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Shanghai Dalong Chain Factory Co., Ltd. was formerly a subordinate workshop of Dalong Machinery Factory established in 1902. Since 1954, it has supplied precision petroleum drilling rig chain for the petroleum industry. In 1977, it developed and produced the first escalator step chain in China. In 2002, it was the first in China. American Petroleum Institute 7F standard certification.

The company has an excellent sales team, and proposes suitable solutions for different customers; professional design team, professional testing equipment, excellent production team.

There are 400 tons and 600 tons of large stamping equipment, automatic / semi-automatic parts processing equipment, automatic / semi-automatic assembly equipment, automatic welding equipment, to meet the production of various specifications of the chain.