Door features: (1) frames, doors should be smooth and clean surface of the component, no dents and mechanical damage. (2) nameplate should be upright, firm and clear. (3) anti-theft security doors should be permanently marked level of security. (4) anti-theft security level marked by Chinese symbols and flat circular composition, Chinese code should be in the plane of the circle diameter of Φ25mm. (5) in the form of Times New Roman intaglio permanently fixed to the inside edge of the hinge angle, height 1600mm ± 100mm from the ground position. Sheet and Material (1) sheet materials optional steel, stainless steel, steel / wood, copper or other composite materials. (2) steel sheet thickness a) anti-theft security door according to the B, C, D level should be used separately 2.00mm, 1.80mm, 1.50mm. b) the doors of the outer panel, the thickness of the inner panel with the "outside board / inner board" expressed in the form, according to anti-theft security of B, C, D level should be used separately 1.00mm / 1.00mm, 0.80mm / 0.80mm, 0.80mm / 0.60 mm. c) sheet thickness Grade security doors under conditions consistent with its anti-sabotage performance, according to the thickness of the product design choices. If you choose a steel plate thickness shall not be less than B-level anti-theft security door, door leaf thickness and tolerance requirements. Fail Fail security door, by definition less than the national standard anti-theft door. Unqualified security door on the market variety, as long as consumers keep a calm mind. Do not tempted by the low price of the door. Basically not buy substandard security door. First pick the lock cylinder, watching the door key. Key "teeth" more deeper, more complex arrangement indicates that the door to open more difficult. Second, look at the color of the door. Good quality locks are electroplated handling, gloss and smoothness are good, which should be a deep yellow color if the copper, this material is relatively strong, so the protection is better. Third, look at the weight of the door lock. The heavier the weight of the cylinder material better description, the better the quality of the lock cylinder, the more cylinder inside the beads, better lock protection performance. Iron machining, sheet metal processing Changzhou, residential fence processing www.pjxdbjc.com