What are these bolts and how do I use them?

Foresty Forest · 19 Jun 2020

I bought a couple of wall brackets for holding my ladders. The brackets arrived with these bolts, and I haven't got a clue what they are and how to use them? Help please?

Thanks

Burnerman · 19 Jun 2020

If you have a look at 'drop in anchors' you'll get the drift.......great in hard concrete.
John

Foresty Forest · 19 Jun 2020

Burnerman said:
If you have a look at 'drop in anchors' you'll get the drift.......great in hard concrete.
John

Thanks. I don't have a setting tool. Can I improvise with something else? A punch maybe?

Burnerman · 19 Jun 2020

These fixings need a precise hole which has been cleaned out to make them work every time......I have had success with a parallel punch of my own when I was fixing down machinery.
In your situation, maybe 8mm plugs or whatever could be satisfactory?
John

Diver Fred · 19 Jun 2020

Foresty Forest said:
Thanks. I don't have a setting tool. Can I improvise with something else? A punch maybe?

Yes - a punch is OK.

conny · 19 Jun 2020

The only way I can see a punch be useful for these is to tap them into a precise hole to the correct depth without damaging the thread walls.

rsgaz · 20 Jun 2020

I still don't see how these are going to work with a bolt. The bolt will just botom out on the wedge.

They are used for hanging threaded rod from a concrete ceiling, not for bolts.

HERTS P&D · 20 Jun 2020

You need the punch that goes with your bolts.

Andy

JohnD · 20 Jun 2020

Foresty Forest said:
I bought a couple of wall brackets for holding my ladders.

What is the wall made of, where you want to attach the brackets? Will they be prone to theft? Or fat builders climbing on them?

The might not be the appropriate fixing.

Burnerman · 20 Jun 2020

The drop in anchor isn't parallel threaded all through its length - the bottom diameter is much smaller so when you drop a punch in and belt it one, the bottom diameter wedges out and grips in the hole. Therefore these fixings can't be retrieved once in.
Great for hard concrete once the (correct size) hole has been blown out and the drilled depth is critical for success. Good though these things are, they aren't forgiving so another type of fixing - post #4 - may be better in this situation.
John

Foresty Forest · 20 Jun 2020

I think I'm just going to use a couple of screws. It's just ladders.

rsgaz · 20 Jun 2020

Burnerman said:
the bottom diameter is much smaller so when you drop a punch in and belt it one, the bottom diameter wedges out and grips in the hole.

John,

You make it sound as though with the ones you've used, the bolt can 'pass through', much like a rivnut. Is that what you mean?

I've never seen that type. I just dug these M10 ones out my van, you can't see through them, there is a conical wedge, which does the forcing outward of the 4 prongs. So, in the OP's original picture, those really long bolts will just hit the wedge and not go any further!

And a little blue circle of plastic to stop the wedge falling out in the box, which I've never noticed before!!

Burnerman · 20 Jun 2020

I think the OP’s inserts are set with a parallel punch, which spreads the bottom bit out.....these allow the bolt to pass right through - although if the bolt was too long it would bottom out and attempt to force the insert back out again. I’ve never tried those though!
The ones I used had a conical tapered insert which was dropped into the fixing once the hole was drilled and cleaned - we aimed to get it around 5mm below the floor surface. In with the punch to spread the end, leaving the tapered insert in place. It was important to cut the bolts to the correct length, which was 2/3rds the depth of the insert. These things were great to hold lathes in place but of course they couldn’t be shifted afterwards.
Personally I’ve only ever used these things in a floor, but a concrete ceiling would suit them well enough I guess.
John

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What are these bolts and how do I use them?

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