Recommended model: 988ASN
 
Sanhuan is the oldest lock manufacturer in China, and it is also the only "China time-honored brand" lock enterprise, its predecessor Shunji lock factory was established in 1930, the first lock factory in China. As one of the main drafting units of the industry standard GA/T 73-2015 "Mechanical Anti-theft Lock", the brand strength of Sanhuan should not be underestimated.
 
Shandong Province is one of the important hardware product manufacturing bases and sales centers in China, and the advantages of the three rings combined with the region are developing rapidly. And as a typical northern lock manufacturer, Sanhuan mainly produces padlocks and various vehicle locks, which are different from all kinds of door locks from southern manufacturers. In 2017, Sanhuan Auto Lock Lock reached 20% of the national market share, and also joined GM's global GEM project.
 
It can be seen that the exterior door lock is a small category that is not valued in the Sanhuan product line, and only 5 products are listed on its official website. Four of the five exterior latches still use traditional cross keys, which are the lowest security Class A cylinders in the industry standard, and the material and thickness of the lock case also lack highlights, so they are not recommended here. The 988ASN with slightly better overall performance is the crescent key, and the official lock cylinder level is not indicated, but the complexity of the alveolar tooth flower of the key is not high, so it can be inferred that the security will not be too high, and it is only recommended for basic protection in an access control environment. In addition, the exterior door locks of the third ring are easier to buy offline, and the price is generally not more than 100 yuan.