Lock is the heart of the security door, no matter how many burglary-resisting door lock, door how strong, as long as the lock open, can open the door. To guard against theft complaint till now, no damage, no traces of technical unlock ratio greatly ascend.

Technical indicators and classification

According to the latest related regulations of "mechanical anti-theft lock" in our country, the main technique index sign of the mechanical anti-theft lock core, so far, China's national standards about the lock core is limited to class A, class B and class C three, super class B is lock manufacturing enterprises put forward the standard.

A: A, eligibility criteria for technical opening more than 1 minute.

Two: B, eligibility criteria for technical opening for more than 5 minutes.

Level 3: C, a lock is monitoring by the related departments to technology is unable to open or opened more than 270 minutes as the standard. I company for the domestic first level technical appraisal by the ministry of public security prevention technology open C enterprise. Super class B lock core category on the market at present various, to pretend to be class C.

Criminals at the traditional class A lock, and the degree of difficulty of technical opening B class lock is opposite bigger, criminals to meet A super class B and class C lock, generally ignored. Only in raising the level of locks, increase the difficulty of the technical unlock, extend the lock time, can effectively protect the people's life and property safety

The choose and buy of the lock core standards

The security lock has been upgraded to class B and class C, choose and buy when had better choose C level.

Before the first recruit: buy a lock to see how many to judge the stand or fall of lock key bit, basically be to see the structure of the lock core, blade edge pillar type structure is often better than traditional marble structure, pick the lock when had better look for professional teacher again after according to circumstances to choose.

The second recruit: jin say two pick lock theory, a weight than two lock. About weight, the quality of the lock core, the better, the more beads inside the lock, alarm function, the better.

Three recruit: choose lock to see color, than the color look at work. Quality good lock the plating processing, the surface is smooth, colour and lustre is bright. Lock colour and lustre is dim, grey color bubbles is zinc alloy, anti-theft performance.

Fourth recruit: insert the key lock stuck anti-theft performance is poor, keys and a half after insertion, in 5 to 7 component clockwise or counter-clockwise and continue to press the key into the lock, the card key lock anti-theft performance is poor, the smooth state into the half spin lock anti-theft effect is good.