D&D BUILDERS HARDWARE CO. - D&D Builders Hardware Co. is a door closer and hardware manufacturer in Taiwan, produces hardware for doors and windows.

Concealed Door Closer with Sliding Arm | D&D Hydraulic Hardware

Professional concealed door closer with sliding arm. Adjustable size 2-4, 300,000 cycles tested. Suitable for internal & external doors with 5-year warranty.

Slide Channel Concealed Door Closer with Adjustable Spring Force

Hidden hydraulic door closer for internal and external door applications with non-handed installation

Concealed Door Closer with sliding arm - Concealed door closer
  • Concealed Door Closer with sliding arm - Concealed door closer

Concealed Door Closer with sliding arm

DC-D38, DC-D45, DC-M45 series

Slide channel door closer

The DC-D3800 and D4500 door closer are designed for concealed installation in door leaf and door frame. This invisible door closer has the same function as the exposed door closer, but it is hidden in the door and door frame. The conceal door closer is suitable for almost every type of doors including internal and external doors.

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*Forbid selling to Japan: DC-D3800 / D4500 series.

Features
  • Non-handed
  • Available in single size 2, 3, 4 and adjustable spring force size 2~4
  • Separated valves to adjust closing and latching speed
  • Optional hold open clip, can hold a door open at any angle
  • Optional back check function
  • Provide constant closing speed under a wide variety of temperatures
  • 300,000 cycles tested, with 5 years warranty and lifetime after sales service
Specification
  • Main material: aluminum
  • Standard color: silver
Packing details
  • 1 set in 1 box
  • 10 sets in 1 carton
  • N.W.: 18 kg per carton for item no. DC-D3802, DC-D3803, DC-D3804
  • N.W.: 20.5 kg per carton for item no. DC-D3824, DC-D3835
Applications
  • Apply for interior doors and external doors
Photos
E-catalogue Download
Concealed door closer, DC-D/M3845 series
Concealed door closer, DC-D/M3845 series

The DC-D3800 and D4500 door closer are designed for concealed installation in door leaf and door frame. This invisible door closer has the same function...

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How Can Non-Handed Concealed Door Closers Reduce Your Inventory Costs and Installation Time?

Our DC-D3800/D4500 series features universal non-handed installation, eliminating the need to stock separate left and right-hand units. With adjustable spring force (size 2~4) and separated closing/latching speed valves, you can use one product across multiple door weights and applications. This flexibility reduces inventory complexity by up to 50% while ensuring faster installation. Contact us to learn how our OEM/ODM capabilities can customize these concealed closers with your branding for enhanced market differentiation.

Engineered for long-term reliability, our concealed door closers have been rigorously tested to 300,000 cycles and provide consistent closing speed performance under a wide variety of temperatures. Optional features include hold open clips that secure doors at any angle and back check function for enhanced door protection. Each unit comes standard in silver finish with comprehensive packaging (1 set per box, 10 sets per carton) and is backed by our 5-year warranty with lifetime after-sales service. D&D Builders Hardware Co. combines decades of metal processing expertise with precision manufacturing capabilities to deliver concealed door closer solutions that help architects, contractors, and hardware distributors achieve superior building hardware installations with reliable quality and responsive global support.