Eye Bolt with Collar

Updated: 2026-09-12

Overview

The Eye Bolt with Collar is a specialized fastener designed for lifting and load-securing tasks. It consists of a threaded shank for installation into machinery or structures and a forged eye for attaching rigging equipment. The integrated collar (or shoulder) distributes stress evenly, reducing the risk of material failure. Unlike standard eye bolts, this design is engineered for angular lifts up to 45 degrees when properly installed. These bolts are manufactured under international standards like DIN 580 (Germany) or ANSI B18.15 (USA), ensuring consistent quality and performance. They are indispensable in industries requiring heavy-load handling, such as construction, shipping, and stage rigging.

Structure and Working Principle

The bolt features three key components: the eye (a closed loop for attachment), the collar (a flat shoulder beneath the eye), and the threaded shank. The collar sits flush against the mounting surface, preventing the eye from bending under load and transferring forces axially. Threads are typically metric (e.g., M6–M64) or UNC/UNF for compatibility with global standards. When installed, the shank is screwed into a pre-tapped hole until the collar contacts the surface. Loads applied to the eye generate tension along the shank’s axis, while the collar resists shear forces. Proper installation depth (minimum 1.5x shank diameter) is critical to prevent thread stripping.

Key Features

Durability: High-tensile materials like grade 8.8 carbon steel or A4 stainless steel withstand dynamic loads and harsh environments. Corrosion-resistant coatings (e.g., hot-dip galvanizing) extend service life. Safety: Collared designs reduce stress concentrations, minimizing the risk of eye deformation. Working load limits (WLL) are clearly marked, often ranging from 0.03 to 25 metric tons. Some variants include secondary safety loops or swivel eyes for multi-directional loading. Compatibility: Available in coarse/fine threads and multiple eye shapes (round, teardrop) to suit diverse rigging systems. Marine-grade versions meet ISO 17796 for saltwater applications.

Application Areas

Construction: Anchoring prefabricated concrete elements or suspending HVAC systems. Often used with wire ropes or synthetic slings. Marine: Securing cargo on ships or dockside equipment. Stainless steel 316 bolts resist saltwater corrosion. Entertainment: Rigging stage lights and sound equipment. Swivel-eye variants allow for positional adjustments. Industrial: Installing overhead cranes, conveyor systems, or machinery requiring periodic maintenance lifts. Angular-load-rated models are essential for non-vertical applications.

Maintenance and Precautions

Regularly inspect for cracks, thread damage, or eye elongation. Replace bolts showing ≥10% deformation. Lubricate threads periodically to prevent seizing, especially in stainless steel bolts. Always align loads vertically; angular lifts require specifically rated bolts. Never weld or modify bolts, as this compromises their load capacity. Use matching washers or backing plates on soft surfaces to prevent collar embedding. Storage: Keep in dry conditions to avoid rust. Organize by load rating and thread size to prevent mismatches during urgent use.

B2B Procurement Guide

Technical Specifications: Request certified test reports for load ratings and material composition. Verify compliance with standards like ASME B30.26 for overhead lifting. Supplier Evaluation: Prioritize manufacturers with ISO 9001 certification and batch-traceability systems. Customization options (e.g., laser-marked WLL) add value for safety-critical applications. Ordering: Bulk purchases (100+ units) typically offer 15–30% cost savings. Lead times vary from 1 week (standard sizes) to 4 weeks (custom alloys). Consider regional logistics—e.g., coastal buyers may prefer local stainless steel suppliers to reduce shipping costs.