Magnet lock

The holding force is the most critical specification. For low-security interior doors, a force of 300 lbs (150kg) is sufficient. For standard office entry points, prioritize 600 lbs (280kg) models. For high-security perimeters or heavy fire doors, you must select locks with at least 1200 lbs (500kg) to 1500 lbs of holding force to ensure the door cannot be forced open manually.

Ensure the lock supports dual voltage (12V/24V DC) to match various access control panels. It is vital to verify the current draw (typically 300-500mA) to prevent overloading power supplies. Additionally, look for models with built-in MOV (Metal Oxide Varistor) surge protection to prevent back-EMF from damaging sensitive electronic controllers.

For the US market, products must be UL 10C listed (for fire-rated doors) and comply with FCC Part 15. For the EU, CE marking and RoHS compliance are mandatory. If the locks are used on emergency exits, they must meet fail-safe requirements, meaning they automatically unlock during a power failure to ensure life safety.

The housing should be made of high-strength anodized aluminum, while the electromagnetic plate should feature anti-residual magnetism treatment. This treatment ensures the door releases instantly when power is cut. For outdoor or humid environments, specify an IP65 or IP68 waterproof rating and stainless steel casing to prevent corrosion.

Residual magnetism can cause doors to stick even after power is cut. To mitigate this, request a sample test specifically for the 'instant release' function. Negotiate a quality guarantee clause in your contract that specifies a maximum release delay (e.g., <1 second) and ensure the supplier uses pure iron armatures rather than low-grade alloys.

When sourcing via Made-in-China.com, focus on OEM/ODM capabilities if you require custom branding. Ask for tiered pricing based on volume; typically, a 15-20% discount is achievable for orders exceeding 500 units. Always confirm if the mounting brackets (L, U, or Z brackets) are included in the unit price or sold separately to avoid hidden costs.

Use Secured Trading services on the sourcing platform to hold payments until shipping documents are verified. Since magnet locks contain powerful magnets, they are classified as 'Magnetic Goods' for air freight. You must ensure the supplier provides a Magnetic Inspection Report and uses shielded packaging to comply with IATA regulations, or opt for sea freight to reduce logistics complexity and costs.

Hire a third-party inspector to perform a pull-force test using a hydraulic pressure gauge to verify the advertised holding force. Also, check the surface finish for scratches and verify that the wiring diagrams and installation templates are included in every box in the correct language for your target market.