Square lag screws come with a rustic look. They are used often in wood construction and sometimes for aesthetic purposes too. Square leg screws are generally available in the marketplace as a standard stock product.
Standard Thread Length
The minimum thread length for square lag screws shall be equal to half the nominal screw length plus 1/2″ or 6″, whichever is less. One should consider longer than standard thread lengths for lag screws which are extremely long.