1、Load-Bearing Matching: The total load-bearing capacity of hinges must be ≥ 1.5 times the door weight (e.g., for a 50kg door, select a hinge set with total load-bearing capacity ≥ 75kg) to avoid deformation during long-term use.

2、Compliance with Standards: Fire doors must use fire-rated hinges with fire protection certification, complying with GB 12955-2008; export products shall meet CE or ANSI standards.

3、Process Details: High-quality hinges feature uniform surface electroplating (no bubbles or scratches), smooth pin rotation (no jamming), and secure screws without stripping.

4、Brand & Quality Assurance: Prioritize hinges produced by source factories (e.g., Jusen, DTC, Higold) with a warranty period ≥ 3 years (≥ 5 years for core components such as hydraulic dampers).

5、Bulk Selection: Request samples before bulk procurement to test opening/closing smoothness, load-bearing capacity, and buffering performance (e.g., hydraulic hinges should show no oil leakage after 100 opening/closing cycles).