King NSK 850 Hydraulic Overhead Door Closer (Made in Korea):
- Technical Specifications: Recommended door weight capacity 40 to 65 kg (door width up to 950 mm), power size: EN Size 3 equivalent, body material: high-pressure die-cast aluminum body with internal rack-and-pinion mechanism, dual independent hydraulic regulating valves (Speed 1: Closing speed from 180° to 15°, Speed 2: Latching speed from 15° to 0°), hold-open function: 90° hold-open arm (holds door open at 90° for ventilation/loading), high-viscosity anti-freezing hydraulic fluid (-30°C to +50°C), universal non-handed installation (left or right swinging doors), Product of King Door Closer Co., Ltd. Korea.
- Smooth Hydraulic Controlled Closing: Softly pulls doors shut without slamming, protecting glass panels and door frames from violent impact shock.
- Dual-Stage Independent Speed Regulation: Two precision brass needle valves allow independent adjustment of main closing sweep and final latching speeds.
- Convenient 90-Degree Hold-Open Arm: Holds the door open automatically at 90° for carrying heavy cargo pallets or airing out rooms.
- High-Grade Anti-Freeze Hydraulic Oil: Maintains smooth, consistent closing speed in cold winter drafts without seasonal re-adjustments.
- High-Pressure Die-Cast Aluminum Body: Built for over 500,000 continuous door opening cycles in busy public buildings.
- Applications: Commercial office doors, wooden fire escape doors, residential entrance doors, hospital clinics, and hotel guest room doors.
