Introduction to relevant standards and specifications for double headed bolts?

A double headed bolt is a special type of bolt that has threads on both ends and can be screwed into a nut at either end. It is mainly used in devices or equipment that require partial disassembly and is a convenient and effective fastener. The relevant standards and specifications for double head bolts are also very important, and will be introduced below.

1、 Relevant standards

1. GB/T 13680-2000 double head bolts

This standard is a Chinese national standard that specifies the size, shape, material, quality requirements, and inspection methods of double head bolts. Among them, there are detailed specifications for the length, thread cross-sectional diameter, and nominal diameter of double head bolts for reference and use by manufacturers and users.

2. DIN 939 double head bolt

This is a German industrial standard and also a double head bolt standard, with dimensions, shapes, and quality requirements similar to Chinese national standards. Unlike national standards, DIN 939 specifies details such as the grade and surface treatment method of double head bolts.

3. ASTM A193 double head bolt

This is the double head bolt standard of the American Society for Testing and Materials (ASTM), which is applicable to the selection of fasteners in high temperature and high pressure environments, including the size, shape, material, and mechanical performance requirements of double head bolts. The production and use of products need to comply with this standard.

2、 Relevant specifications

1. Specification for railway double head bolts

The specifications formulated for the railway transportation industry stipulate the requirements for the size, material, standard grade, surface treatment, tensile strength, torque resistance, and inspection of double head bolts. Double head bolts in the railway industry must be produced, delivered, and used in accordance with the specifications.

2. Specification for double head bolts in petrochemical installation engineering

This specification is to standardize the use of double headed bolts in the petrochemical industry, which specifies important requirements such as grade, material, size, standard, surface treatment, etc. of double headed bolts, and also covers relevant content of bolt inspection and product maintenance.

3. Specification for National Defense and Military Industry Stud Bolts

In the military industry, the application of double head bolts has always been very extensive, and their safety and reliability requirements are particularly high. Therefore, there are specialized specifications for the production of double head bolts in the military industry, including requirements for product design, production, inspection, and maintenance.

The above three specifications are all formulated based on different industry fields, with the aim of ensuring the quality, technical indicators, and safety of double head bolts after use. The specifications are based on corresponding laws and regulations, making the products undergo strict inspection and testing, and more in line with standards and specifications.