What are the differences between flange nuts and hex nuts?

The dimensions and thread specifications of flange nuts are basically the same as those of ordinary hexagonal nuts. However, compared with hexagonal nuts, the gasket and nut are integrated, and there are anti-slip tooth patterns on the bottom, which increases the distance between the nut and the nut. The surface area of the workpiece is in contact, which is stronger and has greater pulling force than the combination of ordinary nuts and washers.
The common specifications of flange nuts are generally below M20. Because most flange nuts are used on pipes and flanges, they are constrained by the workpiece. Compared with nuts, the specifications of flange nuts are smaller. Some flange nuts above M20 are mostly flat flanges, that is, there are no teeth on the flange surface. Most of these nuts are used in some special equipment and special places. Generally, sales manufacturers do not have them in stock.
Flange nut connection factors
When selecting nuts for flange connections, factors such as pipeline operating pressure, operating temperature, media type and gasket type should also be considered.
The gasket type, like the operating pressure and operating temperature, directly imposes requirements on the strength of the fastener material. For example, the flange connection of a low-pressure highly toxic medium pipeline sealed with a spiral wound gasket. Although the operating pressure and temperature of the pipeline are not high, the specific pressure required for the spiral wound gasket to form an initial seal is relatively large, thus The fasteners are required to bear a large load. Therefore, in this case, the fasteners are required to be made of high-strength alloy steel.