How Do I Install a Crosby Eye Bolt?
Forged Crosby eye bolts are useful for rigging and hoisting loads as long as correct installation and safety procedures are followed. Eye bolts are designed to be strongest when the direction of pull is in line with the shank of the bolt. Angular lifting, while possible, greatly reduces the load capacity of a Crosby eye bolt.Additionally, shoulder nut eye bolts must be correctly seated against the load. This may require shimming in order to orient the eye of the bolt in the correct plane for angular lifting. Such shimming should not exceed a thickness of one thread width.
Things You'll Need
- Tap
- Cutting oil
- Hex nuts
- Washers
- Socket or wrench
Instructions
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Tapped Hole Applications
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1
Drill and tap a hole in the load where the Crosby eye bolt is to be installed. Use the appropriate cutting oil mixture for the load material.
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2
Screw the Crosby eye bolt into the tapped hole until the shoulder is seated firmly. If the desired axis cannot be achieved with the shoulder seated, place a washer with an exterior diameter similar to the shoulder and an interior diameter as close as possible to the shank diameter between the shoulder and the load. The washer should not be thicker than one thread width.
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3
Attach rigging to the eye with a hook or shackle. If possible, the load should be in line with the shank of the eye bolt. If angular lifting is unavoidable, remember that at 45 degrees, the working load is reduced to 30 percent of the rated load, and at 90 degrees, the working load is reduced to 25 percent of the rated load.
Untapped Hole Applications
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4
Insert shouldered eye bolt through an untapped hole of the same diameter so the threaded portion extends beyond the load.
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5
Add one or more steel washers and a hex nut, tightened until the shoulder of the eye bolt seats firmly. The nut must be able to fully engage the threads.
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6
Attach rigging to the eye with a hook or shackle. Load rating reduction for angular lifting is the same as for tapped holes.
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