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What are the differences between flange nuts and hexagon nuts

Update:05-01-2021
Summary:

The size of flange nut and general hex nut is basically […]

The size of flange nut and general hex nut is basically the same as the thread specification, but compared to hex nut, it is a one-piece gasket and nut, and there are anti-skid teeth underneath, which increases the nut and workpiece Compared with the combination of ordinary nut and washer, it is stronger and more tensile.
Generally, the specifications of common flange nuts are generally below M20. Because most flange nuts are used on pipes and flanges, they are restricted by the workpiece, and the specifications of flange nuts are less than that of nuts. Some flange nuts above M20 are mostly flat flanges, that is, there is no tooth pattern on the flange surface. Most of these nuts are used in some special equipment and special places, and the general sales manufacturers do not have the spot.
When selecting nuts for flange connection, factors such as pipeline operating pressure, operating temperature, medium type and gasket type should be considered at the same time.
The type of gasket is the same as the operating pressure and operating temperature, which directly impose requirements on the strength of the fastener material. For example, the use of spiral wound gaskets to seal the flange connection of low-pressure and highly toxic medium pipelines. Although the operating pressure and temperature of the pipeline are not high, the specific pressure required to form the initial seal of the spiral wound gasket is relatively large. The fasteners are required to bear a large load. Therefore, in this case, the fasteners are required to use high-strength alloy steel materials.

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