How are crane hooks measured?
To check, use a measuring device (i.e., tape measure) to measure the distance between the marks. The marks should align to either an inch or half-inch increment on the measuring device. If the measurement does not meet criteria, the hook should be inspected further for possible damage.
What is a cranes hook called?
Lifting hooks are used for grabbing and lifting loads by means of a crane or hoist. Lifting wire rope sling, chain or rope that is attached to a lifting hook should have a safety latch on it to prevent it from being disengaged.
How much does a crane hook cost?
Price Range
| 3/8″ CM Foundry Hook, Eye Type SKU: 474799 Price: $265 | 3/4″ CM Foundry Hook, Eye Type SKU: 474802 Price: $559 |
|---|---|
| 5/8″ CM Sling Hook, Eye Type SKU: 558629 Price: $210 | 1/2″ S Hook, Alloy SKU: 562250 Price: $74 |
| 5/8″ S Hook, Alloy SKU: 562262 Price: $80 | 3/8″ CM Sling Hook, Clevis Type SKU: 657719 Price: $90 |
What is the permissible opening of hook throat allowed?
Throat Opening: Any distortion causing an increase in throat opening exceeding 5% or as otherwise directed by the hook manufacturer. Wear: Any wear exceeding 10% of the original section dimension of the hook or its load pin or as otherwise directed by the hook manufacturer.
How much twist Can a crane hook have?
Make sure the hook’s safety latch is functional and not bent or stretched. The hook itself should not be stretched more than 15 percent of its original size or twisted more than 10 percent in either direction. If it is, it must be replaced.
What is the crane boom?
A crane boom is a long fixed or hydraulic arm that is used to move large objects in construction. It bears most of the weight when positioning a load, and its length determines a crane’s maximum reach. Crane booms take on a variety of roles and appearances depending on the type of crane.
How many degrees can a hook be twisted?
When multi-leg slings are placed in the base (bowl/saddle) of the hook, the maximum included angle between sling legs shall be 90° or as determined by the hook manufacturer. The maximum sling leg angle with respect to the hook centerline for any rigging arrangement shall be 45°.
How much wear is allowed in a hook?
Each hoist manufacturer’s manual will tell you how to measure the hook. Look for excessive wear or corrosion on the hook. Any wear exceeding 10% of the original section dimension of the hook or its load pin means the hook should be removed from service.
What is Reeving on a crane?
Reeving (rope): The reeving of the hoist is the path of the rope between the hoist and the load block. Double reeving is two parts of wire rope leading off of the drum, one from each end of the drum, creating a hook movement referred to as True Vertical Lift.