Working Loads vs Breaking Loads

Rigging Pulleys - Industrial Hardware - Ronstan

Understanding the safety factors of the equipment you are working with is paramount no matter the industry you are working in. With this, it is important to comprehend the differences between working loads and breaking loads – which may sound the same, but they are not. Any configuration of equipment is only as strong as its weakest, or lowest, rated parts. Both terms are a form of rating.

The term working load limit is most frequently used in rigging terminology. It was the cornerstone of engineering for many years. It is the breaking load of a component divided by an appropriate factor of safety – a safe load that was the maximum carrying capacity. The terms usually apply to equipment such as hooks, slings, shackles, and the like.

The working load, sometimes also known as the safety working load, or normal working load (just to confuse things further) is the mass that the equipment being used can safely hold, lift, or lower without breaking. In shorter terms, it’s the maximum load that can be applied to the product safely when in general service. This is most accurate when the product is new and without any wear. This is measured on a straight line pull only, and side pulling can produce different results. It is also important to make sure that all components in a system have the same working load limit.

block tackle pulley system - Industrial Hardware - Ronstan

The working load is one fifth of the minimum breaking strength. The tests, which are undertaken in the laboratory, are conducted under normal environmental conditions. When using in adverse weather or other settings that may include different chemical levels, this should be taken into consideration.

The working load limit of any piece of equipment must never be exceeded, and components must be properly matched. As logic would suggest, it is best to avoid heavy impact shock loads, or any abstract movement such as winging or jerking. Anything like this can lead to stress on the product which leads to the breaking strength and the working load limit being exceeded, causing the wider mechanism to fail.

If you need advice on the right products for your safety equipment please contact us. 

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Ronstan’s end-to-end design, manufacture and distribution operation delivers high specification products for all serious hardware applications.

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