Elevator Bolts

Elevator bolts are specialized, low-profile fasteners defined by their distinctly large, thin, and flat heads. Engineered initially for agricultural and material handling applications, their primary purpose is to secure buckets to vertical conveyor belts. The ultra-low head profile minimizes surface protrusion, allowing moving components and belting to glide over the fastener without obstruction or abrasive wear. An integrated square or ribbed under-neck prevents the bolt from rotating, enabling high-torque tightening from a single side.

Materials and Finishes

Designed to withstand both heavy mechanical loads and potentially corrosive agricultural or industrial environments, elevator bolts are manufactured from durable Carbon Steel and Stainless Steel. They are available in an extensive range of protective coatings and finishes, including Zinc Plated, Hot-Dip Galvanized, Black Oxide, Nickel Plating, Zinc-Aluminium Flake Coating, Zinc Flake Coating, and PTFE.

Technical Specifications and Standards

Elevator bolts must comply with specific structural and dimensional criteria to ensure secure material handling and reliable performance.

• Standards: Manufactured to conform with ASME B18.5, ASTM A193, DIN 15237, and ASTM A307.
• Head Styles: Feature a Large flat or Countersunk Head.
• Neck Styles: Equipped with a Square Neck or Fanged Underside for anti-rotation in soft materials.
• Grades: Supplied in metric grades 3.6, 4.6, 8.8, and stainless grades A2 and A4.
• Mechanical Properties: Deliver a minimum Tensile Strength of 54,000 psi, a Yield Strength of 36,000 psi, and Hardness ranging from Rockwell B70 to B100.
• Thread Types: Compatible with various thread profiles, including UNC, UNF, UN, ISO Metric, and ACME.

Applications and Industries

The unique flush-mount design and anti-rotation mechanics of elevator bolts make them indispensable for applications involving moving belts or soft substrates. Common uses include:

• Material Handling: Attaching buckets to canvas or rubber belts in grain elevators and mining conveyors.
• Agriculture: Securing components in harvesting equipment and feed processing machinery.
• Woodworking: Flush-mounting fixtures in custom cabinetry, flooring, and timber construction.
• General Manufacturing: Used wherever a smooth, low-profile bearing surface is required to prevent snagging.

Conclusion

Elevator bolts remain a foundational component in the material handling and agricultural sectors. Their clever combination of a low-profile head and anti-rotation neck provides a secure, flush, and highly functional fastening solution that minimizes system wear and maximizes operational efficiency.