Build My Own FeedCarabiner Testing Video
Our QA team breaks hundreds of biners a year during the design and manufacturing process. This video illustrates the three different configurations we use when pull-testing our carabiners; closed gate, open gate and minor axis. In addition to these batch tests every single carabiner is tested to one half of it's rated strength.
Black Diamond Carabiner Testing Video from Black Diamond Equipment on Vimeo.
United States / English 
24 Jul 2011, 9:22PM
@WZ, that MP post is clearly a hoax, as the video he posted eventually showed. I'm not saying gear doesn't fail or that what he claims isn't possible, it just clearly did not happen the way he said it. An unfortunate scare to many climbers that is (as posted) unfounded.
27 Jun 2011, 3:35PM
Do you do harness testing also? Looking for info to refute: http://www.mountainproject.com/v/black-diamond-aspect-climbing-harness-failure-warning-long-post/107190824#a_107190932
21 Jun 2011, 2:39PM
@graham
The reason for no "biner to biner" is that is cannot properly absorb a dynamic loading event. If one is at the anchor and constantly loading it, there is no dynamic event, but it is a bad habit to get into. One should NEVER clip "biner to biner" on lead or in anchor construction.
11 May 2011, 4:31PM
I was out at a local crag with a friend when he clipped his safety -biner to biner- and I told him that you should never clip a biner to a biner and always have sling to biner to sling. He asked why and I couldn't recall exactly why but just know thats how you do it. For example if your extending a quick-draw attach the second draw to the webbing, or dogbone, of the first draw and not the second draws biner to the end of the first draws biner if that makes sense. Can you give me a good reason why so I can pass on that reason to my friend?
13 Aug 2010, 5:36AM
Wow, you guys break hundreds of biners a year?? How about giving them to me instead? ;)
Seriously, though, it's nice to know BD has extensive gear testing and quality checking services... Now I feel even safer using my Rocklock!