What are difference HIT C and HAS U anchor bolt

Thanks for your question HAS-U range of rods are the standard sizes and lengths that are available more or less 'Off the Shelf' and are listed with the European Technical Assessments and the design software. The HIT-C rods are non standard items so 'specials' and are made to order subsequently they are not listed in the software or directly named in the ETA but are covered as the mechanical properties are the same and 3.1 certification can be obtained if required.