management and awkward belays are more common.

Casey S

Originally reviewed on

5 out of 5 stars

June 6, 2023

Excellent belay locker

Great belay locker, and nice action on the twistlock.

Wren C.

Originally reviewed on