NHN 1638 Concealed Door Closer

NHN 1638 Concealed Door Closer

The NHN 1638 is an ultra-slim concealed hydraulic door closer for internal doors requiring hidden door control. Its 28 mm body is suitable for thin aluminium, steel and wooden doors and is designed to maintain a clean appearance when the door is closed.

Technical specifications

• Model: 1638 / 1638U
• Body width: 28 mm
• Applicable door size: up to 950 × 2100 mm
• Door weight: 40–60 kg
• Opening angle: 180°
• Hold-open: Yes
• Sweep speed adjustment: Yes
• Latch speed adjustment: Yes
• Concealed arm: Yes
• Installation: standard or reverse
• Application: internal doors

Design and operation

The concealed body and arm preserve a streamlined door appearance. Hydraulic operation provides controlled closing, while the closing speed and hold-open angle can be adjusted for the installation.

SEO article

The NHN 1638 concealed door closer combines an ultra-slim 28 mm body with concealed hydraulic door control for modern internal doors. It is designed for aluminium, steel and wooden doors where visible door hardware would compromise the architectural appearance.

With a recommended door size of up to 950 mm and door weights of approximately 40–60 kg, the NHN 1638 provides controlled closing with adjustable sweep and latch speeds. Its 180° opening capability and hold-open function add practical flexibility, while standard and reverse installation options support different door constructions.