Clutch pipe union size

[JJREED]

Does anyone know what size the clutch pipe union on the the master cylinder end is. I've bought a number of sizer, 12mm, 13mm, 14mm, 7/16, 9/16. All too big or too small.
It might be a straight forward 1/2 but I'd have thought 13mm close enough, and it' isn't.

[caduceus]

3/16 MALE NUT 7/16 x 24

This is what's on my Pirtek invoice, along with the 1/4" kunifer pipe. Which one goes to the cylinder and which one goes to the ally block is anyone's guess.
Hope that's of help.

[ianwayne]

Seeing as it is the hydraulic system, perhaps it is British Standard Pipe thread?

https://en.wikipedia.org/wiki/British_Standard_Pip...

[phillpot]

caduceus said:

3/16 MALE NUT 7/16 x 24

So the 7/162 x 24tpi is the thread size but if the 3/16" is the diameter or bore or the hole how did they fit 1/4" pipe?

[keith-vznby]

If I remember correctly the alloy block end is male 7/16 the pipe is 1/4 the clutch end is 7/16 male.I put a clutch servo in and had to get male female adadptors for the fittings on the servo

[JJREED]

The pipe union 'spanner size' on the master cylinder end is 1/2" if anyone needs to know.