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Sling CahinRegulation law of Ordinance on Industrial safty and health has revised on June,1998. In this revision, the change of design safety factor of chains was inclued. If a chain will be able to make clear of requests of regulation, we can use 4 as safty factor. Then we can use more fine chains. In Japan, untill then, we must use 5 as safty factor in chain design but in foreign countries, they have used 4 as safty factor which had been decided by ISO. By this revision of regulation, we become to be able to produce chains in same design level. This table shows general lifting chain (grade 80) as a for instance.
If said lifting chain fits all items showed as bellow, you can use 4 as a safty factor in design.
１．In tensile test by 1/2 load of braking load, its extend ratio should be less than 0.5%.
２．It has extension (stated value) which required in braked conditon, to meet its tensile strength.
（Regulation law of Labour, safty and health; Article 164 and 469.）
This is applied to chains which is designed due to JIS B 8812 and B 8816.
Safty factoe ＝Braking load ／Working Load Limit
WLL ：Working Load Limit
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