A clamp load, also referred to as a preload, is the force that holds a joint together. In a bolted joint, the compression occurs on the surface of impact between two parts of the joint, creating a clamping force. When used in bolted joints, this creates tension that keeps the bolt together and makes it stronger and more reliable. If the clamp load of a bolted joint is too high, it could lead to wear and tear on the threads. If it is too low, the bolt may loosen.

Securing a connection in an application can be more complicated than it appears. To the average person, a clamp is simple – turn the screw and the clamp tightens up. But when you break down the interactions and try to quantify individual contributions, things aren’t as simple as they appear.

A clamp load, also referred to as a preload, is the force that holds a joint together. In a bolted joint, the compression occurs on the surface of impact between two parts of the joint, creating a clamping force. When used in bolted joints, this creates tension that keeps the bolt together and makes it stronger and more reliable. If the clamp load of a bolted joint is too high, it could lead to wear and tear on the threads. If it is too low, the bolt may loosen.

When a bolt is tightened into a mating threaded part, the two components interact by pulling each other together. This force is called clamp load and is what keeps the joint from coming apart. Provided that the force pulling it together is greater than the outside forces (service loads) that are trying to pull it apart, no problem will result with the attachment. Unfortunately, friction plays a large part in this system. Of the 100% of torque applied to fasteners to pull them together, 50% is lost in underhead bearing face friction and 40% is lost through friction between the mating threads.

When it comes to handling different material load types in a safe and efficient manner, many opt to use durable lifting clamps to complete the job. These tools come in a wide range of makes catered for specific materials and freight sizes. However, when choosing the right lifting clamp, knowing which specifications you need is crucial for safe and proper usage.Read on to learn more about the different factors to consider when choosing a lifting clamp, as well as the different types we offer through U.S. Cargo Control.

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