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Different Types of Bolts

A bolt, also known as a standard component or fastener, refers to a general term that includes ordinary bolts, high-strength bolts, anchor bolts, expansion bolts, chemical anchor bolts, and others. In a broad sense, bolts encompass various types. In a narrow sense, bolts are classified into ordinary bolt connections and high-strength bolts.

Common Bolts mainly divided into rough bolts and refined bolts. According to the production accuracy, it can be divided into three grades: A, B, and C grades. A and B grades are refined bolts, C grades are rough bolts, and connecting bolts for steel structures are generally ordinary rough C grades unless otherwise specified bolt.

High-strength bolts are made of high-strength steel, or bolts that require a large pre-tightening force, can be called high-strength bolts. In addition to its high material strength, high-strength bolts also apply a large pre-tension force to the bolts to generate extrusion force between the connecting components, so that there is a large friction force perpendicular to the direction of the screw. Usually, the surface of the steel is sandblasted (corundum) Or quartz sand) treatment, this method can obtain the maximum anti-slip coefficient, improve the bearing capacity of bolts, and reduce the amount of bolts.

Gmetal Capabilities


Because the material of our Bolts is sturdy and long-lasting. It is well to withstand rain, snow,wind and other environmental factors without deterioring or corroding.


Gmetal Bolts can be customized so it will compatible with the specific requirements of facilities.


Metal is one of the most environmental friendly materials. So the boltm that Gmetal manufacturing is a more eco-friendly and long-term solution.


The bolt of Gmetal is a eco-effective option for constructions like Antenna Mounting Fcilities and Telecommunications. Its strength and longevity will serve for a long time. So there is no need to replace or do daily maintenance.


Gmetal manufactures different kinds of UBolts, for instance, Standard UBolt, Square UBolt, V-Type UBolt and Flattened UBolt. Gmetal UBolts have specific performance and characteristics that make them suitable for certain applications.

The key performance and characteristics are as following:

  • Secure Fasterning: U-bolts offer a secure and reliable method of fastening and attaching objects. The U-shape design allows for effective clamping and ensures that the attached components remain in place even under dynamic or vibrating conditions.
  • Customization: U-bolts can be customized to fit specific applications. They are available in various sizes, thread patterns, and material options, allowing for flexibility in design and accommodating different requirements.
  • Versatility: U-bolts are versatile and can be used in a wide range of applications. They are commonly employed for securing pipes, cables, conduits, or other components to structures, such as beams, poles, or frames.
  • Vibration Damping: U-bolts, due to their shape and design, offer some level of vibration damping. They help absorb and reduce vibrations, minimizing the potential for loosening or damage to the attached components.
  • Easy Installation: U-bolts are relatively easy to install. The threaded ends of the U-bolt allow for simple attachment with nuts or other fasteners, making the installation process efficient and straightforward.

Anchor Bolt

Gmetal also fabricates Anchor Bolt such as JBolt and LBolt which can be applied in non-structural applications like Railway Industry, Aviation Industry and Medical Industry. Gmetal Anchor bolts have specific performance and characteristics that make them suitable for anchoring and securing structures.

And the following are the main characteristics:

  • Load-Bearing Capacity: Anchor bolts are designed to provide high load-bearing capacity. They are capable of supporting significant loads and forces, ensuring the stability and structural integrity of the anchored structure.
  • Proper Embedment Depth and Diameter: Anchor bolts require proper embedment depth and diameter to ensure effective load transfer and resistance against uplift or lateral forces. Following industry guidelines and standards for anchor bolt installation is crucial to maintain their performance and integrity.
  • Reliability: Anchor bolts are known for their reliability and durability. When installed correctly, they provide a long-lasting and secure anchoring solution that contributes to the overall stability and safety of structures.

Eye Bolt

Gmetal also manufactures Eye Bolt,like Welded Eye Bolt, Forged Eye Bolt, Shoulder Eye Bolt, Thimble Eye Bolt and so on. You also can customized the shape of Eye Bolt which you need. Gmetal Eye Bolt has specific performance as following:

  • Secure Attachment: Eye bolts offer a secure attachment point for lifting, rigging, or hanging applications. They feature a circular or oval-shaped eyelet at one end, providing a reliable connection for hooks, cables, or other fasteners.
  • Versatility: Eye bolts are versatile and can be used in various applications. They are commonly employed for lifting and rigging operations, securing equipment or machinery, or as anchor points for overhead hanging objects.
  • Reliability: Eye bolts are known for their reliability when used within their specified load limits and installation guidelines. They provide a strong and secure attachment point, contributing to the overall safety and efficiency of lifting and rigging operations.
  • Load-Bearing Capacity: Eye bolts are designed to provide load-bearing capacity. They are capable of supporting significant loads when properly installed and used within their specified load limits.
  • Corrosion Resistance: Eye bolts can be manufactured from materials that offer good corrosion resistance, such as stainless steel or galvanized steel. This ensures long-term durability and protection against rust and corrosion, especially in outdoor or corrosive environments.
Eye Bolt

Other Related Productions

Antenna Mounting Bracket
Antenna Mounting Brackets

As the metal fastening part Gmetal Antenna Mounting Brackets are used in telecommunication to secure mounting of antennas.Although they come in a variety of shapes, size and materials, they have some characters in common:Durable, Adjustable, Compatible and Stable.

Solar Mounting Bracket
Solar Mounting Brackets

Gmetal Solar Mounting Brackets are the metal fastening part applied in solar racking roof to secured the solar pannel. They have common advantages: Durability, Adjustibility and Compatibility, even they are in different sizes, shapes and materials.

Related CNC Machining Parts
CNC Machining Parts

CNC Machining Parts can be made from different materials based on the application requirements. But the The choice of material depends on factors like strength, durability, corrosion resistance, electrical conductivity, and heat resistance.

  • “We are very happy to be the partner of Gmetal, they not only provide us the fastening and stamping parts in high quality, but also delieve the products in time. What’s more, they always try their best to meet our special needs.”

  • “We, Gmetal, not only can provide Metal Fastening and Stamping Parts for you, but also provide service like CNC Machining, CNC Milling CNC Punching, CNC Turning, Wire Cutting.”

The Imformation of Bolts

There are many types of bolts, including with UBolt, Anchor Bolt, Eye Bolt. UBolts are the most common bolt and widely used in machines and the engineering works like Antenna Mounting Facilities to tighten two or more parts together.

In today’s industrial landscape, bolts are fundamental for secure assembly in construction and manufacturing. Tracing their origins to ancient Greece, bolts have evolved significantly, offering a variety of designs for specific needs. As an experienced bolt manufacturer, Hangzhou Gulian Metal Products Co., Ltd. as a professional bolt manufacturer provides customized, strong, and reliable bolts, integral to modern structural integrity and designed to meet high-stress demands.

  • Materials for Bolts

Bolts come in steel, stainless steel, titanium, and brass. Steel is common for its robustness, stainless steel for corrosion resistance, titanium for strength-to-weight ratio in aerospace, and brass for electrical conductivity.

As a professional bolt manufacturer, Gulian can provide you with bolts of various materials, including high carbon steel, medium carbon steel, low carbon steel, stainless steel, etc. We will also meet your customized needs.

  • Bolt Design and Use

Bolts vary by type and use: anchor bolts secure to concrete, carriage bolts for wood, hex bolts in construction, and shoulder bolts where rotation is involved.

  • Selecting Bolts

Corrosion and stress can challenge bolt integrity. Choosing the right material and design mitigates these issues.

  • Advantages of Bolts

Bolts offer secure connections, ease of installation, adaptability, cost-efficiency, and in some materials, corrosion resistance. They can also be aesthetically pleasing.

  • Bolt Applications

Bolts are crucial in construction, automotive, aerospace, manufacturing, marine, agriculture, furniture, sports equipment, and medical devices, serving to fasten and stabilize components.

The Making oF Bolts

In the realm of engineering and construction, bolts stand as foundational fixtures, yet their production unfurls as a sophisticated dance of technology and precision. Delve into the journey of raw steel as it metamorphoses into meticulously crafted metal essentials.

Bolts vary in size and shape, yet follow a standard production: shaping by cold forging, heat treating for strength, surface treating for durability, then packaging. Advanced designs may require extra steps. As a pursuit of quality bolt manufacturer, Gulian follows strict production standards to produce high quality bolts for customers

GMP Bolt Manufacturing Process

  • Cold Forging Excellence

At Hangzhou Gulian, we initiate cold forging with robust steel wire rods, meticulously uncoiled and cut to precise lengths, adhering to ISO 898‑1 standards. Our specialized tooling, boasting up to 200 parts with ultra-fine tolerances, cold forges the wire into exact shapes at room temperature through high-pressure dies. This precision engineering enables us to mass-produce bolts with exceptional uniformity and speed.

For complex bolt configurations, additional machining such as turning or drilling is employed. Turning sculpts the bolt by high-speed rotation, while drilling creates necessary perforations. At this juncture, we may also attach washers to enhance the bolt’s utility.

  • Advanced Heat Treatment

Every bolt undergoes a rigorous heat treatment to harden the steel, with threading typically introduced pre-treatment for cost efficiency. Rolling, akin to cold forging, and cutting are the methods we employ to craft threads. Post-treatment threading, albeit more demanding due to the steel’s hardened state, offers enhanced fatigue resistance, vital for critical applications like engine bolts, and is a service we proudly provide.

  • Precision Sizing and Protective Coating

For elongated bolts, straightening procedures counteract heat treatment’s tendency to revert steel to its original form. Surface treatments vary based on the bolt’s application and customer specifications. Zinc plating is frequently used for corrosion resistance, applied via electrolysis, though zinc flakes are an alternative for superior corrosion defense.

Non-corrosive environments allow for the economical use of phosphate. Following surface treatment, we’re equipped to add final touches such as brackets or patches—nylon for improved grip or liquid for optimal threading torque.

The culmination of this intricate process is a bolt ready for Hangzhou Gulian’s stringent quality checks, guaranteeing uniformity and reliability, before being dispatched globally to our esteemed clientele.

Gmetal: Comprehensive Bolt Solutions

Gmetal stands as a one-stop bolt manufacturer catering to a vast array of needs. Our portfolio spans standard hex bolts, U-bolts, eye bolts, and anchor bolts to bespoke creations tailored to your specifications. Whether you have a specific bolt design in mind or require a custom solution, we are equipped to deliver. We proudly serve diverse sectors including automotive, construction, marine, electrical, and custom fabrication, among others. Whatever your bolt requirement, trust GMP to provide with precision and quality.


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