30 Sep 2026

How to Choose the Right Ratchet Strap Capacity

Ratchet straps are one of the most useful and popular pieces of equipment across multiple industries. They are heavy-duty fabric bands with a metal handle and spool (ratchet) mechanism. This system is designed to hook in at multiple ends, using the different ratchet strap load capacities to pull taut and hold in place, with a release trigger to loosen up and unspool. 

They have multiple uses in the workplace primarily for securing larger items, like furniture, appliances or boxes on trailers. Ratchet straps are also commonly found lashing materials, ladders and piping to van racks in construction, and holding down vehicles on loaders. As they are so versatile there are many different ratchet strap load capacities, but what does this actually mean?

What Does Ratchet Strap Load Capacity Mean?

In simple terms, ratchet strap load capacity refers to the maximum force or weight a strap can hold or restrain in a safe manner during use. Upon using a ratchet strap, you will notice a selection of key terms on the strap itself, with the most important being the Lashing Capacity (LC). 

LC is measured in decanewtons (daN) and is equal to around 1 kg of force. The measurement outlines the maximum straight-pull force the strap can handle in regular use, and is crucial for load calculations. Lashing capacities are typically half the breaking strength of the ratchet, at a safety ratio of 2:1.

LC is the maximum tension a ratchet strap can withstand to hold cargo in place, while a working load limit (WLL) is the maximum safe load or force for consistent, day-to-day lifting tasks. WLL equipment tends to have safety ratings of 4:1 or even 6:1.

Understanding Ratchet Strap Load Ratings

Lashing Capacity (LC)

LC refers to the maximum force a ratchet strap can safely withstand when pulled in a straight line. Measured in daN, LC is arguably the most important measurement needed when calculating the requirements for direct lashing applications.

Standard Tension Force (STF)

Standard Tension Force (STF) is the tension generated when a ratchet strap is tightened over a load. Measured in daN, STF is used when calculating frictional lashings and should be clearly shown on the strap’s label.

Breaking Strength

Breaking Strength indicates the force required to cause a ratchet strap to fail during testing. It should not be confused with Lashing Capacity, as breaking strength is not used when determining how many straps are needed. It is typically double the safe LC load, ensuring that loads can be secured as safely as possible.

How Do You Calculate the Ratchet Strap Capacity You Need?

Calculating the required ratchet strap capacity depends on the load’s weight, size and shape, as well as the securing method used. Direct lashings, frictional or top-over restraints require different calculations. 

You should also be sure that you consider the number and overall positioning of straps, the friction between the load and surface and the angle of each strap. These many factors determine the forces involved and help ensure the load is secured safely and effectively.

Common Ratchet Strap Capacities

What Else Affects Load Security?

Securing a load effectively involves more than simply selecting a strap with the right rating for your lifting needs. Things like the dimensions, stability and shape of the load can all affect how it behaves in transit. Then there is the possibility for surface friction between the load and the vehicle bed itself, while the positioning of the strap and the chosen restraining method influence the forces applied.

It is critically important for safe operations that, before every use, all ratchet straps are fully inspected for fraying, cuts, damaged stitching or other deterioration. Check that attachment points are secure and suitable for the intended load.

How to Read a Ratchet Strap Label

The information found and printed on a ratchet strap label can help you determine whether or not it is suitable for a particular load. Primarily, you should focus on the LC and STF, which apply to different securing methods.

These labels will also typically provide details about the strap length, manufacturer details and other important product specifications. Look for the BS EN 12195-2 marking when checking compliance with the relevant standard for web lashings made from man-made fibres.

Common Mistakes When Choosing Ratchet Straps

Selecting a ratchet strap purely by its breaking strength can lead to the wrong product being used for the job and a significant decrease in safe working practices. The load’s weight should be considered alongside the restraint method, friction, strap angle and required number of lashings.

Another particularly common error is continuing to use a strap that is showing signs of visible damage or excessive wear and tear. Once your strap is looking worn out, a replacement is needed to keep your tasks safe and efficient.

Loads also vary considerably, so just because a strap works for one application doesn’t mean that it provides adequate restraint for another. Always assess the specific requirements before securing a load. 

Choosing the Right Ratchet Strap for Your Load

There isn’t a one-size-fits-all option when looking at ratchet strap load capacities. The ideal option depends on the load itself, the way it needs to be secured, the weight, size, characteristics and more. 

Before deciding on a ratchet strap, you must consider whether the strap length and width are suitable, along with the correct end fittings for the intended attachment points. The product ratings can vary greatly between different straps, so it is always crucial to check manufacturer specifications and the attached label before use. 

FAQs

What does LC mean on a ratchet strap?

LC stands for ‘Lashing Capacity’, which is the rating and indication of the maximum force that a ratchet strap can safely withstand in a straight pull. This strength is measured in daN and used when calculating direct load restraint.

What is the difference between lashing capacity and breaking strength?

Lashing Capacity represents the rated force that is used when securing a load, while Breaking Strength refers to the absolute endpoint where the strap will fail. Breaking Strength is usually double the Lashing Capacity, but should never be used when making load calculations.

How many ratchet straps do I need?

The number of ratchet straps required depends on the load, securing method, friction, strap capacity and angle. An appropriate load-securing calculation should be carried out to determine how many straps are necessary for safe restraint.