A screw is a tool that uses the physics and mathematics of the oblique circular rotation of the object and the friction force to gradually tighten the objects and parts. Screws are a common term for fasteners, an everyday spoken word. Screws are indispensable industrial necessities in daily life: extremely small screws used in cameras, glasses, clocks, electronics, etc.; general screws used in televisions, electrical products, musical instruments, furniture, etc.; as for engineering, construction, and bridges, large-scale screws are used. Screws and nuts; transportation equipment, airplanes, trams, cars, etc. are used for both large and small screws. Screws have important tasks in the industry. As long as there is an industry on the earth, the function of screws will always be important. The screw is a common invention in people's production and life for thousands of years. According to the application field, it is the first invention of mankind. Next, 2H Heavy Hex Nuts Supplier will introduce the parameters and characteristics of the screws:

1. Head type. This is easy to identify. It can be intuitively judged with the naked eye, such as a word head, or other head shapes.

2. Diameter. This is very accurate, which is difficult to judge with eyes. At this time, we often use vernier calipers to measure the length. Note that this diameter includes the length of the tooth.

3. Length. Also use a vernier caliper, note that this length does not include the length of the head.