National Standards for Anti-loosening Nuts

GB/T 6182-2016: Applicable to all-metal hexagonal prevailing torque nuts, this standard specifies the dimensions, mechanical properties (e.g., tensile strength ≥ 800 MPa), and anti-loosening test methods for nuts with thread sizes ranging from M3 to M64. The standard requires that, under vibration conditions, the nuts must successfully complete a test of at least 50,000 cycles without loosening (refer to the *Mechanical Design Handbook*, 6th Edition).

 

GB/T 6187-2016: Specifically addressing hexagonal lock nuts with non-metallic inserts, this standard stipulates that the embedding depth of the nylon ring must be at least 1.5 times the thread pitch, and that the nuts must maintain their locking function within a temperature range of -50°C to +120°C.

 

Standards for anti-loosening nuts may vary depending on the regulations of different countries or industries; common international standards include ISO, DIN, and ANSI. These standards define technical parameters-such as dimensions, materials, and performance requirements-to ensure the reliability and safety of anti-loosening nuts across a wide range of application scenarios.