in this video we're going to take a look at the difference between a stainless
steel bolt and a steel bolt obviously these are set screws because
they are fully threaded but it doesn't matter if you are using set screws or
bolts the principle is exactly the same for most jobs on the site where I work
we actually prefer to use steel bolts they are a lot better although they do
corrode they are a lot easier to undo a lot of people are under the impression that
stainless steel bolts are better and that is not always the case
stainless steel bolts can actually suffer from something called galling so
if you put a nut on there and were to run it up and down there a few times and
a bit of friction was created there is every chance that the actual nut would
just seize onto the bolt and you will never be able to remove it without
slipping off all of these threads one of the machines on site that I work on
actually use stainless steel bolts and these are often tapped into stainless
steel holes the massive problem is that when you are turning them by undoing
them they can actually tighten up for no reason at all and when they go tight
there is every chance that you're gonna shear the head of the bolt or the set
screw so it is a major problem you cannot overcome it slightly by using a
anti-seize compound but in a lot of machines that I work on you can't actually
use anything like that because you can cause contamination so I'm now going to
put this set screw in the vise and then I'm going to use the stainless steel nylock
nut and I'm just gonna run that up and down the thread a couple of times
and already you'll see that that has galled you can hear the hammer on the impact
wrench and that has now galled up so that nut is now seized completely on to that
bolt I'll now swap that over for a steel set screw and this time I'm going
to use a steel nylock and this time you can run the nylock nut up and down the set screw
absolutely no problem at all
so steel on steel does not cause a problem whatsoever
and if you actually look at the threads on that you can see that they are
absolutely perfect whereas the stainless steel one has actually galled up and that
has actually seized onto the set screw so this absolutely no chance at all of
getting that off and using it on site we actually get some bolts which are
absolutely impossible to undo with a spanner, a ratchet an impact wrench or
anything the only way you can get them out is to burn them off with burning
gear a lot of people don't actually realize that you can't use burning gear
to cut off stainless steel nuts and bolts oxy-acetylene will not cut through
a stainless steel nut or bolt I'll now give you a demonstration of that first
of all I'm gonna burn off a mild steel nut and bolt
you can see that the burning gear cuts through that absolutely no problem at
all
now if we use the e burning gear on a stainless steel nut and bolt you can see
that absolutely nothing at all happens
you can make it glow red hot, but that's about the only thing you can do
when you press the lever for the oxygen nothing much happens so you've
got absolutely no chance at all of cutting off a stainless nut and bolt
using burning gear obviously there are places where you can only use stainless
steel bolts such as in marine environments etc but for the majority of
people that use mild steel bolts a stainless steel bolt isn't really a
suitable replacement because it can cause you a lot of problems
so if you're ever considering using a stainless steel nut and bolt instead
of mild steel nuts and bolts there are a few things for you to consider I hope
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