Ninety300E is correct. Also to be considered is material(alloy), grade(strength) and finish(plating). Metric nomenclature usually starts with "M" such as M8-1 x 15 Socket Cap etc. The book I have here (from Tacoma Screw Products) shows standard M8 to be pitch 1.25 and M6 to be 1.0. However that doesn't mean you don't have a M8-1. A pitch of 1mm = 25.4 TPI and 1.25mm = 20.3 TPI so you can measure how many threads in an inch and figure out the pitch. And the diameter is pretty easy to measure.

Mike

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1998 C230 330,000 miles (currently dead of second failed EIS, yours will fail too, turning you into the dealer's personal human cash machine)
1988 F150 144,000 miles (leaks all the colors of the rainbow)
Previous stars: 1981 Brava 210,000 miles, 1978 128 150,000 miles, 1977 B200 Van 175,000 miles, 1972 Vega (great, if rusty, car), 1972 Celica, 1986.5 Supra