21 May
2011
21 May
'11
11:19 a.m.
On 2011-05-21 19:00, Tony Duell wrote:
I am repariign an old French office telephone at the
moment, It is
missing a number of screws, whih looked to me M3. I
therefore
(incorrectly) assmed there'd be no problem replacing them.
Alas they are not standard M3. After measuring up some of the exisitng
screws, they appear to be 3mm in diamter, 0.6mm pitch (standard M3 is
0,5mm pitch). A look in a 1943 Machinery's Handbook suggests this is a
French metric thread.
It is a French telephone after all ;-)
Some quick Googling on French sites tells me that this is an old standard
("S.I.") which does not seem to be used any longer, not even in France.
This is a table of those threads:http://www.cijoint.fr/cj200809/cijkUPkub5.jpg
They do not seem to be easily obtainable, not even in France. You will probably have to
make them yourself, unfortunately.
/Jonas