M12, LONG, Hex Bolts, Part Threaded, BZP, Metric, 8.8 High Tensile.

M12, LONG, Hex Bolts, Part Threaded, BZP, Metric, 8.8 High Tensile.
 
Thread Size = 12mm
Head/Spanner Size = 19mm
 
Thread Length: Please use the below guide to work out the thread length on the bolts, Bolts measured from underneath the head.
 
0 to 125mm - 2 x Diameter (12mm) + 6mm = 30mm Thread
125 to 200mm - 2 x Diameter (12mm) + 12mm = 36mm Thread
200mm + - 2 x Diameter (12mm) + 25mm = 49mm Thread