[davej]

Thinking of using 12mm x 10mm long stainless steel through bolts to equip a couple of new routes on limestone. Does that size bolt sound ok?

[guypercival]

I would say so. This standard was used in the extensive Cheddar restoration in 2004 and they have lasted very well indeed. The lower offs are the fixe hangers with the chunky rings. Because they can spin on the hanger they never seem to wear.

[danm]

10mm is a bit short  100mm is decent

Not all bolts are equal, make sure they're certified or if not that you know what specs to go for. If the crag is coastal or the rock is soft/crappy, don't fanny around get some glue-ins. PM me if you want to know any more, I've run about 6 bolting workshops now and am happy to run more/help advise people.

[davej]

 Yes 100mm long! Hi would be keen to come on the next bolting workshop you run damn Thanks for the advice guys