[modeleng] Re: bolt head sizes

Hi John

It was the BSW hex sizes that were reduced during WWII.  Prior to that, they 
were 1/16" bigger than BSF - that is to say, for example, a 7/16" BSW bolt 
had the same size head as a 1/2" BSF.  If you see any spanners marked "BSW" 
they will fit the pre-war size, and any marked "BS" will fit both BSW 
post-war and BSF, as they are the same.

Regards
Ron

----- Original Message ----- 
From: <john.burridge@xxxxxxxxxx>
To: <modeleng@xxxxxxxxxxxxx>
Sent: Thursday, February 24, 2005 9:36 AM
Subject: [modeleng] Re: 12ba Screws



> Also i know that during the war bolt head sizes were reduced to save on 
> material did this happen across all British Standard bolts and threads.



-- 
No virus found in this outgoing message.
Checked by AVG Anti-Virus.
Version: 7.0.300 / Virus Database: 266.4.0 - Release Date: 22/02/2005

MODEL ENGINEERING DISCUSSION LIST.

To UNSUBSCRIBE from this list, send a blank email to, 
modeleng-request@xxxxxxxxxxxxx with the word "unsubscribe" in the subject line.

Other related posts: