Tag Archives: lag screws

Lag Screw vs. Lag Bolt

What is the correct way to refer to a lag, screw or bolt?

Although these terms are used interchangeably, lags should technically be referred to as a screw and not as a bolt. A bolt is a fastener with machine thread that can accept a nut. A bolt is properly assembled and tightened by rotating the nut. A screw, on the other hand, is a fastener that is... Read more

Lag Screw Torque Specifications

Are torque specifications or values available for lag screws?

There are no documented torque values for lag bolts or screws. The reason for this lies in the definition of torque when discussing threaded fasteners. To put it simply, torque is a measure of the twisting force required to spin a nut up along the threads of a bolt. Lag screw threads are driven into wood, and therefore,... Read more