Concrete fixing screws.

[Archibald Tarquin Blenkinsopp]

Hi I bought some "Thunderbolt" M8 Torx concrete fixing screws. These are to upgrade from plastic plugs. I am hoping to get a considerable increase in strength of fixing.

What do I use to fit them. Currently I have nothing to do a trial on, but the suggestion that an impact driver is needed seems a little odd. I would have assumed that the impact would just shear the newly cut concrete thread.

Is a normal screwdriver practical, I notice Lidl have a pneumatic impact driver on sale currently, would it be worth getting one?

Regards

AB

[GB]

I have done them up with a socket set.

[Archibald Tarquin Blenkinsopp]

Thanks, I'll give it a go.

I bought a lot of the Torx bits, so I have a few spares if I chew them up.

Regards

AB

[newshound]

+1 (I have a 1/4 drive set which is usually ideal)

[nothanks]

plus another one. I used concrete bolts for the first time recently - very impressed. I used a 3/8 socket set though because quite a lot of torque is needed.

[Tricky Dicky]

I have driven 8mm Torx concrete screws in with an impact driver no problems . An impact driver works differently than a hammer drill, the impacts are i n the direction of rotation. Larger bolts I have used a 1/2" socket set. Yo u do need to clear as much dust out of the hole as it can make driving the bolts in hard.

Richard

[David]

IIRC I used an electric drill/driver to drive the screws into the concrete, then finished them off with a socket set.

This was before I had my Makita impact driver, which should be ideal for the job. Impact screwdrivers are a goodly thing. I bought one after watching our builders do virtually everything but stir their tea with theirs.

Cheers

Dave R

[newshound]

Oh yes, you need 3/8 for the multi monti type that have a 6mm core, but the ones about the size of a No. 12 screw will usually go in with a T bar on 1/4 drive.

You do need to have just the right size pilot hole, I find.

[newshound]

We've all stirred our paint with a combi drill, surely?