Balance Shaft Bolt 99014520800 Sinotruk

Product Introduction

Structure

This balance shaft bolt is a high-strength one-piece forged fastener designed for heavy-duty truck balance shaft systems. It features a long, slender shank with a precision-threaded section on one end and a cylindrical locating base on the other. A hexagonal head nut is pre-installed on the threaded end for secure clamping. The entire component is finished with a black oxide or phosphate coating, providing excellent corrosion resistance and wear protection.

Performance

Forged from premium alloy steel (such as 42CrMo) and subjected to quenching and tempering heat treatment, this bolt achieves a tensile strength grade of 10.9 or higher, with exceptional fatigue resistance and impact toughness to withstand extreme alternating loads. The black anti-corrosion finish provides superior resistance to rust, salt spray, and chemical exposure, ensuring long-term durability in harsh operating environments. It maintains stable clamping force in temperatures ranging from -40°C to 150°C, and the precision threads prevent loosening under prolonged vehicle vibration, ensuring reliable performance in heavy-duty conditions.

Core Function

1. Serves as the core fastening component for the balance shaft assembly, rigidly connecting the balance shaft, leaf spring, and axle bracket to ensure the integrity of the suspension system.

2. Transmits and bears complex loads such as vertical pressure, lateral torque, and longitudinal impact during vehicle operation, maintaining the precise positional relationship of the balance shaft.

3. Prevents relative displacement between the balance shaft and related components under dynamic conditions such as vehicle acceleration, braking, and turning, avoiding abnormal wear of suspension parts.