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GB5782 hexagon head bolt is a specification for hexagon head bolts in the Chinese National Standard (GB), widely used in industries such as machinery, construction, automobiles, and equipment
1. Basic Definition
The GB5782 standard specifies metric hexagon head bolts, whose main feature is that the bolt head is hexagonal and can be installed or removed using a hex wrench or socket tool.
This standard is applicable to situations where fastening connections are required.
2. Basic specifications of hexagonal head bolts
According to the GB5782 standard, the main specifications of hexagonal head bolts include the following:
Thread specification: The outer diameter of bolts is usually metric thread, such as M6, M8, M10, M12, M16, etc. (M represents metric thread, followed by thread diameter).
Bolt length: The total length from the bolt head to the end of the thread, usually determined by usage requirements.
Thread length: refers to the length of the effective threaded portion on a bolt, usually a part of the bolt.
Common hex head bolt size reference:
M6 × 16, M8 × 20, M10 × 25, M12 × 30, M16 × 40, etc. (specific dimensions can be customized according to needs).
3. Material and performance requirements
According to the GB5782 standard, the material and performance requirements for hexagonal bolts are as follows:
Materials: Commonly used materials include carbon steel (such as Q235, 45 # steel, etc.), alloy steel, stainless steel, etc. The materials should have sufficient strength and corrosion resistance.
Common materials include:
Carbon steel: such as Q235, 10 #, 20 #, etc;
Alloy steel: such as 35CrMo, 40Cr, etc;
Stainless steel: such as 304, 316, etc., suitable for environments that require corrosion resistance.
Strength grade: GB5782 standard specifies bolts of different strength grades, such as:
4.8 level (applicable to general load requirements);
8.8 grade (high-strength bolts, commonly used for connections that withstand high tensile forces);
Grade 10.9 (higher strength, suitable for high load applications).
4. Dimensions of hex head bolts
According to the GB5782 standard, the size specifications of hexagonal bolts mainly involve the following aspects:
Thread diameter: such as M6, M8, M10, M12, M16, etc.
Bolt length: Depending on specific usage requirements, the length ranges from 16mm to 200mm, and some special lengths can be provided according to customized requirements.
Head size: The head shape of a hexagonal bolt is hexagonal, and the width and height of the head are usually standardized according to the bolt diameter.
5. Surface treatment
In order to enhance the corrosion resistance of hexagonal bolts and extend their service life, GB5782 standard specifies various surface treatment methods:
Galvanizing: Electroplating or hot-dip galvanizing, commonly used to improve the rust resistance of bolts.
Black oxidation treatment: A layer of black oxide film is formed through oxidation treatment to increase corrosion resistance.
Spray coating treatment: used to increase the wear resistance and appearance of bolts.
