Why must lifting slings meet a six‑times safety factor?
Classification:
Time：
2025-06-02
What is a “safety factor”? The safety factor is primarily a criterion used in engineering structural design to assess the degree of structural safety. Determining the safety factor requires accounting for various uncertainties, as well as considering the economic implications of the design and the consequences of structural failure.
Of course, factors such as the protection of life and property, as well as social impacts, are also indispensable.
As the saying goes, every trade has its own rules, and lifting slings are no exception. According to current standards, all lifting slings used and manufactured domestically must strictly comply with… [Chinese National Standard JB/T 8521-2007] , at its core, is what we refer to as: a sixfold safety factor!
For example:
– With a safety factor of 6 and a working load of 1 ton, this lifting sling will only break when the actual load exceeds 6 tons.
Meanwhile, Chuanshang Machinery’s NOB‑brand lifting slings always maintain a safety factor of no less than six times.
Not only must the technology meet the required standards, but the product design must also be flawless. So, what makes a good lifting sling? It must:
Safety Tip:
For lifting slings of the same width and weft density, insufficient yarn usage can make the sling more prone to tearing. Additionally, if the webbing is too thin, its abrasion resistance decreases, making it more susceptible to wear. Both of these issues can compromise lifting safety.
Of course, safety requirements in actual operations must not be overlooked. During lifting, as the load accelerates, the tensile force exerted on the sling exceeds the load’s own weight.
Moreover, during lifting operations, abrupt jerks can generate impact forces that exceed three times the object’s weight. Therefore, before selecting lifting equipment, it is essential to carefully account for impact loads. These factors underscore the critical importance of ensuring that slings meet a safety factor of at least six.
In recent years, China’s lifting‑slings industry has experienced rapid growth; however, its technical standards remain far from adequate. Many domestic companies engage in indiscriminate production and arbitrarily alter safety factors, leading to the frequent emergence of substandard, low‑quality products in the market. The most common issue is the reduction in product safety factors, which poses significant risks to lifting operations. Conducting lifting activities with equipment that fails to meet national standards not only increases the likelihood of accidents but also exposes operators to corresponding legal liabilities.
Therefore, both manufacturers and operating users must prioritize their own safety and that of others, strictly adhere to the six‑fold safety factor requirement, and ensure that every lifting operation is absolutely safe.
Chuanshang Mechanical Equipment (Wuhan) Co., Ltd. provides the most comprehensive lifting solutions for every lifting project. Whether it’s product handling, lifting technology, or personnel safety‑training, we offer clients a full‑service experience that leaves no room for concern.
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