Overview
Engineered for minimalist architectural millwork, flush interior timber doors, and luxury hidden door systems, the Heavy-Duty 3D Adjustable Concealed Hinge (133x20 mm) delivers a completely invisible appearance when the door is closed. Featuring a reinforced four-axis zinc alloy support arm and high-precision steel linkage, this concealed mortise hinge allows effortless 180° full-swing clearance. With its integrated three-dimensional adjustment mechanism, installers can fine-tune door alignment across vertical, horizontal, and depth planes without removing the door leaf from the jamb.

Key Features

• Completely Concealed Flush Aesthetic: Square-head mortise profile installs fully inside the door leaf and jamb, vanishing completely when closed for seamless flush wall integration.
• Full 180° Swing Clearance: Four-axis linkage arm geometry allows wide-angle opening up to 180° without binding against adjacent trim or casing.
• True 3D Independent Adjustability:
  • Vertical (Up/Down): ±2.5 mm adjustment via precision Allen socket screws.
  • Horizontal (Left/Right): ±2.0 mm adjustment for exact frame reveal gaps.
  • Depth (In/Out): ±1.0 mm compression adjustment for superior acoustic and draft gasket sealing.
• Heavy Load Capacity: Rated for up to 80 kg (176 lbs) per pair (2 hinges), or 100 kg (220 lbs) when using 3 hinges on taller architectural doors.
• Quiet Four-Axis Zinc Alloy Linkage: High-density zinc alloy construction with self-lubricating POM composite bushings ensures silent, friction-free operation and long service life.
• Sleek Snap-On Cover Plates: Includes matching screw cover plates that conceal all mounting screws and adjustment hex sockets for a clean, professional finish.

Technical Specifications

• Product Type: 3D Adjustable Concealed Invisible Door Hinge (Square Head / Four-Axis)
• Dimensions: 133 mm (Length) × 20 mm (Width) / 5.24" × 0.79"
• Body Material: High-Density Zinc Alloy Arm & Zinc Die-Cast Body with Stainless Steel Pivot Pins
• Finish Options: Matte Black, Satin Silver / Brushed Chrome
• Load Bearing Rating: 80 kg (176 lbs) per 2 hinges / 100 kg (220 lbs) per 3 hinges
• Opening Angle: 180° Maximum Full-Swing
• Door Thickness Compatibility: Minimum 35 mm (1-3/8") to 50 mm (2") solid core and engineered wooden doors
• Door Handing: Universal Non-Handed (Field-Reversible for Left-Hand or Right-Hand Swing Doors)
• Applications: Concealed jib doors, flush interior wooden doors, luxury residential secret doors, folding partition panels, and high-end commercial cabinetry

Wholesale & OEM Capabilities

• B2B Project & Millwork Distribution: Factory-direct supply for architectural door manufacturers, commercial millwork contractors, and interior hardware wholesalers.
• OEM Custom Finishes: Custom finishes including Brushed Brass, Gunmetal Gray, Oil-Rubbed Bronze, and custom private-label laser etching.
• Export Packaging: Individual blister packaging or protective foam-lined inner boxes with hex keys, stainless steel mounting screws, and master export cartons.