Hello. I am the General Manager at Portland Bolt. Most ASTM specifications imply inch-series diameters, with the exception of specifications such as A325M that is written for metric product. Most of the Tables in the F1554 specification deal with imperial diameters. Examples of this are TABLE 4 Axial Tensile Properties for Full-Size Anchor Bolts and TABLE 5 Minimum Body Diameter. However, TABLE 3 Tensile Properties for Bars and Machined Specimens, offers metric equivalents for diameters and MPa for strength requirements. Therefore, one could assume that metric sized F1554 anchor bolts could be provided. Unfortunately, I am not aware of any domestic anchor bolt manufacturers that are currently producing metric sized F1554 anchor bolts on a regular bases. We ship F1554 anchor bolts outside of the country on a regular basis and often perform a soft conversion from metric to imperial diameters when the customer allows, rounding UP to the nearest eighth inch increment.