Wood screws are similar to machine screws and can be directly screwed into wooden components (or parts) to fasten a metal (or non-metal) part with a through hole and a wooden component. This kind of connection is also a detachable connection. The common ones are iron and copper. Depending on the nail head, there are round, flat, and oval heads.

Screw classification:

There are many types of screws such as machine screws, self-tapping screws, self-drilling screws, wallboard nails, fiberboard nails, wood screws, hexagonal wood screws, combination screws, furniture screws, electronic screws, and so on. Qingdao Haorui is a manufacturer of standard parts and non-standard parts with many years of production and processing experience, which can produce all kinds of bolts and screws.

Screw thread:

Screws have different threads. Among them, the inch system uniform thread is widely used in inch system countries. This type of thread is divided into three series: coarse thread series UNC, fine thread series UNF, extra fine thread series UNFF, plus a fixed pitch series UN. Marking method: thread diameter—number of teeth per inch series code—precision grade.