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China Releases New National Standard for Precision Fasteners, Boosting Quality of High-End Equipment

The State Administration for Market Regulation and the National Standardization Administration Committee recently jointly released the "General Technical Specifications for Fasteners Used in Precision Machinery" (GB/T 4679-2025), which will come into effect officially on October 1, 2025.

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What are the differences in performance and application among high-strength bolts made from different materials?

High-strength bolts made from different materials vary primarily in their mechanical properties—such as strength, toughness, and corrosion resistance—which directly determine their suitability for specific applications. Currently, the three main material categories for high-strength bolts are medium-carbon steel, low-carbon alloy steel, and alloy structural steel.

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2025

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What are the specific differences among the performance grades of high-strength bolts?

The core difference in performance grades of high-strength bolts lies in their tensile strength and yield strength. Specifically, the first digit of the grade designation, when multiplied by 100, gives the minimum tensile strength (in MPa), while the last two digits, when multiplied by 10 and then by 0.9, indicate the minimum yield strength (in MPa). Currently, the most commonly used high-strength bolt performance grades include 8.8, 9.8, 10.9, and 12.9.

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2025

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What is the standardized production process for standard parts?

This question touches on the core of efficient production for standard components. The standardized production process for these parts revolves around "uniform specifications, controllable quality, and efficiency first," and is primarily divided into four key stages.

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