Carbon Steel Grade 12.9 Black Oxide Wheel Bolt Wheel Metal Bolt M6 M8
1,Description:
12.9 grade screws usually refer to ultra-high-strength screws made of SCM435 alloy steel, with a minimum tensile strength of 1220Mpa and a hardness of 39 to 44HRC. It is mainly used in the domestic textile, hydraulic, injection molding and mechanical industries.
Black oxidation treatment is a common method of chemical surface treatment. The principle is to form an oxide film on the metal surface to isolate it from the air and achieve the purpose of rust prevention. When the appearance requirements are not strict, blackening treatment can be adopted. The surface blackening treatment of steel parts is also called bluing. Black oxidation treatment can eliminate reflections and is a surface coating treatment method commonly used for military knives.
Flange bolt is composed of hexagonal head and flange, its "support area and stress area word ratio" is greater than ordinary bolts, so this bolt can withstand higher preload, anti-loose performance is also better, so it is widely used in automotive engines, heavy machinery and other products. The flange bolt is a bolt composed of two parts: a hexagon head and a flange (the gasket under the hexagon and the hexagon are fixed into one) and a screw (a cylinder with external threads)
2,Applications:
Hub bolts are high-strength bolts that connect the wheels of a vehicle. The connection position is the hub unit bearing of the wheel! Generally, 10.9 grade is used for mini cars, while 12.9 grade is used for medium and large vehicles! The structure of hub bolts is generally composed of knurled spline gears and threaded gears! And a hat head! Most T-shaped head wheel hub bolts are of grade 8.8 or above, and they are responsible for the large torque connection between the car wheel hub and the axle! Most double-ended wheel hub bolts are of grade 4.8 or above, and they are responsible for the connection between the outer wheel hub housing and the tires of the vehicle with relatively light torque.
| Applications |
| car | In high-strength applications such as automotive engines, heavy-duty machinery, and bridge construction, they are preferred for their larger support area and better anti-loosening performance. |
| mechanical | Mechanical, electronic, automotive, construction and other fields, used to connect various mechanical parts, circuit boards, engines, transmissions, building structures, etc |
| energy | For the energy industry, brackets and fixtures used to connect power generation equipment and transmission lines
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| architectural | In the field of construction engineering, shipbuilding, and petrochemical industry, it is used to connect building structures, improve the navigation safety and stability of ships, and ensure the safety and stability of petrochemical equipment |
3,Specifications:
| material |
| aluminium | Aluminum has excellent thermal and electrical conductivity. However, aluminum is naturally soft and may produce gelatinous buildup after processing. If not properly operated, it is difficult to cut during processing. |
| titanium | Edm machining is well suited for titanium because the process can withstand the viscosity of this alloy and break down lengthy chips. However, deionized water is needed as a medium to help control the heat generated during processing.
|
| steel | Steel is a very strong metal, and many manufacturers tend to use wire cutting machines instead of CNC machines for machining complex steel features. However, this material generates a lot of heat, so necessary precautions need to be taken. |
| brass | Brass has a high tensile strength and is easy to cut by machine. But the cutting speed should be slow because it is a soft metal. |
4,Feature Advantage:
Ordinary bolt head is very thick, difficult to deform, if vibration occurs after good, but also need to re-tighten; The flange with a thin part, can be slightly deformed, can be locked more firmly. There is also the fact that if it goes to the hole, the ordinary bolt can not use the tool, the head of the flange bolt is smaller, the following flange plate also plays a fastening role, but it can be used on the special tool to the hole, and the hexagonal bolt is about the same principle. Another is the flange top flat pad to use, in the softer, non-wear-resistant material is safer, will not cause perforation
The screws on the wheel hub (commonly known as wheel hub nuts) play a crucial role. They not only ensure a stable connection between the wheels and the vehicle, but are also directly related to the safety of driving. Without these nuts, even the most expensive luxury cars cannot drive safely on the road. For friends who are familiar with cars, they may find that the number of wheel hub nuts varies among different models. Some large vehicles or heavy-duty trucks may have as many as seven, eight or even more hub nuts, while some small vehicles may have only four.
5,About us
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Carbon Steel Grade 12.9 Black Oxide Wheel Bolt Wheel Metal Bolt M6 M8 Images
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