Flange Surface Galvanized Hub Bolts

Product introduction

This product is a typical customized non-standard screw. The head adopts flange surface or spherical surface design to increase the contact area and disperse pressure. It is a typical application of special head screws in the field of automotive parts fasteners. The product is made of alloy steel (SCM435/40Cr). It has been heat treated to reach 10.9/12.9 high strength. The surface is galvanized to prevent rust and look beautiful. As a non-standard fastener, its precision thread and anti-loosening design ensure driving safety, and it is widely used in wheel hub connections of passenger cars, commercial vehicles and engineering machinery. We specialize in customizing special-shaped fastener parts. The head shape, strength, and surface treatment can be customized according to the drawings. Supports small batch samples and large batch supply, welcome to inquire about drawings.

 

Product features

Flange surface/spherical head design: The head adopts flange surface or spherical structure to increase the contact area with the hub, disperse pressure, and prevent hub hole deformation; the spherical surface design can automatically center to ensure installation concentricity;

High strength level: usually requires level 10.9 or level 12.9 high strength to meet the strict requirements for load-bearing capacity and fatigue resistance of automobile wheel hub connections;

Precision thread: Thread accuracy is strictly controlled to ensure matching accuracy with the hub nut and prevent loosening;

Galvanized surface treatment: The electro-galvanizing process is used to provide good anti-rust ability and a uniform and bright appearance. Blue and white zinc, yellow zinc, black zinc, etc. can be selected according to needs;

Anti-loosening performance: It can be used with anti-loosening washers or pre-coated anti-loosening glue to further enhance the ability to resist vibration and prevent loosening.

 

Materials and application fields

Alloy steel (40Cr, 35CrMo, 42CrMo, SCM435, SCM440, etc.): It has excellent comprehensive mechanical properties and can reach grade 10.9 or grade 12.9 strength requirements after heat treatment. It is the first choice material for manufacturing automotive parts fasteners;

Carbon steel (10B21, 35K, etc.): suitable for grade 8.8 wheel hub bolts, mostly used in light vehicles or non-load-bearing parts;

Surface treatment: galvanized (blue and white zinc, yellow zinc, black zinc), can be treated with sealant, salt spray test can reach 72-120 hours.

 

Application areas:

Passenger wheel hub: the connection between the wheel hub and the wheel axle of cars, SUVs, MPVs and other models;

Commercial wheel hubs: wheel hub fastening for trucks, buses, trucks and other heavy vehicles;

Engineering machinery: wheel fixing of excavators, loaders and other engineering machinery;

Agricultural machinery: hub connections for tractors, harvesters and other agricultural equipment;

New energy vehicles: Wheel hub bolts for electric vehicles and hybrid vehicles need to meet the dual requirements of lightweight and high strength;

Modified car market: personalized hub bolts for modified vehicles such as racing cars and off-road vehicles.

 

Quality control and certification system

Raw material control: All alloy steel materials come with material certificates, and the composition is verified by a spectrum analyzer to ensure compliance with SCM435, 40Cr and other brand standards;

Heat treatment control: A continuous mesh belt furnace is used for quenching + tempering treatment, and the temperature and time are strictly controlled to ensure that the hardness and tensile strength meet the requirements of level 10.9 or level 12.9;

Dimensional accuracy control: Key dimensions (flange surface diameter, head height, thread specifications, thread length, total length) are fully inspected or AQL sampled using professional measuring tools such as image measuring instruments and thread gauges;

 

Mechanical property testing:

Tensile strength test: verify the load-bearing capacity of the bolt;

Yield strength test: ensure plastic deformation performance;

Hardness test (HRC/HV): Check the heat treatment effect;

Impact toughness test: verify low temperature impact resistance;

Torque test: Carry out guaranteed load test and torque-clamping force test to ensure the corresponding relationship between installation torque and clamping force;

Metallographic inspection: Check the depth of the hardened layer and microstructure to avoid overheating or decarburization defects;

Galvanizing quality control: film thickness detection, adhesion test, salt spray test (72–120 hours);

System certification: The company has passed ISO 9001 quality management system certification and IATF 16949 automotive industry quality management system certification, ensuring that each batch of non-standard fasteners has complete traceability and meets the strict requirements of the automotive industry.

 

Customized services

Size customization: Thread specifications (metric M10-M24, English, American), thread length, flange surface diameter, head height, and total length can all be customized according to customer drawings or samples;

Head type customization: As special head screws, special head types such as flange head, spherical head, cone head, gasket head, T-shaped head, etc. can be customized;

 

Head structure customization:

Flange surface with teeth: enhance anti-loosening performance;

Spherical tapered: adapted to different hub hole angles;

With guide head: easy to install and align the holes;

Strength level customization: different performance levels such as 8.8, 10.9, and 12.9 are available;

Customization of thread form: coarse thread, fine thread, rolling thread, cutting thread, etc. can be designed;

Surface treatment customization: blue and white zinc, yellow zinc, black zinc, Dacromet, zinc-nickel alloy, Jiumeite, etc.;

Customized anti-loosening solution: can be combined with pre-coated anti-loosening glue, anti-loosening washers, non-standard threads, etc.;

Packaging method: Bulk, bagged, pallet packaging, and customized labels can be provided to meet the assembly line needs of the OEM.

 

FAQ

Q: What is the difference between hub bolts and ordinary bolts?

A: Wheel hub bolts are specially used to connect automobile hubs. The heads are designed with flange surface or spherical surface to increase the contact area and disperse pressure; the strength level is required to be higher (usually 10.9 or 12.9). Ordinary bolts have no special head design and have a lower strength level. Therefore, hub bolts are automotive parts fasteners and are typical representatives of special head screws.

 

Q: Why do wheel hub bolts need high strength grade?

A: The wheel hub bolts bear alternating loads, impact loads and shear forces during vehicle driving. If the strength is insufficient, the bolts may break or loosen, causing serious safety accidents. High strength levels of 10.9 and above ensure driving safety.

 

Q: Is this bolt a standard part?

A: Although there are some standard specifications of wheel hub bolts (such as DIN and JIS standards), wheel hub bolts of different models have differences in head angle, flange surface size, thread specifications, etc. In practical applications, most of them are non-standard fasteners and need to be customized and produced according to the specific requirements of customers.

 

Q: As a customized non-standard screw, what is the minimum order quantity?

A: The minimum order quantity depends on the complexity of the product and the production process. When using the cold heading molding process, it is recommended that the minimum order is 10,000-50,000 pieces; when using CNC processing, small batch customization of several hundred pieces can be supported. For automotive parts fasteners, mass production is usually recommended to reduce costs.

 

Q: Can wheel hub bolts be reused?

A: For safety reasons, it is recommended to replace new bolts after each tire replacement or wheel hub removal. Because after multiple tightenings, the bolts may undergo plastic deformation or fatigue damage, affecting safety.

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