Cyclone Magnum AT400 – Pneumatic Torque Wrench The AT400 pneumatic torque wrench is a 3/4” drive, continuous rotation, reversible pneumatic torque tool delivering controlled torque accuracy of /- 5%. Torque range is 67-400 ft-lb/ (91-542 N-m). ‘Form follows function’ design philosophy has provided state of the art, ergonomic features the end user will use and appreciate. Efficient motor design coupled with a rugged gear box provides long lasting service even in the harshest field conditions and usage environments. Our pneumatic torque wrench is simply the toughest, most robust pneumatic torque wrench in its class on the planet. We’re so confident in its design that we’ve doubled the standard industry warranty to two full years!