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As title really. Have you reused them and not died yet?
I always reuse my 10sp links. Never had a problem.
I've reused both Shimano and SRAM quicklinks without issue, however I have also seen the captive pins loosen and fall out.. presumably from repeated reuse. So, yes.. to a point.
I've also broken and joined Shimano chains without using the snap off pin. I've been doing this for many years as I had no idea till recently that thats not the way to do it!
I wouldn't think twice about reusing a quicklick (or using multiple quicklinks in a chain).
I've broken 11spd chains where I've rejoined and broken a reused quick link (one that said single use). However KMC now offer a multiuse 11spd quick link. Will be using those from now on.
within reason yes
I didn't even know Shimano made a Quicklink!!
Officially no, but practically yes, multiple re use has seen them fail when removed in my experience.