Metric sizes in machine screws and bolts. M7 seems very rare.

A few on Ebay, though whether the pitch of the Thread is the same...

Seems M7 is used in split rim wheels, didn't know that ;)

Sorry, scratch that, not in countersunk style there isn't :(

Bolts though :)

If they are holes, it doesn't really matter what screw you put through them. 1/4" is 6.35, they should work.

If they are threaded, then the internal diameter of 6.93 suggests (a loose but tolerable fit for) 8mmx1.

M7 is going to be difficult to find. But M6 will be more than up to the job. CSK SS with an allen socket may look the best.

For once she's right. Any woodscrew upto 6.9mm dia should fit.

NT

Thanks - not threaded just a metal plate with counter sunk holes for bolts or screws.

Cheers

Dave R

Ta.

There seem to be plenty of M6 so I will go for some of those.

Still not sure why nobody seems to use M7.

Cheers

Dave R

then I don't understand why you'd want M7. Something's not right with this picture.

NT

Use M6. It's a telly not the QE2.

Bill

There's no demand for it because it isn't available. It isn't available because there's no demand for it.

Bill

It is quite popular in the motor trade M7 x 1.0 (same pitch as M6) I got asked to make quite few car bits over the years and so bought a set of taps and a split die for M7 (Iso-coarse).

Hex head is normally M11 for these.

The important thing is how they sit in the countersink.

Use two M3.5 electrical screws? ;-)

They are clearance holes for m6 screws or 1/4 screws

I measured the hole to see what the size of bolt would be to match.

The dimensions suggest that you can fit an M7 bolt through the hole.

Biggest is usually best, especially when fixing heavy stuff with leverage (bracket folds out from wall).

So I was opting for the chunkiest bolts I could fit through the hole.

Cheers

Dave R

The bracket is built like the QE2.

My main concern is the leverage when the bracket is fully extended with a TV on the end. It folds out quite a long way.

Cheers

Dave R

Yes but these brackets are usually fixed to a masonry wall. This implies wall plugs of some sort, and you can't fit these with perfect accuracy. So having holes in the bracket which are slightly oversize to the screws you use makes life very much easier. In any case, if fitted correctly what stops the bracket moving around is not the lack of diametral clearance between the bracket and the screws, but the friction between the back of the bracket and the wall. You get the friction from the tension in the screws. The bracket may be "resting" on one or two of the screws, it's not likely to be resting on all of them (unless they are countersunk).

ICBA to do the sums at the moment, but the shear strength of a single M6 bolt is something like a ton.

It is almost certainly designed for wall mounting using screws and wall plugs. With these, the larger the better. So the plug doesn't pull out of the bricks. But the chances of shearing an M6 nut and bolt, remote. The fixing of the bracket to the 24" TV back here is 4 x M4.

I'd say your main problem in a caravan is finding something strong enough to fix the bracket to - rather than the strength of the bolts.

It's also a 7 mm af Allen key, isn't it? I recall having to buy one for some VW brake callipers, iirc.