Grade standard: The security grades of security doors are divided into A, B, C and D, among which A has the highest anti-theft performance, followed by B and C, and D is the lowest. What we see in the building materials market are mostly C-class and D-class security doors, which are more suitable for ordinary families.

Extended data:

The General Technical Conditions for Anti-theft Safety Door, which has been implemented for 8 years, will be implemented in the new national standard from April 1 2008. According to the new national standard, the security level of security doors is divided into four levels: A, B, C and D. The security performance of security doors with different security levels is different, and the damage prevention time of security doors should not be less than 6 minutes.

The new standard is mandatory for the relevant clauses of security performance of security doors. According to the index of loss-proof length and plate thickness, the standard classifies the anti-theft safety grade of anti-theft door products. The new standard improves the security level of theft prevention from the original "C", "B" and "A" to "A", "B", "C" and "D".

The phonetic alphabet codes of the new anti-theft security level are "J", "Y", "B" and "D" respectively. A is the highest level and decreases accordingly.

Different anti-theft grades of anti-theft doors have different anti-theft safety performance. Such as loss prevention time: the first-class security door shall not be less than 30 minutes, the second-class security door shall not be less than 15 minutes, the third-class security door shall not be less than 10 minutes, and the fourth-class security door shall not be less than 6 minutes.

The number of locking points between the door frame and the door leaf shall be no less than 12, 10, 8, 6 A, B, C and D security doors respectively; The steel plate thickness of the door frame shall be 2mm, 2mm, 1.8mm and 1.5mm respectively. Consumers can choose the security door they want according to their needs.

According to the new standard, the lock of anti-theft door should be able to open the door leaf within the anti-destruction time, even if the lock core is drilled, the lock body connector is pried open to unlock, or the lock tongue is loose through the upper and lower gaps. The effective length of the main lock tongue of the security door should not be less than 16mm, and there should be a lock tongue stop device.

Baidu encyclopedia-anti-theft door