The B-class lock core is more anti-theft. At present, the lock cores used in the market have three grades: A grade, B grade and super grade B. The anti-destructive opening of the A-class lock cylinder is greater than 15 minutes, and the technical opening is more than 1 minute. The anti-destructive opening of the Class B lock should be greater than 30 minutes, and the technical opening should be greater than 5 minutes. The biggest feature of the Super B-class anti-theft door lock is that the anti-technical opening time is more than 240 minutes.

"The lock cylinder can also be identified by the number of marbles. In general, multi-row marble locks are superior to single-row marble locks. Multi-row stealth marble locks are superior to ordinary multi-row marble locks." The master told the author that since the B-level locks are much more expensive than the A-class locks, most manufacturers on the market produce Class A locks. The public can check the key of their own security door. If it is a single row of marbles, the security door is probably installed with a Class A lock cylinder. If the public feels unsafe, they may consider replacing the Super B-class lock cylinder to improve the overall anti-theft performance of the security door.

In addition to the lock core, there are hardware accessories. “Materials are generally aluminum alloy, stainless steel and copper. The aluminum alloy is slightly worse, copper is the best, but the price of the lock is also the highest. What is important is that even if copper is used, the difference in the material of the lock is very large, and it is difficult for consumers to distinguish. The salesperson said that the only way for consumers to distinguish is experience. The qualified locks work finer, the unqualified products look rougher, the qualified locks are very clear when opened, and the unqualified locks often have surfaces. Traces of scratches, the key insertion seems loose, and the opening sound is dull.

Editor in charge: Sun Gongxue