Hi, i want to fix an arial to a wall. it comes with a metal bracket through
which to use screws to put into plastic rawlplugs in the wall.
since i will need to take it down again in a few years; which screws should
i use that are least likely to rust? here in london u.k. i have only ever
seen 'brass' screws in the old style tapered shape with the single slot,
which i dont think are suitable.
so would you please advise a novice which of the modern non tapered screws
are easiest to get out in a few years please? (i.e. heads have not rusted
the mechanical style (in the USA) is called sheet metal screws. They have a
coarse thread similar to a wood screw, but have no taper, except right at
the point. The drive comes in both slotted and Phillips.
Stainless steel will never rust but they are softer than galvanized and
easier to strip if using a phillips head . Brass will work. For 3 years or
less I would use plain old galvanized hex head with attached washer. Those
may not be available in UK but I bet a pan head galvanized sheet metal screw
The size of the screw would be based on the weight it needs to support and
the size of the mounting holes. Also are you attaching to brick? Or what
> "jw 1111" snipped-for-privacy@REMOOVEvirgin.net wrote in message
I question that stainless steel is "softer" than galvanised steel,
would agree that it is less pliable and resilient. Brass is
much softer and
comparatively weak and can easily snap with
over-tightening. It is also
expensive. You also run the risk of
bi-metallic corrosion as it is a fine
conductor. (Jobs that you thought
were temporary have a nasty habit of becoming
girlfriends) I usually use Allen Key heads - but a Phillips in
stainless and correct screwdriver bit you needs be a mighty strong guy
damage the head seriously. It is another matter with the screws used
proprietary plastic-plug fixings.
This may something for the quality of Wurth's products. Not cheap !
We have used hundreds and hundreds of such stainless steel bolts and
had damage. if they are taken out they go back in the box
for re-use. For
fixings that require a long throw from the wall such as
pipes that are bent
around a corner, I use cut lengths of 8mm stainess
threaded rod. Put a dome nut
on the end and and with a hex bit on your
cordless you can drive them in. For
added strength I put a stainless
penny-washer and a nut tightened to the wall.
I did omit one important particular in my first description of this
system - The
bolt should only go about 15mm 3/8 inch past the point at
which the plastic plug
begins to split. If the bolts are too long they
will mangle the plug.
And again the hole in the masonary much be exact.
I have never tested such a fixing to destruction but I do have some
static loads hanging off two fixings only.
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