What are the specifications and standards for hexagonal nuts?

1. Size specifications
Nominal diameter: The nominal diameter of a hexagonal nut refers to the major diameter of the thread, usually expressed in millimeters (mm). Common nominal diameters include M4, M5, M6, M8, M10, M12, M14, M16, M18, M20, M22, M24, M27, M30, M36, etc. Different nominal diameters are suitable for different connection requirements.
Pitch: The pitch refers to the axial distance between two points corresponding to the mid-diameter line of two adjacent thread teeth. The pitch of a hexagonal nut usually matches the pitch of the bolt. Common pitches include 0.5mm, 0.7mm, 0.8mm, 1mm, 1.25mm, 1.5mm, 1.75mm, 2mm, 2.5mm, 3mm, etc.
Width across flats and thickness: The width across flats of a hexagonal nut refers to the distance between the two parallel sides of the hexagon, and the thickness refers to the height of the nut. Hexagonal nuts with different nominal diameters have corresponding standards for width across flats and thickness. For example, the width across flats of M6 hexagonal nuts is 10mm and the thickness is 5mm.
2. Strength grade
Common strength grades: The strength grades of hexagonal nuts are usually expressed in numbers, such as 4, 5, 6, 8, 10, 12, etc. These numbers represent the minimum tensile strength of the nut in megapascals (MPa). For example, a hexagonal nut with a strength grade of 8 has a minimum tensile strength of 800MPa.
Application of different strength grades: Hexagonal nuts of different strength grades are suitable for different connection occasions. Generally speaking, nuts with lower strength grades are suitable for general connection needs, while nuts with higher strength grades are suitable for occasions with higher connection strength requirements, such as mechanical equipment, building structures, etc. When selecting the strength grade of the hexagonal nut, it should be determined according to the stress conditions of the connection and the use environment.
3. Standard type
National standard: In China, the national standards for hexagonal nuts are mainly GB/T 6170, GB/T 6172, GB/T 6175, etc. These standards specify the size, technical requirements, inspection methods, etc. of hexagonal nuts.
International standard: Common international hexagonal nut standards include ISO, DIN, ANSI, etc. For example, ISO 4032 is the hexagonal nut standard established by the International Organization for Standardization, DIN 934 is the German standard, and ANSI B18.2.2 is the American national standard. These standards may differ in size, strength grade, etc.
4. Other specifications
Surface treatment: There are many ways to treat the surface of hexagonal nuts, such as galvanizing, chrome plating, blackening, phosphating, etc. Different surface treatment methods can improve the corrosion resistance, aesthetics and wear resistance of the nuts. When choosing hexagonal nuts, you can choose the appropriate surface treatment method according to the use environment and requirements.
Precision level: The precision level of hexagonal nuts is usually divided into three levels: A, B, and C. The higher the accuracy level, the higher the dimensional accuracy and thread accuracy of the nut. In some occasions where the connection accuracy is required to be high, it is necessary to choose hexagonal nuts with higher accuracy levels.
The specifications of hexagonal nuts include size specifications, strength grades, standard types and other specifications. When selecting and using hexagonal nuts, it is necessary to select products that meet the standards according to the specific connection requirements and use environment to ensure the reliability and safety of the connection.
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