U bolts 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 Q235, Q345 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.

Because of its special shape, U bolts are easy to identify among bolts. As a commonly used fastener, due to the importance of its effect, it needs to be protected and maintained for a long time during its use. The most important way to protect and maintain is to make U-bolts with anti-oxidation treatment, which is what we usually call anti-rust treatment, galvanized U bolts.

U-bolt is a bolt in the shape of the letter "u", which is a curved bolt with threads on both ends. Since stainless steel A2 A4 U bolt is curved, it fits well in or around pipes. This means that ss304 ss316 U bolt can hold the pipe or tube to the bracket and act as a restraint.

U-bolt is a bolt in the shape of the letter "u", which is a curved bolt with threads on both ends. Since grade 8.8 U bolt is curved, it fits well in or around pipes. This means that galvanized U-bolt can hold the pipe or tube to the bracket and act as a restraint. U bolts can be made of carbon steel, stainless steel, alloy steel or other materials.

Commonly used hex socket head cap bolts are grade 4.8, 8.8, 10.9, 12.9, etc. Usually, the hex socket bolts of grade 8.8 and above are called high-strength Allen bolts, of which the hex socket bolts screws of grade 12.9 have knurling. The hexagon socket head cap bolts below grade 8.8 are called ordinary hex socket bolts.

Galvanized hex socket head cap bolts have good anti-corrosion performance and are mainly used in metal structural facilities in various industries. It is to immerse the rust-removed bolts in a molten zinc solution of about 500 ° C, or use electroplating to attach a zinc layer to the surface of DIN912 hex socket screws, so as to achieve the purpose of anti-corrosion.

DIN912 hexagon socket head cap bolts are also called Allen bolts. Hexagon socket head bolts are widely used in mechanical installations because they are easy to fasten, disassemble, and not easy to slip.

Hex socket head bolts, also known as Allen bolts, cylindrical hex socket head cap screws, hex socket head cap screws, cup head screws. Hexagon socket screws are made of stainless steel, carbon steel, alloy steel and so on.

The strength grade of carriage bolts is selected according to the working pressure. The performance grades of carbon steel carriage bolts are 3.6, 4.6 and 4.8. The standard can refer to GB3098.1, while the material of stainless steel carriage bolts is mainly austenitic stainless steel, which owns good heat resistance, good corrosion resistance and good weldability.

Carriage bolts are divided into large semi-circular head carriage bolts (corresponding to standard GB/T14 and DIN603) and small semi-circular head carriage bolts (corresponding to standard GB/T12-85) according to head size.

Carriage bolts can also be called square neck bolts. They consist of a square neck under a round head, so they are also called square neck bolts. The carriage bolt is composed of head and threaded screw. It needs using in conjunction with nut to fasten and connect two parts with through holes. Another feature of the carriage bolt is that its threaded rod is a cylinder with an external thread.

A carriage bolt consists of mushroom head and screw (with external threads), it needs matching with nut to fasten and connect two parts with through holes. One of the widely used carriage bolts is standard DIN603 with metric M5 to M20 thread.