Replacing old door knobs starts with checking the existing door preparation. Remove the screws, separate both knobs, then remove the latch. Measure door thickness, bore diameter, backset, spindle, and latch faceplate before choosing a replacement.

Install the New Knob

Insert the latch with its bevel facing the closing direction. Feed the exterior spindle through the latch, align the interior knob, and tighten both sides evenly. Test rotation, latch return, and door closing. Binding often indicates an incorrect backset or misaligned strike plate.

EN 1906:2012 covers operating torque, free play, durability, static strength, safety, and corrosion resistance for door knobs and Lever Handles. EN 1670 evaluates corrosion resistance through neutral salt-spray testing.

Manufacturer Control for Projects

Hotels, apartments, offices, and housing projects require consistent dimensions, functions, and finishes. A manufacturer controls material selection, forming, CNC machining, polishing, coating, assembly, and testing. A trader relies more on external production for technical changes and batch consistency.

Established in 1994, we provide OEM and ODM services with a published monthly capacity of up to 800,000 pairs or sets. Our process covers drawing review, finish confirmation, sample approval, production, inspection, and export packing.

Project Sourcing Checklist

Confirm door thickness, bore size, backset, spindle, latch type, handing, material, finish, lock function, packaging, and spare parts. Quality checks should cover dimensions, spring return, torque, corrosion performance, assembly fit, and carton protection. Export orders should match EN 1906, EN 1670, CE, RoHS, labeling, and destination-market requirements.