Drywall Screw Thread Forms: Fine, Coarse and Hi-Low

Three forms, not one product

Drywall screws are a construction industry combination rather than a single item. We make three: fine thread, coarse thread and high-low.

Fine and coarse

Fine thread goes into light gauge steel stud; coarse thread goes into timber. The choice is not cosmetic — fine thread in timber strips the hole, coarse thread in steel stud stalls the driver.

What the hi-low geometry does

The hi-low design uses a much flatter and sharper thread angle. The high thread runs at 30 degrees, the low thread at 60 degrees, and the low thread stands at only half the height of the high one. The result is lower driving torque, greater pull-out resistance and a lower risk of the screw breaking — the low thread clears the debris the high thread cuts.

The head is doing work too

The bugle head applies indented pressure as it seats, which is what lets it sink into the board without breaking the wallpaper or the gypsum surface. A flat or pan head at the same torque cuts straight through the facing.

Everything on this page describes the specification range Beyond Industry Groups Limited works to. Where a figure is a laboratory test result rather than a service life, it is described as such.