[T3] Common Hardware Sizes and BelMetric

[Dave Hall]

Adriel, I don't mean to mislead you.  It's probably what they call coarse
that's usually needed.  I call it standard, which depends on the bolt
diameter but I've not been looking in a catalogue.  Fine is used
occasionally, the 'other' is the normal one.  

Looking on Wiki athttp://en.wikipedia.org/wiki/ISO_metric_screw_thread it's
not as clear.  The safest thing is to measure the threads per inch (tpi) to
be sure.  I see there are various alternatives.  Looks like I've got to mug
up on this.  I know the CHT tapping is 1mm pitch, and that was called fine.
I see the list gives 1mm or .75mm for fine!  I thought metric was standard -
obviously not.


Dave
UK VW Type 3&4 Club
===================


-----Original Message-----
From: type3-vwtype3.org [mailto:type3-vwtype3.org-bounces at lists.vwtype3.org]
On Behalf Of Adriel Rowley
Sent: 22 October 2014 04:35
To: type3 at vwtype3.org
Subject: Re: [T3] Common Hardware Sizes and BelMetric




----------------------------------------
> From: dave at hallvw.clara.co.uk
> To: type3 at vwtype3.org
> Date: Tue, 21 Oct 2014 11:32:16 +0100
> Subject: Re: [T3] Common Hardware Sizes and BelMetric
>
> I don't have any experience with Belmetric, but most stuff in the UK 
> is now metric. Trouble is there is such a big range of screws and 
> bolts used that unless you're going to get longer ones and cut them 
> down as necessary, you would need a large selection. Also there's the 
> need for high-tensile ones for certain applications, and occasionally
metric fine rather than standard.
> I don't think much uses metric coarse.
>
Good point and good to know course isn't used. Many bolts only come in
course and fine, no third, so it seems.

> From the parts book, the list of standard hardware contains over 50 
> different bolt sizes and a similar number of machine screws. I don't 
> think it would be economical to buy much of the range. If you plan 
> engine work some of the M6 x 10 cheese head screws might come in handy 
> for the tinware
> - they often chew up - but some of them are M6 x 12, so you see the
problem!
> Those are best changed for hex head to make removal easier later. Buy 
> some
> M6 x 12 hex head and a bag of washers to allow for holes tapped into 
> castings!
>
At some point like to rebuild another engine, but no time soon! Good point,
as the spare set of tin doesn't have screws. Good point about washers! That
be much easier to have on hand, and in a pinch, stack a few and get by with
a longer bolt.

> M8 x 20 is a useful size too, but there are so many variations. By the 
> time you get to your 60's, there are part bags of all sorts of 
> fasteners, so you can spend hours sorting them out by gauge, length 
> and thread! I am doing that with BSF, BSW, AF, BA, and Metric at an 
> aircaft museum, and I am not really much the wiser about which is 
> which - at least with metric there's not the range of choice!
>
The Volkswagen are mostly in one of those boxes with individual
compartments. Need to get another for the Mercedes. Nice thing about metric
is the grade is clearly stamped on the head, rather than some code you have
to look up! 

I can't believe there is that many types of hardware! :O My Dad is helping
build a Naval WW1 replica with other museum volunteers; name escapes me, but
Boeing only build a few for the Navy before the war ended, sold a fellow the
bits left, prior owner attempted to finish, then went to the museum. The
issue is not a lot of plans, stuff was already build but not correct, and a
lot of rebuilding and guessing. So what is it with these museums and the
plethora of work to be done? l.o.l.

> If you can get dished washers in M6 and M8, they are often found 
> broken when something is unbolted. Some use the split ring locking 
> washers, which are often found broken.
>
Good point! Why use one over the other?


Thank you so very much!
Adriel



-------------------------

1971 Sunroof Squareback with F.I. - In the Process of Being Dog Wgn 2
1985 Mercedes-Benz 300TD-T - Dog Wgn
Master's Student, A.S.U., living in north central Mesa, AZ
 		 	   		  
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