The standards for precision steel pipes are usually formulated by international, national, or industry organizations to ensure that the quality, size, and performance of pipes meet specific requirements. Some common precision steel pipe standards from precision steel pipe manufacturers include:

ASTM Standards: The American Society for Testing and Materials (ASTM) has released a series of standards for precision seamless steel pipes, such as ASTM A519 (precision seamless steel pipes for mechanical purposes) and ASTM A106 (carbon steel precision seamless steel pipes).

EN standards: The European Commission for Standardization (CEN) and the European Materials Standards (EN) have issued standards for precision seamless steel pipes, such as EN 10305 (Technical delivery conditions for precision seamless steel pipes).

JIS Standard: The Japanese Industrial Standard (JIS) includes a series of standards for precision steel pipes, such as JIS G3445 (Mechanical Properties and Dimensions of Precision Seamless Steel Pipe).

DIN standards: The German Institute for Standardization (DIN) has released a series of standards for precision seamless steel pipes, such as DIN 2391 (Technical delivery conditions for precision seamless steel pipes).

GB standard: The Chinese National Standard (GB) includes some standards for precision seamless steel pipes, such as GB/T 3639-2000 (Cold drawn precision seamless steel pipes).

These standards typically specify requirements for the materials, chemical composition, mechanical properties, dimensions, tolerances, processing methods, and testing procedures of precision seamless steel pipes. Manufacturers and users can choose appropriate standards based on their specific needs to ensure that the purchased precision steel pipes meet their expected usage and performance requirements. In addition, precision steel pipe manufacturers usually follow international and national quality management standards, such as ISO 9001, to ensure product consistency and quality.