metric and imperial bolt size chart
nch (TPI) | | Standard Sizes | M3, M4, M6, M8, M10, M12, etc. | 1/4, 3/8, 1/2, 5/8, 3/4, etc. | | Conversion | 1 inch = 25.4 mm | 1 mm ≈ 0.03937 inches | Compatibility and Interchangeability While metric and imperial bolts are not directly interchangeable due to differing thread standard