Wheel hub bolts are high-strength bolts that connect vehicle wheels. The connection position is the hub unit bearing of the wheel! Generally, mini-cars use grade 10.9, and large and medium-sized vehicles use grade 12.9! The structure of the wheel hub bolts is generally knurled key files and threaded files! And a cap head! T-shaped head wheel hub Most of the bolts are grade 8.8 or above, responsible for the high-torque connection between the car wheel hub and the axle! Most of the double-headed wheel hub bolts are grade 4.8 or above, responsible for the light-torque connection between the car's outer hub shell and the tire.
Product introduction
Product name: hub bolt
Pinyin: LUN GU LUO SHUAN
Alias: tire screws, car pan wire, wheel hub wire, etc.
Grade:4.8 8.8 10.9 12.9
Common shapes: T-bolts on the head, stud bolts with pads in the middle
Surface treatment: environmentally friendly blue and white galvanizing, colorful galvanizing
Mode of action: Matched with wheel hub nut to fix vehicle wheel hub
Wheel hub bolts are high-strength bolts that connect vehicle wheels. The connection point is the hub unit bearing of the wheel. Generally, mini-vehicles use grade 10.9, and large and medium-sized vehicles use grade 12.9. The structure of wheel hub bolts is generally knurled key files, threaded files, and a cap head. Most T-head hub bolts are grade 8.8 or above, responsible for the large torque connection between the car wheel hub and the axle! Double-headed wheel hub bolts are mostly grade 4.8 or above, responsible for the lighter torque between the car's outer hub shell and the tire. connect.
Wheel hub bolt technical requirements
1. Wheel hub bolts, wheel screws and nuts shall comply with the requirements of this standard and be manufactured in accordance with product drawings and technical documents approved through prescribed procedures.
2. The wheel hub bolts and wheel screws should be made of 45 steel or 4OCr, 35crMoA, 40MnB, 40MnVB alloy steel. Other materials with physical properties not lower than the above materials can also be used.
3. The material of wheel nuts should be 35 steel, 40 steel, etc. or 40NnB alloy steel. Other materials with physical properties not lower than those mentioned above can also be used.
other materials.
4. After heat treatment, the performance level of wheel hub bolts and wheel screws should be no less than 8.8, and the hardness value should comply with the regulations of GB/T3098.1
The hardness difference on the same bolt or screw should not be greater than SHRCa.
5. After heat treatment, the performance level of wheel nuts should be no less than level 8, and the hardness value should comply with the requirements of GB/T3098.4. The same nut
The hardness difference on the motherboard should not be greater than SHRC.
6. The depth of the decarburization layer should be less than or equal to 0.015mm
7. The basic thread dimensions of wheel hub bolts, wheel screws and nuts should comply with the provisions of GB/T196.
8. The thread tolerances of wheel hub bolts, wheel screws and nuts should comply with the regulations of CB/T197.
9. The shape and position tolerances of wheel hub bolts, wheel screws and nuts should comply with the regulations of GB/T31031.
10. The diameter tolerance of the fitting part between the wheel hub bolt screw and the wheel hub is level 8.
11. The circular runout of the wheel screw support facing the thread axis should not be greater than 0.2mm, and the circular runout of the wheel nut support facing the thread axis should not be greater than 25mm.
This standard specifies the technical requirements, testing methods, inspection rules, marking, packaging, transportation and storage of wheel hub bolts, wheel screws and nuts for wheeled tractors.
This standard applies to wheel hub bolts, wheel screws and nuts (hereinafter referred to as wheel hub bolts, wheel screws and nuts) for wheeled tractors.
Wheel hub bolts, wheel screws and nuts used in transportation machinery and other wheeled agricultural machinery can also be used as a reference.
Hub bolts, materials are 35#, 45#, 60#, 16Mn, 65Mn, 40Cr, 20MnTiB, 35CrMo, 42CrMo optional, thread specifications M10~M48, 3/8″~2″, screw length 20~1000(mm ).
