Eyebolts Technical Information
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Basics of... Eyebolts and Hoist Rings
Eyebolts and Hoist Rings are most commonly used as an anchor point to lift Large Dies and Fixtures, Heavy Machinery, Mobile Equipment, as well as for Structural Handling Equipment and Cargo. To ensure maximum safety, careful consideration of the application should be made before making a selection.
Eyebolts
Designed for vertical lifts only. Lateral or uneven forces can significantly reduce handling load. Additionally, any modification of an eyebolt can also affect handling load. When selecting an Eye Bolt, consider the conditions
- Zinc Plated - Good rust and corrosion resistance
- Galvanized - Provides better rust protection than Zinc
- Alloy Steel - Improved load limits and temperature protection
- Stainless Steel - Best corrosion resistance
Hoist Rings
Designed for heavy angular lifts and unbalanced loads. They have a 180° pivot on the bail and a 360-degree° swivel on the base. This combination allows a hoist ring to maintain its full handling load at any angle (see formula below to calculate force per anchor point).
Determining Forces on Anchor Points
The force on each anchor point is not just the total weight divided by the number of anchor points; the lift angle also plays an important role. Force can be greater at lower angles (see below).
F = W/ N sin A
A=65°, F= 4000/ 4 sin 65° = 1103lbs.
A=14°, F= 4000/ 4 sin 14° = 4134lbs.
Where F= pounds per anchor point in a 4000lbs, 4-point lift
F= Force on each hoist ring
W = Total Weight (i.e. 4000 lbs)
N= Number of hoist rings
A= Lifting Angle
Source: American Drill Bushing, March 2004 Hoist Ring
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