The most widely used thread today, ‘ISO Metric’ or ‘M’ for short. Available in coarse and fine threads in most materials and sizes, also DIN standards are very popular.

They come in a variety of strengths:

• Grade 4.8: Mild to medium carbon steel, common for machine screws and threaded bar.
• Grade 8.8: High tensile carbon steel, common for metric hex head bolts and setscrews.
• Grade 10.9: High tensile alloy steel, common for metric hex head bolts and setscrews and socket screws
• Grade 12.9: High tensile alloy steel, common for metric hex head bolts, setscrews and socket screws.