Hub bolts are high-strength bolts that connect vehicles to the wheels. The connection location is the hub unit bearing of the wheel! Generally, class 10.9 is used for mini-medium vehicles, class 12.9 is used for large-sized vehicles! The structure of the hub bolt is generally a knurled key file and a threaded file! And a hat head! Most of the T-shaped head wheel bolts are above 8.8 grade, which bears the large torsion connection between the car wheel and the axle! Most of the double-headed wheel bolts are above grade 4.8, which bear the lighter torsion connection between the outer wheel hub shell and the tire.
1. Selection of high-strength bolt raw materials
The correct selection of fastener materials in fastener manufacturing is an important part, because the performance of fasteners is closely related to its material. Cold heading steel is a steel for fasteners with high interchangeability produced by cold heading forming process. Because it is formed by metal plastic processing at room temperature, the deformation amount of each part is large, and the deformation speed is also high. Therefore, the performance requirements of cold heading steel raw materials are very strict.
(1) If the carbon content is too high, the cold forming performance will be reduced, and if the carbon content is too low, it will not be able to meet the requirements of the mechanical properties of the parts.
(2) Manganese can improve the permeability of steel, but adding too much will strengthen the matrix structure and affect the cold forming performance.
(3) Silicon can strengthen ferrite to reduce cold forming properties and material elongation.
(4) Although boron element has the effect of significantly improving the permeability of steel, it will also lead to an increase in the brittleness of steel. Excessive boron content is very unfavorable for workpieces such as bolts, screws and studs that require good comprehensive mechanical properties.
(5) Other impurity elements, their existence will cause segregation along the grain boundary, resulting in the embrittlement of the grain boundary, and the damage to the mechanical properties of the steel should be reduced as much as possible.
| hardness | 36-38HRC |
| tensile strength | ≥ 1140MPa |
| Ultimate Tensile Load | ≥ 346000N |
| Chemical Composition | C:0.37-0.44 Si:0.17-0.37 Mn:0.50-0.80 Cr:0.80-1.10 |
| hardness | 39-42HRC |
| tensile strength | ≥ 1320MPa |
| Ultimate Tensile Load | ≥406000N |
| Chemical Composition | C:0.32-0.40 Si:0.17-0.37 Mn:0.40-0.70 Cr:0.15-0.25 |
Q1: How many people in your company?
More than 200 people.
Q2: What else products you can make without wheel bolt?
Almost all kinds of truck parts we can make for you. Brake pads, center bolt, U bolt, steel plate pin, Truck Parts Repair Kits, casting, bearing and so on.
Q3: Do you have an International Certificate of Qualification?
Our company has obtained the 16949 quality inspection certificate, passed international quality management system certification and always adhere to automotive standards of GB/T3098.1-2000.
Q4: Can products be made to order?
Welcome to send drawings or samples to order.
Q5: How much space does your factory occupy?
It’s 23310 square meters.
Q6: What is the contact information?
Wechat, whatsapp, E-mail, mobile phone, Alibaba, website.
Q7: What kind of materials are there?
40Cr 10.9,35CrMo 12.9.