Originally Posted by
rhenning
You can buy a digital caliper and Metric and English thread guage for under $20 and have the correct answers. Roger
I use these both at home and at work and recommend them without reservation:
The Original Thread Checker - Bolt, Screw, & Nut Identification Tool!
They are nice because they check both inside and outside threads.
Be wary of 10mm sizes, there are 3 different thread pitches, 1.0, 1.25 and 1.5mm