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About product and suppliers:
        Alibaba.com offers 14,325 screw jack products. About 22% of these are car jacks, 14% are speed reducers, and 11% are ladder & scaffolding parts. 

A wide variety of screw jack options are available to you, such as worm, cycloidal, and bevel / miter. You can also choose from free samples, paid samples. 

There are 14,479 screw jack suppliers, mainly located in Asia. The top supplying countries are China (Mainland), India, and Taiwan, which supply 93%, 4%, and 1% of screw jack respectively. 

Screw jack products are most popular in North America, Southeast Asia, and Domestic Market. 

You can ensure product safety by selecting from certified suppliers, including 5,385 with ISO9001, 1,505 with ISO14001, and 1,255 with Other certification.