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| Item | Grade 4 (Class A · Top) | Grade 3 (Class B · Mainstream) | Grade 2 (Class C · Basic) | Grade 1 (Class D · Entry) |
|---|---|---|---|---|
| Anti-destruction time | ≥30 minutes | ≥15 minutes | ≥10 minutes | ≥6 minutes |
| Number of locking points | ≥12 | ≥10 | ≥8 | ≥6 |
| Door frame plate thickness | ≥2.0mm | ≥2.0mm | ≥1.8mm | ≥1.5mm |
| Outer door leaf thickness | ≥1.0mm | ≥1.0mm | ≥0.8mm | ≥0.8mm |
| Inner door leaf thickness | ≥1.0mm | 0.8-1.0mm | ≥0.8mm | ≥0.6mm |
| Lock cylinder level | Grade C (Super B) | Grade C / B | Grade B / A | Grade A |