Table – Working Load Limits (WLL) for Chain Chain Size in millimeters (inches) Unmarked Chain Grade 30 proof coil Grade 43 high test Grade 70 transport Grade 80 alloy Grade 100 alloy Chain Marking None 3, 30, 300 4, 43, 430 7, 70, 700 8, 80, 800 10, 100, 1000 7mm (1/4in) 580kg (1,300lb) 580kg (1,300lb) 1,180kg

2014年9月30日 · Chains have a working load limit- or WLL- of approximately one third of their break strengths (the amount of force the chains can withstand before they break). How to Find the Working Load Limit. The chain grade and diameter determines the working load limit of the chain.

2018年4月23日 · Working load limit (WLL) of a chain is another designated safety measure. WLL is a weight significantly less than the weight that would cause a chain to fail (tensile strength). WLL = MBL / SF. Where MBL is the minimum breaking load and SF is the safety factor. A safety factor is the ratio between allowable stress and actual stress.

2020年2月20日 · For example, G80 means that the maximum stress on the chain at ultimate strength is 800 newtons per millimeter squared. Working Load Limit (WLL) of Chain. The other safety measure was identifying which types of chain are appropriate and strong enough for overhead lifting. Anytime we move or lift a load it is dangerous.

2025年1月19日 · A chain’s working load limit (WLL) represents the maximum weight a chain can safely handle during operation. You calculate it by dividing the chain’s minimum breaking strength by a safety factor (typically 5:1 for industrial chains, 4:1 for overhead lifting chains, or 3:1 for general-purpose chains).

The working load limit (WLL) of a chain is a safety precaution to prevent this from happening. Here’s what you need to know about the WLL, how it is calculated, and how to work with it in your industrial application.

This chart applies to general purpose chain slings made of chain and components manufactured to I.S.O grade 80 & 100, EN818 or equivalent International standards. For ratings of special purpose slings consult your local cookes branch.

2021年7月27日 · Protect tie-downs from damage when in contact with edges, protrusions or abrasive surfaces. Never exceed the working load limit (WLL) of the tie-down; taking into account the load, vehicle anchor points and the tie-down configuration and angles. User must be alert to any and all hazzards when securing cargo.

What is the aggregate WLL of one 7/15 inch Grade 43 chain, and three 5/16 inch Grade 70 chains? Prevent forward movement of cargo. Attach a tiedown to. Place against or around an article to prevent horizontal movement of the article. …

View the working load limits to be used when the cargo tiedown material is not marked by the manufacturer with the working load limit.