High Strength Shock Absorber Bolt

The High Strength Shock Absorber Bolt from XIAYI is designed for automotive shock absorber brackets, MacPherson struts, rear axles, control arms and other suspension connection positions. Its integrated flange structure provides a larger bearing surface and reduces the need for separate washers, helping simplify assembly operations.

Manufactured from high-quality alloy steel and processed through controlled heat treatment, the bolt is designed to maintain stable mechanical performance under repeated vibration and load changes. Precision thread rolling and inspection help improve compatibility with automated assembly equipment while reducing thread-related assembly problems.

Production Control

Raw Material Inspection

Raw materials are inspected before production to control material quality and reduce the risk of internal defects. XIAYI uses alloy steel grades selected according to different load requirements, with corresponding material verification and production traceability.

Integrated Cold Forging

The bolt head and flange are formed through a multi-station cold forging process. This integrated manufacturing method helps improve structural consistency and reduce potential defects around the flange connection area.

Vacuum Heat Treatment

Vacuum quenching and tempering are used to achieve the mechanical properties required for Grade 10.9 applications. Hardness and tensile performance are inspected by batch to help maintain consistent strength and toughness.

Precision Thread Rolling

Threads are produced through controlled rolling and inspected using go/no-go gauges. This process helps ensure reliable thread engagement and supports compatibility with automatic tightening equipment.

Corrosion Protection

The bolt uses a multi-layer electro-galvanizing and sealing process for underbody corrosion resistance. The High Strength Shock Absorber Bolt can achieve 500-hour neutral salt spray resistance, supporting use in humid, muddy and winter road environments.

Material and Specification Options

Different specifications can be matched with different shock absorber structures and vehicle load requirements.

For higher-load applications, Grade 10.9 bolts manufactured from 40Cr alloy steel provide tensile strength of ≥1040MPa and yield strength of ≥940MPa.

Key Performance Standards

Dimensional Accuracy

XIAYI controls key dimensional parameters to support stable installation and assembly consistency. Standard metric threads are inspected using go/no-go gauges, while shaft straightness, length and flange dimensions are controlled according to product specifications.

Mechanical Strength

The High Strength Shock Absorber Bolt is designed to withstand alternating vibration and suspension loads. Typical Grade 10.9 products maintain a surface hardness range of 32--38HRC, tensile strength of ≥1040MPa and yield strength of ≥940MPa.

Corrosion Resistance

The three-layer surface protection system is designed for automotive underbody conditions. After corrosion testing, the product can provide up to 500 hours of neutral salt spray resistance, helping reduce rust and thread seizure during long-term service.

Core Advantages

The integrated flange structure simplifies assembly by reducing the need for separate washers and provides a wider bearing surface for load distribution.

Grade 10.9 mechanical performance helps the bolt resist stretching, thread damage and fracture under repeated suspension vibration.

The precision thread rolling process supports stable installation and reduces the risk of automatic assembly interruptions caused by thread defects.

Multi-layer corrosion protection improves durability in environments exposed to moisture, mud and de-icing salt.

Batch inspection and production traceability help maintain consistent quality for OEM and large-volume procurement.

Common Procurement Problems

Bolt Loosening Under Vibration

Long-term suspension movement can place repeated alternating loads on fastening components. High-strength alloy steel and controlled heat treatment help improve resistance to deformation and loosening.

Thread Assembly Problems

Poor thread accuracy can cause tightening difficulties or interruptions on automated production lines. Precision thread rolling and inspection help improve assembly compatibility.

Underbody Corrosion

Bolts installed in exposed chassis positions may encounter water, mud and road salt. The corrosion-resistant surface treatment helps reduce premature rusting and thread seizure.

Complex Assembly Steps

Traditional fastening systems may require additional washers and separate installation steps. The integrated flange structure simplifies the assembly process and helps improve production efficiency.

Application Fields & Real Engineering Case

Application Scope

XIAYI High Strength Shock Absorber Bolt is suitable for passenger cars, new energy vehicles, SUVs, light trucks and construction machinery. Typical applications include shock absorber brackets, MacPherson struts, rear suspension assemblies, control arms and hydraulic cylinder connections.

Real Application Case

In 2025, a domestic new energy light truck manufacturer upgraded its chassis shock absorber fasteners with XIAYI Grade 10.9 high-strength shock absorber bolts.

The original bolts experienced assembly jamming, stretching and loosening after approximately 40,000 kilometers of bumpy-road operation, as well as corrosion and thread seizure in winter road conditions.

After the upgrade, the integrated flange structure improved assembly efficiency, while the 1040MPa high-strength alloy steel and vacuum heat treatment improved resistance to deformation and loosening. The three-layer protective coating passed 500-hour salt spray testing, and the manufacturer reported an 86% reduction in after-sales fastener failures.

Frequently Asked Questions

What is the difference between Grade 10.9 and ordinary Grade 8.8 bolts?

Grade 10.9 bolts provide higher tensile and yield strength for applications exposed to greater loads and repeated vibration. XIAYI Grade 10.9 products use alloy steel and controlled heat treatment to support automotive shock absorber and chassis fastening applications.

Can the bolt be used in humid and winter road conditions?

Yes. The three-layer corrosion protection system provides up to 500 hours of neutral salt spray resistance and is designed for environments exposed to moisture, mud and de-icing salt.

Can XIAYI provide customized specifications?

Yes. XIAYI supports customized dimensions, thread specifications, flange structures and other requirements based on customer drawings and application parameters.

Assembly and Selection Support

Assembly Recommendations

The integrated flange structure reduces the need for separate flat or spring washers. During installation, tightening torque should follow the requirements of the corresponding vehicle or equipment design to avoid excessive tightening or thread damage.

For automated assembly applications, matching thread specifications and compatible nuts are recommended to maintain stable tightening performance.

Specification Selection

Bolt selection should consider shock absorber load, connection structure, installation space, vibration conditions and environmental exposure. XIAYI can support technical matching for different vehicle and equipment applications to help customers select suitable specifications.

Custom Application Support

XIAYI can provide customized solutions for different suspension and chassis connection requirements. Available customization may include thread size, bolt length, flange dimensions and other structural parameters.

The High Strength Shock Absorber Bolt can be developed for OEM assembly, aftermarket replacement and specialized equipment applications. Manufacturing and inspection are supported by a quality management system established in accordance with IATF 16949:2016, helping maintain stable requirements from sample verification to batch production.