What are the screws for agricultural machinery accessories

The screws of agricultural machinery accessories are important parts used to connect and fasten various components of agricultural machinery. The following is an introduction to them:

Types

Ordinary screws: usually directly screwed into circular holes with internal threads on the part, used to tighten or adjust the position of the part.

. There are various shapes of the head, such as straight, cross, hexagonal, etc

Self tapping screws: do not require pre processing of internal threads, can be directly screwed into softer materials such as plastic, thin metal plates, etc., and form internal threads on the material through their own threads to achieve a tight connection. Common types include regular self tapping screws and self cutting self tapping screws

Expansion screw: composed of a screw and an expansion tube, etc. The tail of the screw is conical, and the inner diameter of the cone is larger than that of the expansion tube. Mainly used to fix agricultural machinery components on basic structures such as walls and floors

Higher strength screws: used for connecting agricultural machinery components that can withstand large loads and torques, such as engines, transmissions, and other parts. The material is usually alloy steel or higher strength carbon steel, which has undergone special heat treatment and surface treatment to have high strength and hardness

Specifications

Metric specifications: measured in millimeters, common ones include M4, M5, M6, M8, M10, etc., where M represents metric threads and the number represents the nominal diameter of the thread.

. For example, M8 represents a nominal thread diameter of 8 millimeters

British specifications: measured in inches, such as 1/4, 3/8, 5/16, etc., followed by the number of teeth per inch, such as 1/4-20, indicating a nominal diameter of 1/4 inch with 20 teeth per inch

American specifications: Similar to British specifications, but may differ in some details. Commonly used series include UNC (coarse teeth), NDF (fine teeth), etc. For example, 4 # -40 represents the American standard No. 4 screw, which has 40 teeth per inch

Selection

According to the usage environment: for agricultural machinery parts working in humid and corrosive environments, corrosion-resistant (based on actual reports) stainless steel screws should be selected.

; In high-temperature environments, it is necessary to choose alloy screws that are resistant to high temperatures (based on actual reports)

According to the load requirements: components that can withstand high tension, pressure, or torque should use screws with higher strength; For some light load connections, ordinary strength screws can meet the requirements

According to the connection method: different connection methods also have different requirements for screws. If components need to be disassembled frequently, ordinary screws that are easy to disassemble can be used; For situations that require suitable installation and disassembly speed, self tapping screws or expansion screws can be considered