4 Inch Bidirectional Soft Close Frog Hinge | UsionTop Cabinet Hinge

On April 30, 2026, UsionTop officially launched its new Bidirectional Hidden Soft Close Hinge for the global furniture hardware market. This 4-inch hydraulic frog hinge targets the pain points of loud slamming, misalignment and wear of traditional cabinet doors, with an upgraded dual-hydraulic buffer structure to achieve smooth bidirectional closing, delivering a better hardware solution for kitchen, wardrobe and other furniture scenarios.

This hinge adopts a dual-hydraulic damping collaborative design, with upper and lower dampers controlling the closing speed of the front and rear sections of the door opening respectively, achieving impact-free closing from open to close. The tested opening and closing noise is as low as 28dB, even when you take ingredients from the kitchen at midnight, it will not disturb your sleeping family, completely solving the loud slamming noise of traditional cabinet doors.

Different from traditional exposed hinges, this concealed hinge is completely embedded between the door panel and the cabinet body after installation, with no exposed parts when the door is closed. It perfectly fits modern minimalist and light luxury style custom furniture, making the overall vision of wardrobes and cabinets more neat and unified, enhancing the home texture.

With standard 4-inch size, this hinge can bear up to 25kg per piece, and a pair of hinges can support a 50kg solid wood door panel, which is 15% higher than the old model. It also fits door panels with thickness from 16mm to 28mm, and can be widely used in kitchen cabinets, bedroom wardrobes, bathroom cabinets and other furniture scenarios, with stronger universality.

Customer FAQs

Q: Can this frog hinge fit thick door panels?

A: Yes, this 4-inch hinge fits door panels with thickness from 16mm to 28mm. It works perfectly for both regular particleboard doors and heavy solid wood doors, and there will be no door sagging problem after installation.

Q: Can the bidirectional hinge open both inward and outward?

A: Exactly, this bidirectional hinge supports both inward and outward opening and soft closing of the cabinet door, which is very suitable for some special cabinet scenarios that require two-way door opening, making it more flexible to use.

Q: Can I adjust the gap after installing the concealed hinge?

A: Yes, this hinge has 3-way adjustment function. After installation, you can adjust the door gap up/down, left/right, front/back without removing the door, easily handling installation errors and slight deformation of the door body.

Q: Can this soft close hinge be used for outdoor cabinets?

A: The hinge adopts nickel-plated anti-rust treatment, with basic waterproof and anti-rust ability, it can be used for semi-outdoor balcony cabinets. But it is not recommended to expose it to extreme environments such as heavy rain and exposure for a long time.