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Wholesale 8.8 grade galvanized carbon steel hexagonal screws high strength extended half thread bolts

8.8 grade galvanized carbon steel hexagonal screws high strength extended half thread bolts 8.8 grade galvanized carbon steel hexagonal screws high strength extended half thread bolts
  • 8.8 grade galvanized carbon steel hexagonal screws high strength extended half thread bolts
  • 8.8 grade galvanized carbon steel hexagonal screws high strength extended half thread bolts
Carbon Steel Fasteners

8.8 grade galvanized carbon steel hexagonal screws high strength extended half thread bolts

Product Advantages: Its core strength stems from the perfect combination of material (carbon steel), construction (half-thread), and head shape (external hexagon). The diameter of the bolt's smooth shank (unthreaded portion) is essentially the same as the nominal diameter of the thread, meaning it's not "weakened." The thread root is a weak point where stress concentrates. When subjected to transverse shear and alternating loads, the smooth shank distributes the load more evenly, avoiding stress concentration at the thread root, significantly improving shear resistance and fatigue life.

Product Selling Point: When your connection point is subject to lateral forces or vibration, the smooth shank of our half-thread bolts offers far superior shear strength and fatigue resistance than fully threaded bolts, fundamentally improving connection reliability. Not only is it sturdy, but the smooth shank also acts as a locating pin, ensuring quick and precise alignment of components during assembly, improving product quality and assembly efficiency. We comply with international standards and offer a comprehensive range of specifications for immediate availability.

Product Applications: 1. Building steel structures: beam-column connections, hinge points (exposed to shear forces).
2. Heavy Machinery: Mining machinery, agricultural machinery, press bases (withstand vibration and shock).
3. Automotive Industry: Chassis suspension, wheel connections, engine mounts (require high strength and fatigue resistance).
4. Precision Equipment and Molds: Equipment frames, mold positioning (require precise alignment).
5. Rail Transit: Rail vehicles, signaling equipment (require high reliability and corrosion resistance).

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  • Common Standard: GB/T 5782
    Note: Different standards have slight differences in dimensions and tolerances.
    Strength Grade: 4.8, 8.8
    Note: Grade 8.8 is very common; higher grades indicate higher bolt strength.
    Thread Characteristics: Half-thread (partial thread)
    Note: The diameter of the polished rod is close to the nominal thread diameter, providing better resistance to shear forces. The threaded portion is used for tightening.
    Dimensions: Nominal Diameter (d): From M1.6 to M39, and even larger (common examples include M6, M8, M10, M12, M16, M20, M24, and M30). Length (L): Available in a variety of sizes, this refers to the combined length of the polished rod and threaded portion (excluding head height).
    Note: The appropriate length should be selected based on the thickness of the connector and the height of the nut. Generally, one to two threads of the nut should be visible after tightening.
    Material and Finish: Material: Carbon steel. Processing: Typically manufactured by cold heading and thread rolling. Grades 8.8 and above require heat treatment.

    Note: Carbon steel is heat treated to achieve the required strength.



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Jiaxing Lanyue Metal Technology Co., Ltd.

About Us

Jiaxing Lanyue Metal Technology Co., Ltd. is China 8.8 grade galvanized carbon steel hexagonal screws high strength extended half thread bolts Factory, Manufacturers and Wholesale 8.8 grade galvanized carbon steel hexagonal screws high strength extended half thread bolts Company. It is a leading enterprise based in Jiaxing, Zhejiang, a core manufacturing region in the Yangtze River Delta. We specialize in the research, development, production, and sales of precision metal and engineering plastic products. Driven by innovation, we have established and implemented a comprehensive ISO 9001 quality management system, committed to providing diversified, high-quality component solutions to industrial customers worldwide.

Lanyue Metal Technology consistently adheres to the philosophy of "Striving for Excellence, Innovating for the Future," elevating manufacturing capabilities through technological innovation and earning customer trust with superior quality. We strive to become a leading supplier in the precision manufacturing of metals and plastics, working hand in hand with our partners to create shared value.

Honor

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    Quality Management System Certification
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    Certificate of Quality Management System Certification

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Industry knowledge

Industry Insights on 8.8 Grade Galvanized Carbon Steel Hexagonal Screws

8.8 Grade galvanized carbon steel hexagonal screws, also known as high strength extended half thread bolts, play an essential role in machinery manufacturing, equipment installation, steel structures, automotive engineering and many other industrial applications. As industrial systems move toward higher load capacity, longer service life and enhanced safety, the demand for high strength fasteners continues to increase.

As a professional manufacturer, Jiaxing Lanyue Metal Technology Co., Ltd. provides stable, precise and durable high strength carbon steel fasteners to global industrial customers. Located in Jiaxing, Zhejiang, a major manufacturing region in the Yangtze River Delta, the company operates under a comprehensive ISO 9001 quality management system and focuses on innovation driven metal and plastic precision manufacturing.

Main Features of 8.8 Grade Galvanized Carbon Steel Hexagonal Screws

High Strength Performance

Grade 8.8 screws are produced from medium carbon steel and heat treated to achieve strong mechanical properties. Their key performance characteristics include:

  • Tensile strength: 800 MPa
  • Yield strength: not less than 640 MPa
  • Suitable for applications with heavy load, vibration or impact

Compared with lower strength levels such as 4.8 or 6.8, grade 8.8 screws are ideal for critical components and heavy duty working conditions.

Enhanced Corrosion Resistance with Zinc Plating

The zinc coating forms an oxidation resistant protective layer, providing excellent corrosion resistance. This treatment is suitable for outdoor equipment, humid environments and areas with mild chemical exposure. It effectively extends the service life of components and reduces maintenance costs.

Hexagon Head Structure

The hexagonal head design provides better installation and tightening performance. It supports the use of manual tools and power tools, ensuring stable torque transmission. This structure is particularly useful in limited installation spaces that require strong fastening strength.

Extended Half Thread Design

The extended half thread structure offers improved shear strength due to the unthreaded section. It also increases the contact surface between components, enhancing overall stability. This makes it suitable for equipment frames, heavy machinery and precision assembly applications.

Typical Application Industries

Industry Application Advantages
Machinery Manufacturing Motors, frames, component mounting High load support and vibration resistance
Steel Structure Engineering Bridges, building frames Stable strength and outdoor adaptability
Automotive Industry Chassis, frames, suspension systems Impact resistance and long service life
Industrial Equipment Mounting and support structures Easy installation and strong load capacity
New Energy Equipment Wind power devices, photovoltaic supports Corrosion resistance and secure fastening

Why Choose Lanyue Metal Technology

As a leading manufacturer, Jiaxing Lanyue Metal Technology Co., Ltd. offers complete production capabilities from raw material control to tooling development and final inspection.

  • ISO 9001 quality management system ensuring stable product standards
  • Advanced cold heading and heat treatment processes
  • OEM support and customized production according to DIN, ISO and GB standards
  • Fast delivery supported by the strong supply chain of Jiaxing fastener industry

Sample Product Specifications

Specification Type Available Options
Material Carbon steel such as C35 or C45
Strength Grade 8.8
Surface Treatment Zinc plated, hot dip galvanized, dacromet, black oxide
Length Range 20mm to 300mm or customized
Thread Type Half thread or full thread
Standards DIN 931, DIN 933, ISO 4014, ISO 4017

Frequently Asked Questions

Is an 8.8 grade galvanized screw suitable for outdoor use

Yes. The zinc coating provides effective protection against moisture and oxidation, making it suitable for general outdoor applications. For environments with high corrosion levels, hot dip galvanizing or dacromet coating is recommended.

What is the difference between half thread and full thread bolts

Half thread bolts offer higher shear strength and better positioning for structural assembly, while full thread bolts provide flexible adjustment and better fastening for components requiring fine positioning.

Can the company provide OEM or customized services

Yes. The company supports drawing based manufacturing, customized materials, customized coating options and large scale production.

How do you ensure stable quality

The company uses an ISO 9001 quality management system, automatic inspection equipment, metallographic analysis, salt spray testing and tensile strength testing to ensure consistent quality.

Are samples available

Yes, samples can be provided for testing before mass production.

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