Camlock o-ring replacement (and food safety)

[stephelton]

I've accumulated a few different variations of camlocks over the years, and unfortunately some are more difficult to lock than others. After some experimenting, the o-ring seems to be the cause..

So I figure my obvious solutions are (1) use a slightly smaller/thinner o-ring, or (2) use a softer o-ring.

The second option is probably preferred. I'm currently using buna-n o-rings (I'm pretty sure...) and they are indeed quite hard. I found these on mcmaster:

http://www.mcmaster.com/#2418t166/=s3yrvz

They are durometer hardness of A50, which would probably solve my problem. However, they don't say anything about food safety. Should I be concerned?

And for that matter, does anyone have any other recommendations? I'll probably be replacing many of these, so I need a reasonable price...

 

[BargainFittings]

If you go with buna-n they have fda rated ones but they are A70 hardnes.

http://www.mcmaster.com/#9555k32/=s5c0o9

I personally have used the 211 silicone o-rings in some stiff camlocks and they locked easier.
The silicone o-rings are A70 hardness.

How stiff are the problem camlocks?