GB 17565 is China's national burglar-resistant security-door standard. Class A (甲) is its highest grade. Importers should use the grade to shortlist products, then verify that the certificate covers the exact door leaf, frame, lock and hardware being ordered. This guide explains the four grades, what Class A demonstrates and which documents to request alongside destination-market requirements such as EN 1627.
The Four Grades: A, B, C, D
GB 17565 classifies burglar-resistant doors into four grades by the net working time a skilled attacker with defined tools needs to create an opening: Class A (甲) is the highest, resisting the longest, followed by B (乙), C (丙) and D (丁). The standard also sets minimum requirements for steel thickness, lock point count, and the burglar-resistance level of the lock itself.
What Class A Certifies in Practice
- The longest tested resistance time of any grade under the standard
- Reinforced leaf and frame construction with certified locking hardware
- A tested, higher-grade anti-technical-opening lock and cylinder
- Factory production consistency — the certificate covers the doorset as manufactured
GB 17565 and EN 1627 Together
The two standards use different attack protocols, so there is no official equivalence table — but they answer the same buyer question with independent evidence. The strongest position when importing is a door certified under both regimes: GB 17565 Class A from the factory's home market, plus EN 1627 documentation for yours. Ask for both certificates rather than a verbal claim.
How WONLY Doors Are Graded
WONLY security doors carry GB 17565 Class A — the highest grade — with 200,000+ cycle testing, forced-entry testing and certification to ISO 9001/14001, CE, UL, CMA and CSPA. The company has manufactured security doors since 1996, holds 1,000+ patents and is listed on the Shanghai Stock Exchange (605268), so certification claims are backed by an audited, public manufacturer.
Because the cylinder is part of the tested opening, project buyers should also review the difference between a lock core, cylinder and lock body rather than accepting component names as proof of resistance.
FAQ
Is a Class A door automatically fire-rated? No — fire performance is a separate test (EN 1634 or GB 12955). A door can carry both ratings; confirm each certificate separately.
Should importers outside China care about GB 17565? Yes — it is independent evidence of the factory's engineering level, and Class A certification is a strong filter when shortlisting suppliers.
