Elevator Bolts: Types, Differences and Functions

Elevator Bolts

Elevator bolts stand out for their large, flat, and slim countersunk heads, designed to sit flush with the belt surface in applications like attaching elevator buckets. This prevents any interference with the pulley system. Choosing the right type of elevator bolt depends on the specific needs of the project and the installer’s preference.

These bolts come in three main types of materials: plain carbon steel, zinc-plated carbon steel, and stainless steel. Bolts made of plain carbon steel are characterized by their natural black appearance and typically have a light oil coating to slow down rusting. Zinc-plated bolts, while also made from low carbon steel, offer enhanced resistance to rust thanks to their zinc coating. Stainless steel bolts, known for their resistance to rust, are ideal for use in environments that are either very hot, involve food production, or are exposed to harsh chemicals, like agricultural fertilizers. For applications within bucket elevators, it’s important to use bolts that meet or exceed SAE J429 Grade 2 standards due to the strength demands of such settings.

What are Elevator Bolts

Elevator bolts are a type of fastener designed primarily for the secure vertical lifting of heavy materials. They feature a distinct flat, smooth, or countersunk head, which allows for a flush surface once installed, reducing the risk of snagging or catching on materials or equipment. This makes them particularly useful in applications like conveyor systems, where a smooth surface is crucial to the operation.

Types of Elevator Bolts

Elevator bolts come in several types, each tailored for specific applications and materials. The most common types include:

Fanged Bolts

Fanged Elevator Bolts

These bolts have two or more sharp, projecting teeth below the head. The fangs dig into the surface material to prevent the bolt from rotating during installation, making them perfect for belting applications where grip is crucial.

The fanged elevator bolt stands out with its duo of sharp fangs that dig deep into both the cover and the core of the elevator belt. These fangs serve a crucial role, ensuring the bolt head remains firmly in place by preventing any rotational movement. This design allows for the use of a resistance lock nut, such as a nylon-inserted lock nut, enhancing the bolt’s reliability. This method significantly reduces the risk of the nut loosening from vibration. However, if the fangs are longer than the elevator belt’s thickness, opting for a bolt without fangs is advisable.

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Ref70 Bolts

Ref70 Bolts

Designed specifically for heavy-duty applications, Ref70 bolts are known for their high strength and durability. They are often used in mining and quarrying operations to secure thick belts or layers of material.

Features of Ref70 bolts include:

  1. High Tensile Strength: With a minimum tensile strength of 700 MPa, these bolts are engineered for applications requiring high load-bearing capacity.
  2. Controlled Threading: The threading is designed to ensure maximum engagement and load distribution, which is critical for maintaining joint integrity under dynamic loads.
  3. Enhanced Durability: Made from alloyed steel or other high-strength materials, Ref70 bolts are not only strong but also resistant to wear, corrosion, and fatigue.
  4. Precision Engineering: The dimensions and tolerances of Ref70 bolts are meticulously controlled to ensure consistent performance and reliability in critical applications.
  5. Versatile Design Options: Available in various sizes, lengths, and finishes, Ref70 bolts can be tailored to meet the specific requirements of different applications and environments.

Functions and Applications:

Ref70 bolts play a crucial role in ensuring structural integrity and safety in various high-stress environments. Their design and material properties make them suitable for a wide range of applications:

  1. Construction and Civil Engineering: Used in the construction of bridges, high-rise buildings, and infrastructure projects where structural integrity and longevity are crucial. They secure steel frames, concrete anchors, and other critical structural components.
  2. Heavy Machinery: In the manufacturing and maintenance of heavy machinery and equipment, Ref70 bolts provide the necessary strength and durability to withstand the operational stresses of mining, agriculture, and construction machinery.
  3. Automotive and Aerospace: Utilized in the assembly of vehicles and aircraft, where their high strength-to-weight ratio contributes to safety without significantly increasing the overall weight.
  4. Energy Sector: Essential in the construction and maintenance of wind turbines, refineries, and other energy infrastructure, where they must endure extreme environmental conditions and dynamic loads.
  5. Marine Applications: Their corrosion resistance makes them suitable for shipbuilding and offshore platforms, ensuring long-term performance in harsh marine environments.

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Euro Bolts

Euro Bolts

Common in European machinery, these bolts have a larger head diameter, offering increased surface area for better load distribution.

Characterized by a flat or low-profile head, a disc-like shape that allows the bolt to lie flush against the connected surfaces, these bolts ensure a smooth, snag-free exterior. The shaft of the bolt, typically threaded along part or all its length, enables a tight and secure fastening.

Features of Euro elevator bolts include:

  1. Flat or Low-Profile Head: The design minimizes protrusion, providing a smooth surface that reduces the risk of catching or snagging on materials or equipment.
  2. Broad Head Diameter: Offers increased surface area for better load distribution, minimizing the risk of damage to the material being secured.
  3. Partial or Fully Threaded Shaft: Allows for varying degrees of engagement and tensile strength, catering to different material thicknesses and application requirements.
  4. High-Strength Materials: Made from materials like carbon steel or stainless steel, Euro elevator bolts are built to withstand significant stress, vibration, and environmental conditions.

Functions and Applications:

Euro elevator bolts are primarily designed to fasten components in a manner that requires a flush or smooth surface. Their unique properties make them particularly useful in applications where protruding heads can cause operational issues or where aesthetics are important. Key functions and applications include:

  1. Elevator Industry: They are extensively used in the assembly and maintenance of elevator buckets and related machinery, ensuring a smooth interior surface that minimizes material catching or blockage.
  2. Conveying Systems: In belt conveyors, Euro elevator bolts secure the belting material to the conveyor framework, especially in food processing, agriculture, and material handling industries, where a smooth operation of the belt is crucial.
  3. Automotive Sector: Utilized in areas requiring a flat or flush surface to prevent aerodynamic drag or for aesthetic purposes.
  4. Furniture Manufacturing: In furniture design, especially those requiring a sleek, flat surface without visible bolt heads, ensuring both functionality and design elegance.
  5. Construction and Infrastructure: Applied in metal roofing and cladding systems, where a flush finish is essential to prevent water ingress and to maintain a clean, aesthetic exterior.

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Ordinary Bolts

Ordinary Elevator Bolts

Ordinary elevator bolts are more common and economically designed for securing and fastening components within vertical transportation systems and other applications where a smooth surface is required. These bolts feature a distinct flat or dome-shaped head that allows them to sit flush against the surface, preventing any snagging or interference with the movement of materials or parts. Their design is optimized for ease of installation and reliable performance in a variety of settings. Because of their low cost, their quality is not as good as fanged bolts or euro bolts.

Features of ordinary elevator bolts include:

  1. Flat or Dome-Shaped Head: The head design ensures a smooth finish on the surface, critical in applications where exposed fasteners can cause operational issues or pose safety hazards.
  2. Variety of Sizes: Available in a range of sizes and lengths to accommodate different thicknesses and types of materials, providing versatility across various applications.
  3. Durable Construction: Typically manufactured from steel or stainless steel, ordinary elevator bolts offer a good balance of strength and corrosion resistance, suitable for many environments.
  4. Easy Installation: Designed for straightforward installation, these bolts can be easily fastened with standard tools, facilitating quick assembly and maintenance.
  5. Threaded Shaft: The fully or partially threaded shaft provides robust engagement with the nut or the material itself, ensuring a secure fastening that can withstand vibrations and loads.

Functions and Applications:

Ordinary elevator bolts have a broad range of functions and applications, reflecting their versatility and reliability in securing components:

  1. Elevator Buckets: Primarily used in the attachment of buckets to conveyor belts in grain elevators and other material handling systems, ensuring a tight and secure fit that prevents material spillage.
  2. Conveying Systems: Ideal for use in various types of conveyors, including belt conveyors in the agricultural, mining, and manufacturing sectors, where a flat surface is necessary to facilitate the smooth movement of goods.
  3. Agricultural Equipment: Used in the assembly of farming machinery and attachments, where their flush-mounting capability helps prevent material build-up and ensures the smooth operation of equipment.
  4. Flooring and Decking: Applied in the construction of flooring and decking where a flat surface is required to prevent tripping hazards and to ensure a clean, aesthetic finish.
  5. Automotive and Transportation: In the manufacturing of vehicles and transportation equipment, these bolts can be used in areas requiring flat or flush surfaces for aerodynamic efficiency or aesthetic reasons.

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Key Differences

The primary differences among elevator bolts lie in their head design and the presence or absence of fangs under the head. These differences impact their suitability for various materials and applications. For instance, fanged elevator bolts are preferable for conveyor systems that require additional grip, whereas flat head bolts are suited for applications needing a smooth finish.

Bolt TypeKey FeaturesMain DifferenceApplications
Euro BoltsLow-profile head, broad head diameterFlat or almost flush surface, designed for aesthetics and snag-free environmentsElevators, conveyor systems, automotive, furniture, construction
Ordinary Elevator BoltsLarge, flat headSpecifically designed for vertical transportation applicationsElevator buckets, vertical transportation systems
Fanged BoltsTeeth under the head for enhanced gripThe presence of fangs or teeth for better grip on surfacesConveyor systems, especially in material handling and processing industries
Ref70 BoltsHigh tensile strength (700 MPa), enhanced durabilityHigh-strength applications, capable of handling significant stress and loadConstruction, heavy machinery, automotive and aerospace, energy sector, marine applications
Elevator Bolts Types, Differences and Applications

Installation Tips

Proper installation is crucial for the optimal performance of elevator bolts. Ensure the surface is clean and flat before installation. Use appropriate tools to avoid over-tightening and damaging the material. For fanged bolts, ensure the fangs properly engage with the material to prevent rotation.

Conclusion

Elevator bolts are indispensable in various industrial applications, offering secure, reliable fastening solutions for vertical lifting and material handling. As an elevator bolts manufacturer for over 10 years, Jingwei knows how to make these bolts and customize and design them to fit your needs. Contact us to get a quote for elevator bolts.

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