March 1Mar 1 I need to bolt down a post and also 2 rollers being running gear for a cantilevered gate. what are the best bolts/fixings to use? thanks
March 1Mar 1 25 minutes ago, Iceverge said: Chemical anchor and threaded rod. +1 Ensure stud, washers and nuts are corrosion resistant (stainless or galv). Clean the drilled holes thoroughly.
March 1Mar 1 I'd cast in J bolts for that as a "holding down unit". Hooked round mesh going down into the concrete. Don't get me wrong I love chemical anchors.
March 1Mar 1 Your gate kit should have them included or at least the spec. Mine required 12mm SS rods cast into the concrete. Think they had to be 250mm long, 50mm proud, 200mm set in. A rather large sliding gate tho.
March 1Mar 1 I also really like chemical anchors! 🥰 I'm almost disappointed I don't have more stuff to bolt down with it. It's a hard life post-build... When you run out of fun stuff to sink your teeth into...
March 2Mar 2 Again, J bolts hooked under reinforcing mesh or some similar design of holding down unit with plates and long studs. Windage against a gate and offset loads will just worry chemical anchors out over time. With something locked into the concrete you're trying to "worry" the whole, large concrete footing.
March 2Mar 2 4 hours ago, Onoff said: Windage against a gate and offset loads will just worry chemical anchors out over time but the sheep can escape the worrier.
March 2Mar 2 Author Hi @Onoff @Conor too late now for the J bolts....the pad was placed ages ago. In any event here is the manual for the gate - it shows preparation for the fixings happening after the pad has gone in. No info on the diameter of bolt etc needed.
March 2Mar 2 Measure the holes in the rollers. Your stud should be snug but not tight. It is probably M12.
March 2Mar 2 58 minutes ago, markharro said: Hi @Onoff @Conor too late now for the J bolts....the pad was placed ages ago. In any event here is the manual for the gate - it shows preparation for the fixings happening after the pad has gone in. No info on the diameter of bolt etc needed. Look just like my rollers. 12mm resin anchors will be what you want.
March 2Mar 2 Author Thanks. I actually have a bit of 16mm threaded rod and it fits but maybe I want more wriggle room that I would get with 12mm to make sure I get both rollers in line? There is no guidance of the length of rod to bury in the concrete however? Also can anyone recommend a particular brand of resin? Do I need one of the tools shown to blown out the drill dust or will a vacuum do that?
March 2Mar 2 Use the fattest stud that will fit through the holes. Use the plate as a template. 100mm depth in the concrete should be fine and 2mm bigger diameter than the studs. Either a blow out tool or a hose to clean the holes.
March 2Mar 2 You need a fair bit of wiggle room in order to get everything lined up. And once you cast the bolts, you can't redo it. I used rawlplug resin. Edited March 2Mar 2 by Conor
March 4Mar 4 Author Very helpful replies thanks and think I know what I'm doing now. One more question however. An engineer pal has said to watch out for galling between stainless steel threads and nuts. For this static application can I use standard grease for this or something more specialist?
March 4Mar 4 41 minutes ago, markharro said: Very helpful replies thanks and think I know what I'm doing now. One more question however. An engineer pal has said to watch out for galling between stainless steel threads and nuts. For this static application can I use standard grease for this or something more specialist? Absolutely. Galling is a thing to be very wary of. Use copper slip or aluminium anti seize. A bitch if they gall. Another trick is to use A4 nuts on A2 studs as well as an anti seize medium.
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