BOLT SMARTER: Find out more • ASTM F3148-17a Specification

• RCSC 2020 Combined Method

• ANSI/AISC 358 For Seismic
Applications
TNA®: Industry Approved. • AISC 360-22 Specification for Structural Steel Buildings

• AASHTO LRFD Bridge Design Specification
• AASHTO Steel Bridge Fabrication Specification

• AREMA Manual for Railway Engineering

The TNA® System

TNA® is the only fastening system that delivers both a quantifiable Snug Tight condition – ensuring every bolt in a connection meets a minimum requirement for tension – and the precise required angle for the perfect final pretension. No other system or method can match the TNA® Torque + Angle Fastening System for producing the highest level of accuracy and reliability in both the snug and final tensioning processes.

Our TNA® Bolts meet the requirements of ASTM F3148 and are 100% Melt & Manufacture in the U.S.

The Combined Method (Torque + Angle) is an approved RCSC installation method.

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144ksi Bolts

ASTM F3148 Specification
144ksi Fixed Spline Bolt Assemblies

For application using the Torque + Angle Installation Method. This revolutionary structural bolt grade is designed to allow for a single bolt grade to be used in all connection types.

144ksi Bolts

ASTM F3148 Specification
144ksi Fixed Spline Bolt Assemblies

For application using the Torque + Angle Installation Method. This revolutionary structural bolt grade is designed to allow for a single bolt grade to be used in all connection types.

TAE Series Tools

Torque + Angle Installation (Combined Method)

Precision. Accuracy. Repeatability. These are just a few of the benefits of our TAE Series tool line. The TAE Series tools are designed for use exclusively as part of our TNA® Torque + Angle Fastening System. Through the use of Torque for the snug operation and Angle for the Pre-Tensioning operation our TAE tools provide control and accuracy unmatched by any other system on the market.  Our TAE tools provide the simplest and most accurate means to perform the RCSC Approved Combined Method of installation.
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