2BB 4BB Ball Bearing Hinges

Key Features

• Premium Stainless Steel Material
  Made from high-grade stainless steel (SS201 / SS304 / SS316 available). Excellent rust and corrosion resistance – ideal for interior, exterior, and even marine environments.

• Ball Bearing Technology (2BB / 4BB)

  • 2BB (Two Ball Bearings): Smooth operation for light to medium doors. Reduces friction between knuckles.

  • 4BB (Four Ball Bearings): Extra smooth and heavy‑duty performance. Designed for high‑traffic doors and heavy door leaves.
    Both options ensure silent, long‑lasting, and wear‑resistant hinge action.

• 4 Inches Standard Size
  4 inch (102mm) height, the most common size for residential and light commercial doors. Fits standard door thickness (35mm–45mm) and frame preparations.

• Flat Open Butt Hinge Design
  Traditional rectangular leaves with square or radius corners. Flush mounting on door edge and frame jamb – clean, professional look.

• High Load Capacity
  Thick leaves (2.0mm–2.5mm) and hardened stainless steel pin. 4BB model supports up to 70kg per hinge (use 2–3 hinges per door).

• Low Maintenance & Durable
  Ball bearings are lubricated and sealed. No squeaking or binding over thousands of cycles. Tested for 100,000+ open/close cycles.

• Easy Installation
  Pre-drilled screw holes (usually 4 holes per leaf). Comes with matching stainless steel wood screws or machine screws (for metal frames).

• Wholesale / Bulk Supply
  Factory direct – ideal for door manufacturers, hardware wholesalers, construction projects, and export orders. Competitive pricing from 1000 pairs up to container loads.

 Common Applications

• • Residential Doors
    Bedroom doors, bathroom doors, kitchen doors, closet doors, and main entry wooden doors (with 3 hinges per door).

  • Commercial Buildings
    Office doors, meeting room doors, hotel guestroom doors, school classroom doors, hospital patient room doors.

  • Light Industrial Use
    Warehouse office doors, workshop entry doors, storage room doors.

  • High‑Traffic Areas
    4BB hinges recommended for doors that open/close frequently – apartment building common doors, restaurant kitchen doors, retail store back doors.

  • Fire Rated Doors
    When paired with appropriate intumescent screws/pads, these hinges can be used for fire door assemblies (check local codes).

  • Upgrade or Replacement
    Perfect replacement for worn‑out residential hinges. Fits standard 4″ hinge cutouts (4″ x 4″ leaf size approx. 102x102mm).