Lock cylinder can be counted by the number of rows of balls to identify good or bad. In general, the multi-row row of sub-lock is better than single-row ball lock, multi-row invisible ball lock is superior to the ordinary multi-row ball lock. Class B lock price is much higher than the A-level lock, the majority of manufacturers on the market are producing A-level lock.
B-level lock more anti-theft
???? The use of the cylinder on the market have A-class, B-class, ultra-B-class three, A-class lock core anti-destructive open more than 15 minutes, anti-technical open more than 1 minute. B-level lock anti-destructive open should be greater than 30 minutes, anti-technical open more than 5 minutes. The ultra-B-class anti-theft door lock is the biggest feature of anti-technical open time is greater than 240 minutes.
Hardware accessories is also a good impact on the use of the lock period of a factor. The material of the lock is generally aluminum alloy stainless steel with copper, aluminum alloy slightly worse, copper is best. The same material, the difference is also great, qualified lock workmanship are relatively fine, unqualified products are more rough, qualified lock in the open when the sound is crisp, and unqualified lock surface often scratches the mark, the key to insert It is more loose, open the sound more boring.
Check the A and B by checking the key. If it is a single row of marbles, security door installation is likely to be A-level lock cylinder. If you feel unsafe, you can consider replacing the ultra-B-level cylinder, to improve the overall anti-theft security features.
