Hex lag screw
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For wood screws, one section is a polished rod


 Main category

The common types of wood screws are iron and copper. Depending on the nail head, there are round head,

Other samples of wood screws
Other samples of wood screws (12 photos)
Flat head type and oval head type. There are two types of screw heads and cross recessed screws on the nail head. Generally, round head screws are made of mild steel and are blue. The flat head screws are polished. The oval head screws are usually plated with cadmium and chromium. Commonly used to install hinges, hooks and other hardware accessories. The specifications are determined by the rod diameter, length and nail head type.
main feature
For wood screws, one section is a polished rod, and the thread angle and pitch of wood screws are different from those of self-tapping.
Self-tapping screws have high hardness, wide thread spacing, deep threads, and non-smooth surface. Wood screws are the opposite. The other difference is more obvious. There is no thread in the back section of wood screws. Self-tapping screws are generally heat-treated, wood screws are not needed. The concept of self-tapping screws is actually very general, because there are many different types of heads.
The purpose of wood screws: similar to machine screws, but the thread on the screw is a special rib for wood screws, which can be screwed directly into the wood components (or parts).
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