Window locks

Selecting the correct lock depends entirely on the window's opening mechanism. For sliding windows, prioritize sliding sash locks or wedge locks that prevent the track from moving. For casement windows (crank-out), locking handles or bolt locks are essential. If you are sourcing for double-hung windows, sash fasteners with a cam-action mechanism provide the best security by pulling the sashes together to eliminate gaps. Always ensure the material is corrosion-resistant zinc alloy or stainless steel for longevity.

For the US market, look for products that meet ASTM F588 standards for forced entry resistance. In the UK and Europe, compliance with BS EN 13126 or PAS 24 is often required for insurance purposes. Additionally, for child safety, ensure the locks can act as window restrictors, limiting the opening to less than 100mm (4 inches) to prevent falls while still allowing ventilation, complying with ASTM F2090.

Focus on the tensile strength of the locking bolt and the pick-resistance of the cylinder if it is a keyed lock. High-quality locks should withstand at least 200-300 lbs of force. For commercial projects, specify powder-coated finishes with a salt spray test rating of at least 96 hours to prevent rusting in humid or coastal environments. Key-alike systems are also a major technical requirement for B2B buyers to allow one key to open all locks in a single property.

Calculate the Total Cost of Ownership (TCO) by factoring in the unit price, shipping volume (locks are heavy, so high-density packing is key), and installation time. Sourcing locks with universal mounting holes can reduce labor costs during installation. Seek suppliers on Made-in-China.com who offer tiered pricing, where moving from 500 to 2,000 units can often reduce the unit cost by 15-25%.

The primary risk is material substitution, where a supplier might use cheaper aluminum scrap instead of high-grade zinc alloy, leading to brittle locks. To mitigate this, request a Material Test Report (MTR) and use third-party inspections (like SGS or Intertek) to perform a drop test and torque test before the final balance payment is made.

Focus your negotiation on mold ownership and customization (OEM). If you require a specific logo or a unique color like 'Antique Bronze,' clarify who owns the tooling. Demand a Golden Sample before mass production. For payment security, always utilize secured payment terms and clearly define the Lead Time in the contract, including penalties for delays exceeding 14 days.

Since window locks are small but heavy, Sea Freight (LCL) is the most cost-effective method for bulk orders. Ensure the supplier uses reinforced double-corrugated export cartons and pallets with plastic wrap to prevent moisture damage during sea transit. For urgent samples, International Express (DHL/FedEx) is preferred, but ensure the supplier provides the HS Code (typically 8301.40) to expedite customs clearance.

Verify the supplier's Business License and Export Qualification on the platform. Ensure the proforma invoice matches the bank account name of the registered company. Stay updated on Anti-Dumping Duties; some regions impose higher tariffs on Chinese steel/aluminum hardware, so check your local Customs Tariff Schedule to calculate the accurate landed cost.