Attributes

Brand	-
Category	Basic Building Materials / Floor Springs
Origin	-
Model Number	N-818
Maximum Door Weight	160 kg
Material	Heavy-Duty Steel Alloy
Finish	Silver Chrome Plated
Applicable Door Type	Glass and Framed Wood Doors
Installation Method	Floor Embedded / Surface Mount
Closing Speed	Adjustable Two-Stage
Opening Angle	Up to 90 Degrees
Durability Rating	500,000 Cycles Tested
Warranty Period	2 Years Manufacturer Warranty

6 reviews

Anonymous

Mar 27, 2026

Rating: 4/5

Solid build quality

The unit feels very robust and well-made. Installation instructions could be slightly clearer, but once set up, it works perfectly. The adjustable speed is a great feature.

Anonymous

Mar 23, 2026

Rating: 4/5

Reliable heavy-duty solution

Does exactly what it says on the tin. Supports our solid wood door without sagging. Took off one star only because the mounting screws provided were a bit short for our specific floor thickness.

Anonymous

Mar 20, 2026

Rating: 5/5

Smooth operation

We replaced an old broken spring with this N-818 model. The difference is night and day. The buffer function prevents the door from slamming, which was a major concern for us.

Anonymous

Mar 17, 2026

Rating: 5/5

Perfect for heavy office doors

Installed this on our main entrance glass door which weighs about 140kg. It handles the weight effortlessly and the closing action is smooth and quiet. Highly recommended for commercial use.

Anonymous

Mar 09, 2026

Rating: 5/5

Professional grade hardware

As a contractor, I have installed many floor springs. This authentic N-818 is top-tier. The finish is durable, and the mechanism is precise. Will definitely order more for future projects.

Anonymous

Mar 01, 2026

Rating: 5/5

Great value for money

Compared to other brands, this ZKHG model offers excellent performance at a better price point. It has been running for three months without any issues in a high-traffic area.

5 FAQ

Q: Can I adjust the closing speed myself after installation?

A: Absolutely. There are adjustment valves on the unit that allow you to customize both the main closing speed and the latching speed using a standard screwdriver.

Q: What is the minimum door weight required for this spring to work effectively?

A: While rated for up to 160kg, it performs optimally on doors weighing between 80kg and 160kg. For lighter doors, a smaller model might be more appropriate.

Q: Is this suitable for a double glass door setup?

A: Yes, the N-818 can be used for double doors, but you will need to purchase two units, one for each door leaf, to ensure balanced operation.

Q: Does this come with a template for cutting the floor hole?

A: Yes, the package includes a paper installation template to help you mark the exact dimensions needed for embedding the spring into the floor.

Q: Is the chrome finish resistant to corrosion in humid environments?

A: The chrome plating provides good resistance to rust and corrosion, making it suitable for most indoor environments. However, for coastal areas with high salt exposure, regular maintenance is advised.

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