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  • Large expansion ranges create generous overlaps between sizes, allowing you to carry fewer pieces and still cover your bases
  • C-loop continuous cable stem is strong and durable; rigid stem makes for easy placement, yet remains flexible even in cold weather
  • Ergonomic trigger permits individual manipulation of cams and can be pulled easily with gloved hands
  • Wide cam lobes distribute the load on soft rock; overall width of unit is narrow for better placement in shallow cracks
  • Cam lobes and sewn-on nylon sling are color-coded for easy identification

Made in USA.

Available in 10 sizes; see specifications listed below for size = range / strength / weight / color:

  • 0.3 = 13.8 - 23.4mm / 8kN / 75g / blue
  • 0.4 = 15.5 - 26.7mm / 10kN / 83g / gray
  • 0.5 = 19.6 - 33.5mm / 12kN / 99g / purple
  • 0.75 = 23.9 - 41.2mm / 14kN / 119g / green
  • 1 = 30.2 - 52.1mm / 14kN / 136g / red
  • 2 = 37.2 - 64.9mm / 14kN / 155g / yellow
  • 3 = 50.7 - 87.9mm / 14kN / 201g / blue
  • 4 = 66.0 - 114.7mm / 14kN / 289g / gray
  • 5 = 85.4 - 148.5mm / 14 kN / 380g / purple
  • 6 = 114.1 - 195.0mm / 14 kN / 557g / green

View all Black Diamond Cams

REI membership


Best Use Rock Climbing
Expansion Range 13.8 - 195.0 millimeters
Strength 8 - 14 kilonewtons
Weight 75 - 557 grams
Rated 5 out of 5 by from Industry standard The industry standard for SLCDs. These things are sort of the jack of all trades. Not the lightest unit, or the one with the best expansion range in class, but they are durable, easy to place, and don't have any significant drawbacks that one often has to put up with in ultralight or super-expansive cams. Trigger operates smoothly. After a few falls on some of the units at weird angles, the stems as still straight and trigger wise are in good shape. Would definitely buy these again, though I'll probably never have to.
Date published: 2013-04-11
Rated 5 out of 5 by from Solid and easy to place The backbone of any trad rack. The dual axle not only increases the range, but makes placement feel simple. I preferred other cams until BD updated the C4 with a thumb loop. Now I've got the .4 to 4 and take them on a route before anything else. In smaller sizes, however, I prefer the more solid TCU. The only con is that I've found they are sometimes harder to work free from a tricky placement than other cams I've used. I also wish they came in discounted sets, maybe .3 to .75 and 1 to 4.
Date published: 2007-11-14
Rated 5 out of 5 by from Industry Standard- Bomber Just like all Black Diamond gear, the C4's work exactly as stated and designed. When placed properly, I've never heard of one failing. The color does get scratched, but that's to be expected with climbing. I'd recommend getting a Neutrino set of biners, since the C4's and the Neutrinos are the same colors. Lastly: If these fail, it's most likely due to user error, not gear failure. Be safe and take a class or learn from someone with tons of experience!
Date published: 2012-09-27
Rated 5 out of 5 by from The gold standard in camming devices Black Diamond put some serious research and development into this product and the result is the gold standard in Active Protection. I use sizes .5-4 and they inspire confidence in most every placement
Date published: 2011-10-28
Rated 5 out of 5 by from Amazing confidence You wont find a better cam on the market in my opinion. I have yet to see a cam as smooth and easy to use with the versatility of the C4. The Trango Flex cams are very similar and would also recommend them. When you are looking for that quick and easy placement with little to no effort needed, whip out one of these bad boys and place away. I have a partner that is die hard passive pro, but will always reflects on how bomber my C4s are when he seconds. Wouldn't know how I would live without my C4s.
Date published: 2010-03-01
Rated 5 out of 5 by from Must-Have for some routes I didn't have a 4" cam and on my last trip to the Black Hills, I got shut out of two awesome routes for lack of that big boy. Not gonna happen next time. No, I haven't had opportunity to use the 4" yet, but the rest of my rack - all the BD C3 and C4s from 00 to 3" - has gotten lots of use, and I have no complaints. Rock solid. And nice looking as bling, too.
Date published: 2014-09-23
Rated 5 out of 5 by from Simply the best cam on the market There is nothing better to ease your fears than knowing the piece below you is a well placed Camalot. The C4's new trigger design works great with gloves, has a solid smooth action and the thumb loop is very secure. The double axle design offers unrivaled weight to expansion range ratios. Nothing else inspires more confidence and when on the sharp end that is an important attribute. Sizes .5-3 are the workhorses of any modern rack. Any smaller than the .5 and I would rather use a Metolius TCU.
Date published: 2008-12-17
Rated 5 out of 5 by from Plug and go, the standard Beautiful piece of climbing equipment, just wish they were cheaper but I feel they are the best. You won't be happy if you don't get the C4's. Don't try convincing yourself that the cheaper ones are almost as good.
Date published: 2007-09-04
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When buying as a gift the C4 Camalot; which size is the best all-around unit to purchase??

Asked by: Davey66
There are too many variables that play into which size cam is the best overall. If you are unsure which to purchase for a gift, we recommend a gift card so the climber can select the best size to fill their rack.
Answered by: REIservice
Date published: 2017-03-02
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