How to keep the man in Halfords amused for ages...

Some of the nuts on my various Hondas work best with an imperial
spanner. It may be a manufacturing tolerance with the nuts, or more
likely with my cheap spanners [1]

[1] But I have recently replaced the more common sizes with some top
of the Stanley range with the extra doo-hickey to make a good contact.

 

Champ says...

I used to own Minis, so I had a collection of AF, Metric and some
Whitworth.

 

That's sort of my point - if I need some imperial spanners, it means
my choice of vehicle(s) has taken a serious turn for the worse.

 

Some Saabs (well, some Saab 99s, at least) used a british engine, so
had mixed af and metric parts. Fucking nightmare to work on.

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`\|/`
`

 

Well, that's what it really is, but who knows what it's known as by the
non toolisti. 'Allen socket' describes it, even though it's not a
socket.

 

Yes, that's kind of strange. You'd think the plumbing threads would be
metric - surprised me to find that GoodOldBSP was in use in Metricland.

 

Various BA sizes made good approximations to metric sizes.
0BA, confusingly, is 1/4" diameter by 25.4 tpi -- i.e. exactly 1 mm pitch!
This made it a reasonable replacement for 6 mm. I think it was 2BA that
fitted a 4 mm thread as well, when I had nadgered fork-drain bolts once.

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KotPT -- "for stupidity above and beyond the call of duty".

 

Yeah they use inches

The Germans call it a "Zoll"

 

It's a good job you got out of engineering. 1/2" is about the only
size where UNC & BSW aren't close to being compatible.

 

I is confused. What does nut size have to do with thread type?

 

It's an old fashioned thing. Basically the Brits and the merkins both
had fine and coarse series threads and they had very similar pitches
but different flank angles. 1/2" UNC & 1/2" BSW had different pitches
as well as flank angles. Confused now?

 

So an 8mm nut is not one that measure 8mm between external edges (the
edges what the spanner gets hold of)?

 

Using the patented Mavis Beacon "Hunt&Peck" Technique, Champ

^major

--
Wicked Uncle Nigel - Manufacturer of the "Champion-105" range of rearsets
and Ducati Race Engineer.

WS* GHPOTHUF#24 APOSTLE#14 DLC#1 COFF#20 BOTAFOT#150 HYPO#0(KoTL) IbW#41
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Suzuki TS250 "The Africa Single" Yamaha GTS1000

 

I must have missed that week of metalwork class.

 

I thought I had it but now I have lost it again. What you say fits my
original understanding.

 

On Sat, 06 Aug 2005 15:59:19 -0000, "Simian"

That's all very good and informative but can we get back to BSW & BSF
then chuck in Imperial AF before too many people start to understand.

 

Oh, good. I think I am now ready to learn about the inportance of BSW
/ BSF and Imperial AF threads when buying a new set of Allan sockets.

 

Was that because they were left-handed?

 

Will we ever have an engineering Jurassic park or does it already
exist in WUN's garage?

 

**** off with the smileys. You're just trying to confuse the issue and
it's not funny.