SJ Group, Expert of Precision Manufacturing Service


SJ Group, the successor of Weilin Molds Co., Ltd., was founded by its President Mr.Wing. Lo in Hong Kong China in 1987. Beginning with the R&D and manufacture of precision injection molds, it has been focusing on precision manufacturing for 27 years. To maximize customer value, SJ Group constantly advances with the times and adopts the cutting-edge technologies to make itself a pioneer of precision manufacturing.

Ever since it was founded, the Group has stuck to the product conception of "Excellent Appearance and Superb Quality” in addition to scientific and rigorous professional attitude for maximal satisfaction of the customers. SJ Group is serving global clients, most of which are leaders in different industries, including GM, Mercedes-Benz, Toyota, Volkswagen, BMW, Jaguar, Lotus, Ford, HP, Canon, Unilever, HUSKY, Jokey and Rubbermaid.


Considering market opportunities and challenges from industrial development, the 5 subsidiaries of SJ Group (SJ Automotive, Thin-wall Solution, SJ Wuxi, SJ North America and SJ Europe) focus on R&D and innovation in each specified market, constantly increase investment and provide the global customers with quality, timely and professional precision manufacturing service with more high-end production and testing equipment, a perfect management system, a high sense of responsibility and a skillful team.

SJ Group has passed certification of ISO9001:2008, TS16949:2009 and ISO13485:2003 Quality Management Systems and acquired qualification certificates. In 2013, it was entitled as “National Hi-tech Enterprise”.

SJ Automotive

SJ Automotive is a joint venture founded by SJ Group in Shenzhen, specializing in the manufacture of large and medium-sized molds. Its products are mainly used in the automobile industry and the household appliance industry. It is dedicated to serving top auto parts distributors in the world with advanced design ideas, experienced design talents, modern processing equipment and standardized management system.



Thinwall Solution

Thinwall Precision is a wholly-owned subsidiary of SJ Group, specializing in the R&D and manufacture of thin-wall packagings, daily chemicals, medical consumables and extremely high-precision molds as well as in-mold-labeling (IML) solutions for the customers.



SJ Wuxi  

SJ Wuxi is a cooperative company founded by SJ Group in East China, specializing in the high-precision injection molding for the customers in East China. The services cover precision electronics, precision auto parts, medical supplies, food packaging, daily chemical packaging, etc.



SJ Euro

SJ Europe is a joint venture founded by SJ Group in Netherland, specializing in the R&D, technical support and after-sales service of precision multi-cavity molds and large/medium-sized auto molds for European customers. Its services cover thin-wall packaging, cosmetic packaging, medical consumables, automobile and many other fields.



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