[sdiy] 4-40 screws?

[Magnus Danielson]

From: "JH." <jhaible at debitel.net>
Subject: Re: [sdiy] 4-40 screws?
Date: Fri, 7 Jan 2005 02:28:05 +0100
Message-ID: <001b01c4f458$250e4c90$0200a8c0 at jhsilent>

> 
> > Trade you for some 2BA screws for mellotron tape frames!!!
> > 
> > ok just kidding, well almost kidding, I do need some eventually...
> 
> I'm afraid I don't even know what 2BA means (no kiddig!).
> 
> 
> > 4-40 by what? (in inches, of course)
> 
> I'm not so sure about inches. The thread is approx 3mm in diameter -
> that doesn't fit with 4 * 10**N in inches, does it?
> I thought you have somthing like a "number 4" type screws over there,
> don't you ?

I haven't the faintest about these standards, I known what M3x10 means
(10 mm long M3 screw, 3 mm in diameter) and other M-type of screws. I've used
M3, M4 and M5 in my latest project this summer. That is known sizes for me.

2BA... what-the-f**k is it?

Could somebody explain... and better up, explain why not the propper M-screws
isn't used?

Cheers,
Magnus - from a metric country