Galvanized Carbon Steel M8-M14 Hexagon Bolt

Galvanized Carbon Steel M8-M14 Hexagon Bolt is a commonly used motorcycle fastener product offered by Max Trading, a China-based manufacturer and supplier of motorcycle fasteners.  Made from high-quality carbon steel and treated with a galvanized protective coating, these bolts offer a balance of basic strength, corrosion resistance, and cost-effectiveness. They are suitable for various non-critical load-bearing parts of motorcycles, such as frame attachments, seat brackets, fenders, and exhaust systems. This product series covers specifications from M8 to M14, facilitating vehicle assembly and subsequent maintenance.

Product Details

I. Basic Materials and Strength Characteristics: Meeting the Regular Stress Requirements of Motorcycles

Stable Carbon Steel Substrate

The Galvanized Carbon Steel M8-M14 Hexagon Bolt offered by Max Trading use high-quality carbon steel as the base material.  Through mature cold heading and heat treatment processes, a balance is achieved between rigidity and toughness.

During the long-term operation of a motorcycle, the bolts need to withstand both continuous vibration and intermittent loads. This carbon steel structure effectively reduces the risk of fracture due to material embrittlement, providing stable support for frame connections and accessory fixings.

Precisely Matched 4.8 Grade Strength

The product is manufactured strictly according to the GB/T 3098.1 standard, with a strength grade of 4.8:

Tensile strength ≥ 400 MPa

Yield strength ≥ 320 MPa

As a medium-strength bolt, this grade is ideal for fastening needs in non-critical parts of motorcycles, such as fenders, seat brackets, fairings, and decorative parts. While ensuring reliable connections, it avoids unnecessary costs associated with using excessively high-strength bolts, achieving a reasonable balance between performance and economy.

II. Specifications and Size Compatibility: Covering Multiple Installation Needs

Full Range of M8–M14 Specifications

The Galvanized Carbon Steel M8-M14 Hexagon Bolt offers a complete range of specifications, suitable for motorcycle components with different load levels:

M8 / M10: Commonly used for instrument panel fixing, side stand connection, and small bracket installation

M12 / M14: Suitable for rear fork brackets, exhaust pipe fixing, and other medium-load structures

The unified specification system reduces the need for frequent tool changes during maintenance, improving installation and maintenance efficiency.

Practical Advantages of the External Hexagon Structure

The external hexagon head is compatible with open-end wrenches, combination wrenches, and socket tools, making it especially suitable for disassembly and assembly in confined spaces on motorcycles (such as between the engine side cover and the frame).

Compared to internal hexagon structures, external hexagons require less tool precision, reducing the risk of slippage and making them more suitable for real-world repair environments. 

III. Galvanized Protection Treatment: Addressing the Complex Operating Environment of Motorcycles

Multi-layer Anti-corrosion Protection System

Max Trading utilizes an electro-galvanizing + passivation treatment process (hot-dip galvanizing is also available upon request), forming a dense zinc layer of ≥8μm on the bolt surface, effectively resisting:

Corrosion from rainwater and humid environments

Erosion from mud and sand

Contamination from engine oil and fuel

Significantly extending the service life of bolts during outdoor riding and long-term use.

Practicality and Aesthetics Combined

The uniform silver-gray galvanized layer not only enhances overall appearance consistency but also possesses "sacrificial anode protection" characteristics. Even if slight scratches occur on the surface, the zinc layer will preferentially oxidize, continuously protecting the carbon steel substrate and delaying the corrosion process.

Product Parameter:

IV. Max Trading's Differentiated Solutions for Different Application Environments

As an experienced Motorcycle Bolt Factory in China, Max Trading provides customized surface treatment solutions based on actual operating conditions:

High-temperature areas (such as exhaust systems)

Using ceramic coating or Dacromet process, the temperature resistance can reach over 600℃, and the salt spray test pass rate is increased by approximately 30% compared to conventional treatments, effectively resisting high-temperature oxidation.

High-humidity areas (such as wheel hubs and chassis)

Using hot-dip galvanizing + passivation process, the zinc layer thickness is ≥85μm, and the corrosion resistance is 2-3 times higher than ordinary electroplating, suitable for long-term outdoor use.

Parts with high appearance requirements

Through electrophoretic coating process, the coating uniformity error is controlled to ≤5%, and the adhesion reaches Class 1 standard, ensuring both durability and visual consistency with the entire vehicle.

V. Max Trading's Production and Quality Control

Max Trading has a complete fastener production equipment system, from raw material inspection, cold heading, thread processing to surface treatment, all completed in-house.

Each batch of Galvanized Carbon Steel M8-M14 Hexagon Bolt undergoes dimensional, strength, and surface quality testing to ensure stable performance during assembly and long-term use, meeting the needs of bulk purchasing and long-term cooperation.

How max trading’s products produced