Eye bolts are typically used to attach ropes, string or chains to objects. Many people string wire from eye bolts on the back of picture frames, for instance, to allow them to rest on hooks or nails on a wall. Several different types of eye bolts are available in a number of materials. Inspect eye bolts regularly to check for wear and effectiveness.
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Eye bolts consist of a loop at the end of a threaded bolt. The loops are used as anchors for ropes, cables or chains. Some eye bolts feature the ability to pivot or swivel.
Eye bolt thread sizes are available in standard inches and metric millimetres. Common sizes in standard measurements range from ¼ inch all the way to 2 ¼ inches in diameter. Common sizes in metric measurements range from 6mm to 54mm in diameter, and are available in 1mm increments.
Some common types of eye bolts are forged eye bolts, screw eye bolts, shoulder eye bolts, pivoting eye bolts and thimble eye bolts. Each type of eye bolt has its practical applications. Forged eyebolts offer higher load ratings than most eye bolts. Screw eye bolts are often used for lifting and rigging.
The specifications of eye bolts are threaded length, maximum load capacity, length of shank, inside diameter (ID) of the eye, eye thickness and total weight. An eye bolt's maximum load capacity is a rating that indicates the maximum load a given eye bolt can handle. Shank diameter on fully-threaded eye bolts is the length of thread.
Specifications are made to reflect both standard and metric forms of measurement. Specifications can vary depending on the material an eye bolt is made of and the amount of material that goes into the overall construction of an eye bolt.
For applications that require strictly vertical lifting, load-rated eye bolts are available. Load-rated eye bolts are not recommended for applications involving angular lifting. Eye bolts that are not load-rated should not be used for lifting. Regular nut eye bolts and shoulder machinery eye bolts are traditionally recommended to hold loads that are pulling straight down. Shoulder nut eye bolts can be employed for angular loading.
Eye bolts are manufactured out of several materials including aluminium, bronze, hardened and stainless steels, brass and titanium. Aluminium is traditionally lighter but not as strong as steel. Stainless steel has anti-corrosion features but cannot be hardened like carbon steel.
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