Round door lock

When sourcing round door locks, you must prioritize the ANSI/BHMA Grade (Grade 1 for heavy-duty commercial, Grade 2 for light commercial, and Grade 3 for residential). Key technical factors include the backset size (typically 60mm or 70mm), door thickness compatibility (usually 35mm-45mm), and the material of the cylinder, where solid brass is preferred for durability and pick resistance. Additionally, ensure the latch bolt has a throw of at least 1/2 inch for basic security.

For long-term durability, especially in humid environments, Stainless Steel 304 (SS304) is the industry standard due to its high corrosion resistance. If a decorative finish like gold or matte black is required, ensure the supplier uses PVD (Physical Vapor Deposition) coating or electroplating with a salt spray test rating of at least 48-72 hours to prevent peeling and oxidation over time.

Compliance varies by destination: for the US market, products should ideally meet UL 10C (Fire Rating) and ANSI/BHMA A156.2 standards. For the European market, look for EN 12209 certification and CE marking. If you are sourcing for public buildings, ensure the locks meet ADA (Americans with Disabilities Act) requirements, though lever handles are often preferred over round knobs for accessibility compliance.

Request technical drawings showing the internal structure. High-security round locks should feature anti-drill plates, pick-resistant pins (spool or mushroom pins), and a concealed screw design on the exterior rose to prevent forced removal. Ask the supplier for a cycle test report; a quality lock should withstand at least 200,000 to 400,000 cycles without mechanical failure.

Always request a pre-production sample and a Golden Sample for sealing. Utilize third-party inspection services (like V-Trust or SGS) to perform a During Production Check (DUPRO) and a Final Random Inspection (FRI). Focus the inspection on torque testing, key fluidity, and plating thickness to ensure the bulk matches the approved sample.

Focus on Total Cost of Ownership (TCO) rather than just the unit price. Negotiate based on volume tiers (e.g., 500, 1000, 5000 units) and ask for spare parts (1-2% extra cylinders or latches) to be included at no cost. For long-term partnerships, request OEM/ODM customization for branding on the keys and packaging, which adds value to your retail presence.

Use Secured Trading Services provided by Made-in-China.com to ensure payment safety. Opt for a payment structure of 30% deposit and 70% balance against the Bill of Lading (B/L) after a successful inspection report. Avoid using private bank accounts; always ensure the beneficiary name matches the company name on the audited supplier profile.

Round door locks are heavy and dense, making Sea Freight (LCL or FCL) the most economical choice. To prevent damage and moisture during transit, insist on double-corrugated export cartons and palletization with moisture-proof shrink wrap. Ensure the supplier provides a detailed packing list and HS Code (typically 8301.40) to streamline customs clearance in your home country.