Hello all, another quick question.
Does anyone know the thread pitch and length of the nc disc retaining csk screws, and how many per disc? It looks like m6x16 but doesn’t harm to ask. Saves me stripping down to find out. Much cheaper to grab a pack of ht screws and have some spare than buy from the suppliers.
Cheers
Dean.
You don’t ‘need’ them, the wheel will hold it all together.
The ND does not have any on the front or rear.
In fact it is useful to be able to unseat the disk every time you have the wheels off so making them more easily removed when the time comes to change them.
None on the front discs if my mark 3 either. I’ve done a few track days with no dramas.
I haven’t need to do any brake work on mine yet, but I don’t use the retaining screws with other cars either.
There are none on my stock discs actually now I’ve looked back at my pics, but the replacements come with the countersunk holes so I figured wouldn’t hurt to fit them, but if nobody else bothers I doubt it’s worth it for me then.
I’d just have preferred to have some in a drawer because whenever I’ve removed them in the past they’re fit for the bin by the time you get them off.
Cheers.
Im only replacing them because they’re so comparatively cheap. I got all four and pads for about the cost of a single disc on my previous car, plus they were pretty rusty as most I looked at where the cars sit about in winter.
When I did my front discs I remember what a PITA they were to get out. Very nearly had to drill them out but thankfully I got them out with some 
I only replaced one on either side as they came with the new discs. But yeah… heaps of folks don’t bother with them.
I always found the best way is to use the correct sized screwdriver fitted on and give it a few taps with a hammer. I think it shocks the thread and helps free them up. Then just a bit of anti seize on new ones to save the trouble next time.
That’s probably what I should have done the first time around. 
They are M6x1.25 and the thread is about 10mm long.
M6x1.25 is unusual as standard thread pitch is 1mm. 1.25 is normally m8. Thanks .
Let me double check that then… But probably is M8.
My car no longer has them, the roadwheel bolts hold everything together.