[modeleng] Re: Mystery thread

It could be a 5.5mm x 1mm pitch screw.

The easiest way out, may be to tap it to the next imperial or BA thread and 
use a matching grubscrew?

Cheers!   Hubert

----- Original Message ----- 
From: "Harry Wade" <hww@xxxxxxxx>
To: <modeleng@xxxxxxxxxxxxx>
Sent: Wednesday, November 21, 2007 3:41 AM
Subject: [modeleng] Mystery thread


>I am presently converting a 14" Rockwell wood bandsaw for metal cutting and 
>I need to match the thread of a grubscrew (missing) for a David Brown 
>reduction gearbox, which I assume was made in the UK.  The screw diameter 
>measures .216" and the pitch is between a 24 and 28tpi but it is neither a 
>24 nor 28.  The .216" is dead-on for a US #12 machine screw but it isn't 
>that.  Anyone have an idea what this thread might be?
> Regards,
> Harry
>
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