10.9 Grade 40Cr Hub Bolts for Heavy-Duty Use

The main functions of Hub bolt include fixing hub, supporting tire, buffering external impact, transferring body weight, bearing lateral load, driving force and braking force torque when turning, so as to ensure vehicle performance ‌‌12.

Hub bolt fix the wheel on the hub through the combination of nuts and washers to ensure the stability and safety of the wheel during the driving process. In addition, the hub bolts also bear the torque transmission from the gearbox, and are subjected to the double action of tensile and shear forces at work ‌

Advantages of Hub Bolts Wholesaled by Tianlong

1. Tianlong's wholesaled hub bolts are made of alloy materials with excellent strength

The hub bolts OEM-manufactured by Tianlong are made of 40Cr alloy steel, which is an excellent high-strength alloy material. Combined with the 10.9 high strength grade, its tensile strength can reach 800-1000MPa, far exceeding that of ordinary carbon steel bolts.

2. Offering a wide range of bolt specifications

The hub bolts OEM-manufactured by Tianlong have a very rich variety of thread sizes. The product covers various thread models such as M12-M24, which can be used for component connection of wheel hubs of various vehicle models.

In addition, according to production needs, we provide three options for surface treatment processes: Plain, Black, and Hot-Dip Galvanized (HDG).

Surface Treatment Process	Corrosion Resistance	Aesthetic Appearance	Wear Resistance	Typical Application Scenarios	Cost
Plain (Uncoated)	Basic (susceptible to rust in humid environments)	Natural metal finish, matte	Moderate (depends on base material)	Indoor machinery, dry environments, temporary fastening	Lowest
Black (Black Oxide)	Improved (resists light corrosion; better with oil coating)	Uniform black finish, sleek	Enhanced (hardened surface layer)	Automotive undercarriage, general industrial use, aesthetic requirements	Moderate
Hot-Dip Galvanized (HDG)	Excellent (thick zinc layer provides long-term protection against harsh elements)	Bright silver-gray, glossy	High (zinc layer adds durability)	Outdoor/heavy-duty use (e.g., trucks, construction vehicles), coastal or high-moisture areas	Highest

3. High quality with excellent durability

The 40Cr material selected for Tianlong's hub bolts, after undergoing internationally leading heat treatment, achieves a perfect balance between toughness and wear resistance, and its comprehensive performance ranks among the world's top levels.