Most of the world's security doors are manufactured in China, so the Chinese national standard — GB 17565 — matters to every importer, even ones who specify to EN 1627. This guide explains what the standard tests, what Class A means, and how to use it when sourcing.
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.
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.
