On 28 Jan, 12:38, Andy Hall wrote:
On 2008-01-28 11:37:51 +0000, sm_jamieson said:



On 28 Jan, 11:25, Andy Hall wrote:
On 2008-01-28 10:51:05 +0000, sm_jamieson said:

Am I correct in saying that the rawlbolt specification screwfix use is
( thread x maximum fixture size), e.g. M12 x 60 can fix 60mm thick
fixture. It looks like that from the pictures. The B&Q ones appear to
be (thread x length of bolt) and the back of the pack tells you the
fixture size - since the bolt is usually 50mm, in B&Q, M12 x 110 is
needed for a 60mm fixture.
Does this sound correct ?
(Good news: a local screwfix counter has just opened (Nuneaton))
Thanks,
Simon.

it's the fixture thickness in Rawlbolt specs.

If you are looking at these kind of fixings, then I've found that
injection fixings are a much better solution.

- There is not the issue of the fixing not gripping properly if the
hole is not quite right or the material a little crumbly

- You can have whatever length you like

- *Very* sturdy fitting.

I gues this is resin and threaded studs.

Exactly. Holes for these are always bolt size + 2mm and it's non
critical within reason.



Re screwfix rawlbolts, any guidelines to the size of hole used with a
certain thread i.e. is it always for example 4mm more than the thread,
so M12 would need a 16mm hole ?
Simon.

It varies. There are charts on the Rawlplug web site showing that for
Rawlbolts, the hole is 0.5 to 2mm more than bolt size. I found it to
be fairly critical which is one reason I don't use them any more.
Slightly too big and the fitting grip is weakened a lot.

Which resin studs do you use ?
Simon.