Flange nuts can be divided into two categories according to the material. The first is ordinary carbon structural steel, which is what we usually call carbon steel; the second is stainless steel. Carbon steel is divided into Q195, 08AL and alloy steel according to the carbon content and strength of the steel. Stainless steel is divided into 304, 321, 304L, 316, 316L, 317, 317L, 310S and so on.

The surface treatment of DIN6923 flange nuts is generally divided into two types: yellow zinc and zinc plated, they are cold-galvanized. For hot dip galvanizing, hex flange nut is inappropriate. This is because the residual zinc sticking to the thread after hot-dip galvanizing is not easy to remove, and the thickness of the zinc layer is uneven, which affects the fit of the parts.

A flange nut is a nut that has a wide flange at one end. This helps to distribute the pressure of the nut over the part being secured, reducing the damage of the part and making it less likely to loosen as a result of an uneven fastening surface.

According to provisions of the national standard GB/T 3098.2-2015 "Mechanical Properties of Fasteners Nuts", bolts made of carbon steel and alloy steel have 7 types of mechanical properties under the condition of environmental dimension of 10℃～35℃. They are 04, 05, 5, 6, 8, 10, 12 respectively.

The function of hexagonal nut is to cooperate with bolt to achieve the purpose of fastening. Usually, in order to improve the service life of the hexagonal head hex nut, hot dip galvanized plating is the first choice for the hexagonal nut.

Nylon locking hexagon nuts mainly rely on the nylon washer in the hexagon nut to play a locking role, which is usually referred to as nylon nut or nylon insert lock nut or just locking nut in the industry. Nylon hex nuts are mainly used in conjunction with threaded screws or bolts for connection.

Hex nuts are used in conjunction with screws and bolts to connect parts. ASME ANSI hex nut covers the dimensional requirements of inch series hex nut. The common standard of ASME/ANSI hex nut is ASME B18.2.2. It includes normal hex nut, hex thin nut, hex thick nut and heavy hex nut. The size from 1/4-4" diameter. DIN standard is DIN934.