What do you hang on 1/4" bolts while rock climbing?
So 1/4" bolts, although not suitable for free climbing protection, are apparently still used for aid climbing to hold body weight, and for alpine rappels.
What I want to know is, what do you use for hangers on them? From what I can tell no one makes 1/4" hangers for aid bolts, do you just string them with a rivet hanger (which are twice as expensive as bolt hangers), or do you just use the 3/8" hangers? Is there something else out there that's made to be used as a hanger for a 1/4" bolt?
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Finding quality 1/4" hangers has been problematic for a long time. There was a thread on the topic on Super Topo back in 2009. The best solution back then were the Moses hangers (Moses actually posted in the linked Super Topo thread). I cannot find the Moses Enterprises web page so they might be out of business, but it appears you can still get the hangers online (e.g., from Mountain Tools and possibly others). They cost about twice as much as typical bolt hangers, but in my opinion are better than rivet hangers if you are planning on leaving them behind.
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I do not know a definitive answer to this question, but as there is no other reply so far I will share what I know:
When aiding in Yosemite a fellow climber used nuts for this purpose. You pull back the actual nut so that a wire loop extends behind it. This loop is places around the bolt shaft and can even be tightened. According to him this works fairly well. Still he highly dislikes routes based mainly on bolt aiding and thus only had to use it on certain sections. Due to the weight it is obviously not practicable to use nuts if bolts are your main means of ascent. I once used this solution while freeclimbing a slab that has been cleaned of the single bolt in the middle, but I luckily did not find out whether it would have caught me (to be honest, I was amazed it did not drop from rope drag).
One advice with very limited scope: In Yosemite there is apparently much innovation done in garages, you can find a variety of (sometimes not so) useful gear. There you can get such bolt hangers, but you are well advice to test them in advance. In a field test 2 out of 4 broke loaded with bodyweight.
In short:
I do not know a specific product, but you can use the wires on nuts for occasional use. Homemade solutions are in this case very possible but always dangerous as not normed and thus tested.
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