Hex flat washer and combination hex nut connection factors

When selecting a combination hex flat washer and locknut, factors such as pipeline operating pressure, operating temperature, medium type, and gasket type should be considered simultaneously.

Gasket types and operating pressures and temperatures directly affect the strength requirements of fastener materials. For instance, flange connections for low-pressure pipelines sealed with wrapped gaskets containing highly toxic substances, even though the operating pressure and temperature of the pipeline are not high, due to the higher required compressive force to form the initial seal of the wrapped gasket, it necessitates a larger load-bearing capacity for the hex flat washer and combination screw nuts. Therefore, in such cases, high-strength alloy steel materials are required for the fasteners.