LeJeune Bolt is the leading international supplier of structural fasteners and tools as well as your source for the ASTM F3148 TNA Fastening System. With the recent approval of the Combined Method of installation in the 2020 edition of RCSC "Specification for Structural Joints Using High-Strength Bolts" and inclusion in the upcoming 2023 edition of the AREMA Manual for Railway Engineering and 2023 Editions of AASHTO LRFD Bridge Design Specifications and Steel Bridge Fabrication Specifications F3148 TNA Bolt Assemblies and Torque & Angle installation can be specified with confidence knowing the necessary industry approvals are complete. Contact LeJeune Bolt Company to learn more about how our TNA Fastening System can provide improved efficiency, quality control, and cost savings for your next project.