Originally Posted by Schalk79
Which o-rings work best for the Pin Lock posts?
I'm glad you asked. I've been meaning to post an update. I got my order of o-rings in a couple days ago and had ordered the slightly larger thickness for the pin lock post ring. I found that the slightly larger thickness
(0.139", p/n: AS568A-205) is actually too big to fit in the post groove! Because the ring thickness is a couple thous too large, the ring doesn't actually fit inside the groove, making it impossible to fit the QD onto the post. I'm curious to see if the ring with a slightly smaller ID (p/n: AS568A-204) would force the ring into the groove better, but I'm not going to be trying this in the near future.
At this time, I recommend going with the listed Post ring size for Pin Lock posts.
Post O-rings Buna-N $2.15/100 - 9452K23 (liquid post)
Post O-rings Silicone $10.71/100 - 9396K24 (gas post)