As Dan said, M7mm x 0.75mm x 1 is the SKM-88 thread size. I just did the threading for one a couple of days ago and can vouch for that specification.
That is an easy tap and die size to get quite cheaply. I got a set from a local tool store not long ago off the shelf (not special order) ... cost under $10 for the tap and the die was not much more ... tap made in China (no name), die made in Poland (TMX brand) both HSS.