The PTB-ETA1-PRO through bolt is a fully threaded, torque controlled, wedge expansion anchor designed for consistent performance in cracked and uncracked concrete. The anchor is easy to install and suitable for a variety of base materials with a nominal drill bit size the same as the anchor diameter. The wide range of available PTB-ETA1-PRO anchor sizes also cover all common capacity demands with a superior load-displacement response that qualifies the PTB-ETA1-PRO through bolt for both standard and adverse loading conditions.