sleeve/shield anchors
Robert
Screwfix sell some sleeve anchors and some shield anchors. They look
very similar to me. Is there a difference between them?
SF also sell expansion plugs, which look like a sleeve anchor without
the nut. Is that what they are? Can you use any bolt in them or is
there a rule about the maximum length? I see that the anchors state
the maximum width of the fitting that can be secured.
There are also thru bolts which look like a similar thing. All these
different fixings. Is there a web site that explains them all? My head
aches!
Jón Fairbairn
> Hello,
>
> Screwfix sell some sleeve anchors and some shield anchors. They look
> very similar to me. Is there a difference between them?
Sleeve anchors are (I think) a metal tube that is bent open
by a cone being pulled in when the screw is tightened. I
think that's a one-off process, so you can't really re-use
them.
Shield anchors have separate parts that are pushed apart by
the cone, which means that if you loosen the screw you can
wiggle them out and re-use them.
> SF also sell expansion plugs, which look like a sleeve anchor without
> the nut.
Without the screw, certainly -- they look like sleeve
anchors, ie metal that bends.
> There are also thru bolts which look like a similar thing.
I'm not sure which type of expansion these have, but I think
these do have nuts on a threaded stud that pulls the cone,
rather than screws going into an expanding nut.
--
Jón Fairbairn Jon.Fa...@cl.cam.ac.uk
http://www.chaos.org.uk/~jf/Stuff-I-dont-want.html (updated 2010-08-11)
Andy Dingley
> Screwfix sell some sleeve anchors and some shield anchors. They look
> very similar to me. Is there a difference between them?
Generally they difference is that a shield anchor is the classic
Rawlbolt, with a number of rigid, hinged shields. Sleeve anchors use
a flexible tube instead. Both are expanded when an internal wedge is
tightened.
The difference is mostly one of size - big ones are shields, small
ones are sleeves. Where there's an overlap in the middle, a shield
works well when a strong, rigid wall can accept the load from a small
number of contact points. A sleeve gives a more conformal fit, so
doesn't overload the wall at points - shields are more likely to give
problems with cracking or crumbling their support point.
You can also remove shields by unbolting with fairly good success, but
not sleeves.
The Medway Handyman
> On 2010-09-08, Robert <rob...@locumpoint.com> wrote:
>> Hello,
>>
>> Screwfix sell some sleeve anchors and some shield anchors. They look
>> very similar to me. Is there a difference between them?
>
> Sleeve anchors are (I think) a metal tube that is bent open
> by a cone being pulled in when the screw is tightened. I
> think that's a one-off process, so you can't really re-use
> them.
>
> Shield anchors have separate parts that are pushed apart by
> the cone, which means that if you loosen the screw you can
> wiggle them out and re-use them.
Wot John said was absolutely spot on, but its worth mentioning the multi
monti http://www.screwfix.com/cats/101217/Fixings/Multi-Monti
or thunderbolt
http://www.toolstation.com/shop/Screws+Fixings/Steel+Anchors/d90/sd2040
The multi monti blurb reads;
Versatile alternative to the traditional shield anchor. Fast and easy to
use, it's very popular in Europe. Great in cracked and uncracked concrete,
F120 fire protection concrete, sand lime brick and solid brick. Its no
expansion effect makes tight spacing close to the edge possible!
High Quality Carbon Steel
No Plugs Required
Easy Driving - No Special Application Tools Required
Suitable for Light, Medium & Heavy Loads
Specially Designed Cutting Teeth Reduce Required Driving Force
Reusable & Long Lasting for Exterior Applications
Basically you drill a hole (smaller than for a sleeve/shield anchor) & drive
them in with a drill or impact driver.
Much faster to install, incredibly strong fix.
The SF ones are in larger packs (50 or 100) but available in more styles
e.g. CS, Torx & hex. The TS ones are only hex head, but you can buy packs
of 10.
--
Dave - The Medway Handyman
www.medwayhandyman.co.uk
Robert
<davi...@no-spam-blueyonder.co.uk> wrote:
>Wot John said was absolutely spot on1
I was meaning to thank John for his post, sorry I haven't done so
sooner.
> its worth mentioning the multi monti or thunderbolt
...
>Basically you drill a hole (smaller than for a sleeve/shield anchor) & drive
>them in with a drill or impact driver.
>
>Much faster to install, incredibly strong fix.
They sound very interesting. I like that they are removable. I have
just discovered that a set of shelves was held up by some thrubolts
and now I had got the headache of removing them (another thread).
These sound like a good idea. Is there a minimum distance that they
have to fit into the wall and is there a maximum thickness of fixing
that they will hold?
What I don't understand is how can they be repeatedly inserted and
removed from the same hole? Doesn't the concrete/brick eventually get
worn away, making the hole bigger?
Thank you
Rob