Thread: 11mm nut no such thing

Originally Posted by .RC.

I tried to find M9 bolts to replace a broken head bolt on a Kubota engine...The bolt shop laughed at me...

Yet they had no problems whatsoever getting some 9/16 UNC high tensile bolts for the engine of a case tractor...

I laugh, ha ha ha.

None of you blokes own old D series Citroens.
Thread sizes are 5,7,9 AND 11mm
To complicate matters, up until 1967 the 5mm threads had a 0.75mm pitch, then went to the current ISO standard of 0.80mm pitch.
For yuks and grins, the old 7 x1mm had 12mm heads, the later ones 11mm heads.
5s were always 8mm heads no matter the pitch. When you mix them it's a bitch.

Being a sucker for punishment I have both a 1966 and a 1974.

Okay, now it's your turn, have a laugh.

cheers
Richard

Originally Posted by Pete F

*******
... oh no, it says that camera mounts are actually UNC not whitworth so that means we still don't have a winner

Sorry to drag this thread up to the top but if you look at the current DIN 4503 / ISO 1222 standards you will find that it is 1/4 & 3/8" UNC for new equipment manufacture.
Agreed you will find very little reference anywhere to this move to eliminate an 'internationally' awkward (55deg) thread.