Through bolt questions on usage

Robbox · 26 Dec 2020

I have a few M10 x 120mm through bolts and want to use them on an internal wall constructed from 3" concrete clockwork + plaster.
My understanding is that the 'collar' needs to be of sufficient depth into the wall to get the best purchase.
On the box it says 60mm depth. So my concern is that since the blockwork + plaster is ~95mm that the expanding section could be to close to the back of the block and break a section off?
I'm fixing stud timber to this wall as in two "gallows" brackets to support a heavy desk.
Is there a better shield anchor type that would work better with stud timber to wall?

Deleted member 174758 · 26 Dec 2020

Have you looked at resin anchors instead? With them you can cut the stud to any required length. There are resin systems which can be used with standard (albeit heavy duty) caulking guns

Robbox · 26 Dec 2020

I did think about the resin system, but didn't want the extra expense for just a few holes.
I've looked around but haven't found a Rawlbolt type that can take a stud timber between bolt head and wall. Maybe the way is to buy the regular Rawlbolts and replace the bolt with a longer one to accommodate the stud timber.

ETAF · 26 Dec 2020

but didn't want the extra expense for just a few holes.

I have used this to hold up Posts for Gates , not that expensive
https://www.screwfix.com/p/easyfix-kem-psc-175-ef-chemical-resin-175ml/5650j

Deleted member 174758 · 26 Dec 2020

Robbox said:
I did think about the resin system, but didn't want the extra expense for just a few holes.

As said a basic resin such as Easyfix KEM-PSC-175-EF from Screwfix is about £6. You can use standard galv. steel threaded rod, cut to length, with nuts and washers, if you don't want to buy the purpose made studs (M12 x 160 resin anchors are circa £12/10). Either way you will still need something like an SDS drill and appropriate drill bit to produce the holes (14mm for M12 stud resin anchors), so no extra cost there. And you will need a caulking gun. So TBH I don't see that much difference in price between the two systems but a major plus of resin into ropey brick over shield anchors (Rawl bolts) is that resin won't cause the masonry to crack whilst shield anchors can do just that

JaimieH · 27 Dec 2020

Concrete bolts are another option to consider. Easy removal at a later date is one advantage of these.

Robbox · 7 Jan 2021

Thank you for all your replies. I ended up with Toolstation concrete through bolts. In the end very easy to install, I already had the right size SDS bit, put in three and the post is super solid.

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Through bolt questions on usage

Robbox

Deleted member 174758

Robbox

ETAF

Deleted member 174758

JaimieH

Robbox

DIYnot Local

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