by AL » Sat Mar 18, 2006 4:47 pm
sorry mate only one size will fit, the M12 basically means its a Metric thread with an outer diameter of 12 millimeters, but the pitch is all important here. a pitch of 1.25mm gives a finer thread than a pitch of 1.5mm.
for a 1.5 pitch if i screw it "in or out" for ( one full turn ) the BOLT/NUT/SCREW, will move in or out by a distance of 1.5mm.
what CHUCK has stamped on his nut would indicate a 12mm diameter with pitch of 1.5 mm. ( M12x 1.5 )