We bought two sets. The first works fine. But the second lid won’t stay up. Did we do something wrong or is there something wrong with the hinges?

You need to make sure that sorings are in place, they should keep the lid in open position, providing they were installed firmly.

Will these support a 30lb door?

I cannot say for sure about a 30lb door, but I think that would be pushing it. My biggest regret with these hinges is that they do not open a full 90 degrees. I did not understand that this would allow them to close quickly with the slightest touch. I used them on an Ikea footstool, and the lid is very heavy. It lifts fine and stays most of the time, but with just a touch it will slam shut. If I were doing it over again, I would opt for at least 90 degrees open and perhaps a soft close for safety. Amazon has some of these for just $2 more.

What is the weight load per hinge?

I used these hinges to build a custom toolbox. For space-saving reasons, I removed the springs which snap-and-hold the hinges at their open/closed positions. The layer of tools I’ve got attached to the hinges is about 10 lbs. When the hinges are flipped up to 80°, even without the springs, those 10 lbs of tools are held up quite nicely until I tip it back down. I’m sure they could take more weight, so long as that weight is supported properly in it’s closed position.

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2 Pieces 80 Degree Foldable Lifting Bracket, Black Spring Hinges are widely Used in Sofa Hinge Lifters, Furniture Storage Support Hinges

2 Pieces 80 Degree Foldable Lifting Bracket, Black Spring Hinges are widely Used in Sofa Hinge Lifters, Furniture Storage Support Hinges

Product ID: 238810675

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Details

Material
Stainless
Brand
KAFENDA
Product Dimensions
5.9"L x 1.71"W
Finish Type
Nickel
Mounting Type
Door Mount
Hole Count
6

🔩80° precise fold angle

⚙️50,000+ open-close cycles durability

🛠️Stainless steel heavy-duty build

Description

⚙️ Elevate your furniture game with precision and power!

VERSATILE FIT - Perfect for sofas, folding beds, cabinets, and more—upgrade your space instantly
DUAL SPRING POWER - High-tension springs ensure reliable, effortless opening every time
SEAMLESS 80 FOLD - Optimized lift angle for smooth sofa and cabinet operation
SLEEK INVISIBLE DESIGN - Nickel-plated finish blends discreetly with modern furniture aesthetics
INDUSTRIAL GRADE STRENGTH - Crafted from corrosion-resistant stainless steel for lasting durability

This 2-piece set of 80-degree foldable lifting brackets features heavy-duty stainless steel construction with a nickel-plated finish for corrosion resistance and sleek looks. Designed for sofas, folding beds, and cabinet doors, the high-strength springs provide smooth, reliable lift support with over 50,000 cycles of durability. Each pack includes left and right hinges, making it a versatile upgrade for modern furniture and storage solutions.

Specifications

Material	Stainless Steel
Brand	KAFENDA
Product Dimensions	5.9"L x 1.71"W
Finish Type	Nickel
Mounting Type	Door Mount
Hole Count	6
Unit Count	2.0 Count
Global Trade Identification Number	00077063785014
Manufacturer	KAFENDA
UPC	077063785014
Part Number	KA1
Item Weight	13.2 ounces
Item model number	KA
Color	Black
Style	Heavy Duty
Finish	Nickel
Item Package Quantity	1
Number Of Pieces	2
Included Components	hinge
Batteries Included?	No
Batteries Required?	No