Attributes

Brand	-
Category	Basic Building Materials / Floor Springs
Origin	-
Brand	GMT
Model Series	H-220B+ / N-818
Door Weight Capacity	Up to 140 kg (308 lbs)
Material	Cast Iron with Steel Components
Finish	Silver Chrome Plated
Mounting Type	Concealed Floor Mount
Adjustable Closing Speed	Yes, Dual Valve Control
Backcheck Function	Included for Wind Protection
Suitable Door Width	Up to 1100 mm
Warranty Period	2 Years Manufacturer Warranty

6 reviews

Anonymous

Mar 27, 2026

Rating: 5/5

Heavy duty and reliable

Installed this on a heavy glass entrance door for our office. The build quality is exceptional, and the hydraulic action is very smooth. It handles the weight effortlessly.

Anonymous

Mar 26, 2026

Rating: 5/5

Perfect replacement part

Needed an authentic GMT unit to replace an old failing one. This model fit exactly into the existing cavity. No more slamming doors!

Anonymous

Mar 19, 2026

Rating: 5/5

Smooth operation in high traffic

We use this in a retail store with hundreds of people passing through daily. After six months, it still operates as smoothly as day one. Highly recommended.

Anonymous

Mar 16, 2026

Rating: 4/5

Solid construction

Very robust unit. The chrome finish looks professional. Only giving 4 stars because the instruction manual could be more detailed regarding the valve adjustments.

Anonymous

Mar 15, 2026

Rating: 5/5

Excellent value for money

Compared to other brands in this category, the GMT offers superior durability at a fair price. The backcheck feature prevents the door from hitting the wall during windy days.

Anonymous

Mar 08, 2026

Rating: 4/5

Great product, installation requires care

The floor spring works perfectly once installed. Make sure you have the right tools and follow the template precisely. The adjustable speed valves are a nice touch.

5 FAQ

Q: What is the maximum door weight this model can support?

A: This specific model supports doors weighing up to 140 kg (approximately 308 lbs). For heavier doors, please consult our industrial series.

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

A: Absolutely. There are two adjustment valves on the unit that allow you to fine-tune the closing speed and latching action using a standard screwdriver.

Q: Does this come with the mounting box and template?

A: Yes, the package includes the floor spring unit, a galvanized steel mounting box, an installation template, and all necessary fixing screws.

Q: Is this floor spring suitable for double acting doors?

A: Yes, the GMT H-220B+ series is designed specifically for double acting doors, allowing them to swing open in both directions and close automatically.

Q: Is this compatible with glass doors without frames?

A: Yes, provided you use the appropriate glass door patches or clamps. The floor spring itself mounts into the floor, while the top pivot connects to the door patch.

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