Crosby S-279 UNC Shoulder Type Machinery Eye Bolts – Forged Steel – 700kg to 29.5t WLL
CRO-EB-S-279-UNC
Heavy-duty Crosby S-279 forged steel shoulder machinery eye bolts with UNC threads. ASME B30.26 compliant and fatigue rated for 20,000 cycles. Ideal for lifting and rigging applications with working load limits from 0.70 tonnes to 29.48 tonnes.
Price on request
Description
The Crosby S-279 UNC Shoulder Type Machinery Eye Bolts are high-performance lifting components designed for demanding rigging, hoisting, and machinery lifting operations. Manufactured from forged steel that is quenched and tempered, these eye bolts provide exceptional strength, reliability, and durability in industrial lifting environments.
Designed with UNC (Unified National Coarse) threading, the S-279 eye bolts are widely used in North American-standard equipment, machinery installations, and lifting assemblies. Their shoulder design allows the bolt to seat firmly against the mounting surface, ensuring proper load distribution during lifting operations.
The working load limits listed for these eye bolts are based on in-line loading conditions. When used correctly for straight vertical lifts, the S-279 provides safe and dependable performance. For angled loading applications, Crosby provides detailed guidance to ensure the correct reduction in load capacity is applied for safe operation.
Each S-279 eye bolt is fatigue rated at 1.5 times the working load limit for up to 20,000 cycles, making it suitable for repetitive lifting tasks where long-term reliability is critical. The bolts also feature a 5:1 design factor, with a maximum proof load equal to twice the working load limit, providing an additional margin of safety in lifting applications.
Crosby manufactures these eye bolts to meet or exceed the requirements of ASME B30.26, including identification standards, ductility requirements, proof load testing, design factor verification, and temperature performance specifications. Additionally, Crosby products meet critical performance requirements not specifically addressed by ASME B30.26, including fatigue life, verified impact properties, and full material traceability.
Available in sizes from 3/8″ to 2-1/2″ UNC, the Crosby S-279 series offers working load limits from 0.70 tonnes up to 29.48 tonnes, making them suitable for a wide variety of industrial lifting applications including machinery installation, construction lifting points, and heavy equipment handling.
With their proven strength, strict compliance with industry standards, and Crosby�s globally trusted reputation, the S-279 UNC Shoulder Machinery Eye Bolts are a reliable solution for safe and efficient lifting operations.
Safety & User Instructions
Ensure the eye bolt is fully tightened and seated against the mounting surface.
Working load limits apply to in-line lifting only unless angle loading guidelines are followed.
Never exceed the specified working load limit (WLL) for the bolt size.
Inspect threads, shoulders, and eyes for damage before each use.
Do not use eye bolts showing deformation, corrosion, or cracks.
Ensure the receiving thread is clean and capable of supporting the load.
Follow all applicable lifting and rigging standards including ASME B30.26.
Keep personnel clear of suspended loads and always wear appropriate PPE.
Recommended Applications
Machinery lifting and installation
Industrial rigging operations
Heavy equipment maintenance
Construction and engineering projects
Marine and offshore lifting applications
Technical information
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