pneumatician - 26-2-2017 at 21:52
Hi, someone have at hand the history of this joint ball joint size?
I only find, in a fast search, clamps but not any glass joint male (ball) or female (cup).
TIA,
pneumatician 
Chemetix - 27-2-2017 at 01:47
What sort of information are you after? Original manufacture by who and when sort of information, or a particular manufacturer and a particular design
by them sort of thing?
Your question is a bit open ended?
pneumatician - 27-2-2017 at 15:01
where I can buy one male cup 40/41.
many sellers have 40/25, but I think is not a new denomination, right?
perhaps this is from Germany, old DDR, not used by any other country? and now a discontinued product?
Chemetix - 27-2-2017 at 15:39
Cup is the female part, ball is the male; 40/41 sounds like an inch range ball joint which is made to DIN 12244 and ISO 641 standards. Where the ball
has a ground diameter
of 37.8mm and a spherical diameter of 38.1mm. It's still called a S40 fitting.
The next size up is a S41, the ball has a ground diameter of 40.95mm and the spherical diameter is 41.275mm.
My supplier is German manufactured.