Overview
Achieve minimalist architectural sightlines in modern residential and commercial interiors with the Ultra-Thin Concealed Hydraulic Overhead Door Closer. Featuring an ultra-slim extruded aluminum body engineered for mortised, slotted installation into the top edge of interior door leaves and jambs, this invisible door closer remains completely hidden when the door is closed. Equipped with an integrated 90° hold-open positioning function, anti-freeze leak-proof hydraulic fluid, and two-stage speed regulation valves, it provides reliable, silent door control for interior doors weighing up to 85 kg (187 lbs).

Key Features

• Ultra-Thin Invisible Concealment: Streamlined, narrow mortise body profile and low-profile slide track fit neatly into standard door leaves, preserving clean architectural aesthetics without visible surface hardware.
• Integrated 90° Hold-Open Positioning: Features an internal mechanical hold-open block within the slide rail track that holds the door securely open at 90° for easy passage and room ventilation, releasing with a gentle pull.
• Leak-Proof All-Weather Hydraulic System: High-performance sealed hydraulic cylinder with premium anti-freeze fluid ensures consistent closing damping force across cold and warm ambient temperatures.
• Dual Independent Speed Regulating Valves:
  • Closing Speed Valve (120° to 15°): Regulates smooth, controlled approach speed to prevent drafts and rapid swinging.
  • Latching Speed Valve (15° to 0°): Fine-tunes final soft latching power to overcome door latch resistance quietly without slamming.
• Heavy-Duty 85 kg (187 lbs) Capacity: Engineered with high-strength alloy internal gearing providing robust self-closing force for doors ranging from 40 kg to 85 kg (88 to 187 lbs) and widths up to 1050 mm (41.3 in).
• Universal Non-Handed Mounting: Symmetrical mortise design compatible with both left-hand and right-hand swinging doors.

Technical Specifications

• Product Type: Ultra-Thin Concealed Overhead Hydraulic Door Closer
• Primary Material: High-Strength Extruded Aluminum Alloy Body & Steel Slide Rail
• Finish: Satin Anodized Silver / Anti-Oxidation Treatment
• Door Weight Capacity: 40 kg to 85 kg (88 lbs to 187 lbs)
• Applicable Door Width: 750 mm to 1050 mm (29.5 in to 41.3 in)
• Minimum Door Leaf Thickness: 40 mm (1-9/16 in) required for mortise slotting
• Maximum Opening Angle: 120° (with 90° mechanical hold-open positioning)
• Speed Regulation: 2 Independent Valves (Closing: 120°–15°, Latching: 15°–0°)
• Operating Life: Tested to 300,000+ opening and closing cycles
• Recommended Applications: Hotel guest rooms, modern apartments, minimalist interior wooden doors, office entrances, and concealed pivot doors

Wholesale & OEM Capabilities

• B2B Commercial Supply: Direct factory manufacturing for door fabricators, interior contractors, architectural hardware distributors, and hospitality procurement projects.
• OEM/ODM Customization: Non-hold-open slide track options, custom faceplate finishes (Matte Black, Champagne Gold, Gunmetal), custom laser-etched branding, and bespoke packaging.
• Export Packaging: Individual protective shock-absorbent packaging inside reinforced corrugated export master cartons with 1:1 scale routing installation templates.