Zephyr swing arm screws

I am putting a Zephyr 750 back together at the moment and wasn't very good at labelling bags of screws :S I'm currently trying to put the excentre chain adjusters back in and am having problems with the clamping screws. I know they are M10 x 40 and usually I'd assume 1.25mm pitch, but I have screws with 1.25 and 1.5mm pitch in my pile. Problem is, some of the powder coating got on the threads and niether the 1.25mm nor the 1.5mm pitch socket cap screws will go in easily. I need to chase the threads with a tap, but need to know which one. Can anyone help me out?

I have a photo of those bolts at hand. From look of them, it has to be M10x1.5 thread.



I have them in the box with parts for my KZ650 (for Zephyr 550 swingram which equipped with same adjuster bolts). I'll measure thread tomorrow.

Thanks gazzz. They do look like coarse threads - 1.25 pitch should have room for 32 threads on a M10 x 40 screw, they have space for about 26-27 which puts them at 1.5mm.
First time I've ever seen coarse M10 threads on a Japanese bike (only dealt with Honda and Kawa, though).

Thread M10x1.5mm confirmed by measurement.

Sweet, thanks gazzz!