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Overview
Maximum Torque
Minimum End Load
Longer Bit Life
Comparisons
Hitachi
Dietrich
Grabber
 
Square
Ahh, four points of contact again. Only this time the contact surfaces aren't even close to perpendicular to a line through the center which leads to inefficient torque. While the square recess has many advantages over the Phillips, when it comes to high torque applications bits wear out very quickly and it's difficult to keep from stripping out the screws. Once a square screw recess is stripped, good luck getting it out. Four points of contact just isn't enough anymore.
LOX Test Results
In a recent independent test, LOX screws demonstrated more than triple the torque capacity of square. Applying increasing torque to the recess, the square drive cammed out with 37.79 Kgf-cm, which is well before the screw could be fully driven and seated. In every comparable test the LOX recess screw seated completely, with an average force of 82.11 Kgf-cm. In other tests, the LOX screw tolerated the maximum 100 Kgf-cm of force delivered by the test equipment and still did not cam out. In other words, the LOX exceeded the ability of the testing equipment to apply force. That's MAXIMUM TORQUE!
LOX Recess Phillips Square
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