[guavatone]

I've got an old greenie and the same screws from that work in the Carnhill i got from the group buy.  The last number for the code is unclear but it's deff. marked St. Ives 10468

[SeventhCircle]

The new Carnhills are definitely #4-48.  They're not too hard to find, in the Bay Area a good source is Olander in Sunnyvale.  Not positive about the original Marinair spec, but M2.5 fine pitch seem to work fine.  You won't get a #4-48 into one of the old Marinair holes.

[guavatone]

Mine may have been butchered or um, re-tapped.  I doubt someone would tap a 4-48 thread though.

[rascalseven]

I don't know what the proper screw size is, though I've been told it is an obsolete British standard that is difficult to source.  It is VERY close to a 4-40, however, so I bought a 4-40 tap and just re-tap them for my builds.

I've had no problems with this... works great.

JC

[madriaanse]

Damn...  2 pages about a thread size! :shock: The official thread size is: 6BA Imperial - from the mouth of Carnhill.

M.

[tommypiper]

Thanks, Martin.  I believe 6BA is correct.  Geoff Tanner told me something like that once.  The BA stands for British Ass. Standard... or along those lines.  :grin:

Yes, the original thread is obsolete!  Let's agree on that.  

Weird that Carnhill switched to #4-48 threading...
and weird that some people say the #4-48 works in old original iron but Tim says it doesn't.  Can someone test it please?  Why would Carnhill switch to #4-48...?

Never heard M2.5 might work, thanks, Tim.

Otherwise we can always do what JC does and tap 4-40...

Whew.

[madriaanse]

Hi Todd,

I'm not sure Carnhill ever switched to 4-48, but have a look at the specs for 4-48 and 6BA:

6BA major diameter 0.1102", pitch 47.9 tpi
4-48 major diameter 0.1120", pitch 48 tpi

perhaps this explains why they're pretty much compatible.

(are we at 3 pages yet?  :grin: )

Take care,

M.

[guavatone]

.  The BA stands for British Ass. Standard...

...as in what British ASS thought of this as a standard....

-sounds about right :green:

[CJ]

http://en.wikipedia.org/wiki/British_Standard_Whitworth

[tommypiper]

.  The BA stands for British Ass. Standard...

...as in what British ASS thought of this as a standard....

-sounds about right :green:

Exactly.  :grin:  Just what I was hinting at... Of course CJ provided the answer. 'Twas Mr Whitworth...

Here's actually the link to the BA threads. http://en.wikipedia.org/wiki/British_Association_screw_threads

[tomelectro]

Intresting stuff - thanks!  I've used 4-48 on vintage Neve front panels as well, but I bet they were also 6BA to begin with.

EDIT: oops - looks like I've bumped it into a 3-page thread   :grin:

[guavatone]

woo whooo! 3 pages of a thread on threds!

I think tom deserves a prize....
...of course it would be a long screw :green:

[HappyTom]

come on guys!
3:rd page and noone ever searched for "6ba" at RS Components?

HT

[tommypiper]

It's not practical to buy from RS in the states.  I think most of us never look for anything at RS.  Those in Europe do, but you can already get BA screws via the UK anyway.

[BladeSG]

Anyone try a 2.5mm drill bit and a M3 taper tip tap on these?

[BladeSG]

Anyone try a 2.5mm drill bit and a M3 taper tip tap on these?

I just did it without the drill bit (too worried about the softness of brass)..... worked like a new one  :thumb:

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