Hexagon nuts / lock nuts / special nuts
Hexagon nuts, lock nuts, nuts with flange/washer, snap nuts, special nuts,...
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There are a very large number of screw nuts. The most common is the hexagon nut. It has a hexagonal shape and is tightened with a wrench. Its application area is diverse, e.g. in the automotive sector, mechanical engineering, furniture construction, in the garden or for DIY. Hexagon nuts are available in different heights, e.g. the low hexagon nuts or the higher shapes up to sleeves.
Square nuts were the first type of nut to be produced. Their square shape allows them to be used as insert nuts, e.g. in the field of electronics or electrical devices.
Cap nuts serve as a visually appealing end to screw connections. They can have the well-known high shape, but also a slightly flattened shape. Cap nuts are tightened using a hexagon attachment attached to the lower end.
Knurled nuts in low or high form allow the nut to be easily tightened and loosened. They are also a visually appealing component.
Types of nuts according to protection against loosening
The second way to distinguish nuts is the protective measure that prevents the nut from being accidentally loosened. A lock nut, i.e. a second nut that secures an existing connection at the same height, is conceivable as a safety feature. Other options are castle nuts in combination with a (safety) split pin, self-locking nuts with a plastic or solid metal clamping part or the palm nut.
Material and strength of screw nuts
The largest class of screw nuts is made of bright steel with variable strength (steel class 4, 5 or 8 or high-strength nuts of class 10 and 12). A side note: unlike screws (e.g. strength class 8.8), the second part is missing when specifying nuts. Due to their design, screw nuts only have the tensile strength specified and not the lower yield strength, which comes after the dot.
Corrosion and rust protection
Rust is a big problem with nuts. Water, whether through direct contact or the water content in oxygen, causes rust if the screw nut is not protected from the weather by corrosion protection or if it is not made of a special steel - stainless steel. Stainless steels are usually A1 and A2. However, they only offer limited rust protection, while highly acid-resistant steels such as A4 and A5 are also resistant to acids or salt water. The far larger class of nuts, however, are made of bright steel with variable strength. These are usually bright, i.e. untreated, and rust 'immediately'. The most common treatment is electrogalvanization, but hot-dip galvanization, burnishing, phosphating or chromating are also common processes that protect against rust.
Special types of nuts
Other nuts are cage nuts, as used in 19-inch racks, or nuts for furniture (e.g. set nuts, sleeve nuts, knock-in nuts or screw-in nuts). To connect other components with the help of a nut, ring nuts, chip lock nuts or T-slot nuts are used.
Square nuts were the first type of nut to be produced. Their square shape allows them to be used as insert nuts, e.g. in the field of electronics or electrical devices.
Cap nuts serve as a visually appealing end to screw connections. They can have the well-known high shape, but also a slightly flattened shape. Cap nuts are tightened using a hexagon attachment attached to the lower end.
Knurled nuts in low or high form allow the nut to be easily tightened and loosened. They are also a visually appealing component.
Types of nuts according to protection against loosening
The second way to distinguish nuts is the protective measure that prevents the nut from being accidentally loosened. A lock nut, i.e. a second nut that secures an existing connection at the same height, is conceivable as a safety feature. Other options are castle nuts in combination with a (safety) split pin, self-locking nuts with a plastic or solid metal clamping part or the palm nut.
Material and strength of screw nuts
The largest class of screw nuts is made of bright steel with variable strength (steel class 4, 5 or 8 or high-strength nuts of class 10 and 12). A side note: unlike screws (e.g. strength class 8.8), the second part is missing when specifying nuts. Due to their design, screw nuts only have the tensile strength specified and not the lower yield strength, which comes after the dot.
Corrosion and rust protection
Rust is a big problem with nuts. Water, whether through direct contact or the water content in oxygen, causes rust if the screw nut is not protected from the weather by corrosion protection or if it is not made of a special steel - stainless steel. Stainless steels are usually A1 and A2. However, they only offer limited rust protection, while highly acid-resistant steels such as A4 and A5 are also resistant to acids or salt water. The far larger class of nuts, however, are made of bright steel with variable strength. These are usually bright, i.e. untreated, and rust 'immediately'. The most common treatment is electrogalvanization, but hot-dip galvanization, burnishing, phosphating or chromating are also common processes that protect against rust.
Special types of nuts
Other nuts are cage nuts, as used in 19-inch racks, or nuts for furniture (e.g. set nuts, sleeve nuts, knock-in nuts or screw-in nuts). To connect other components with the help of a nut, ring nuts, chip lock nuts or T-slot nuts are used.