What is the difference between a lag and metal screw ... | 合法醫療器材資訊網

2020年3月13日—Thenamelagscrewderivesfromtheiroriginaluseinsecuringbarrelstaves,alsoknownaslags.Alagscrewrequiresaholedrilledatthe ...

Written by Dr. Jody Muelaner

A lag screw is a heavy-duty wood screw, a metal screw is typically a small self-tapping screw for sheet metal

Lag screws and metal screws are both types of self-tapping screws. Lag screws are primarily designed to be screwed into wood while metal screws are intended to be screwed into sheet metal.

A lag screw, known in the UK as a coach screw, is a sturdy screw often with an externally driven square or hex drive head. It features coarse threads and a tapered point. It’s typically much more heavy-duty than conventional wood screws that are fitted with slotted or Pozidriv heads.

The name lag screw derives from their original use in securing barrel staves, also known as lags. A lag screw requires a hole drilled at the same diameter as the shaft of the screw, a gimlet...