Self Closing Piano Hinge
Self Closing Piano Hinge suppliers

Self Closing Piano Hinge

Name: China Self Closing Piano Hinge Manufacturers Suppliers Factory - Joyear Metalwork
Brand: JOYEAR
SKU: 300606422

Minimum Order Quantity ： 500 pcs
Weight Range ： 0.5g–500kg
Dimensional tolerance ： ±0.2 mm
Please provide product specifications so that we can offer specific pricing and MOQ.

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Product Introduction

Self closing piano hinge is a long hinge that achieves automatic reset function through a built-in spring structure. It is often used for door covers or boxes that need to be tightly closed. Its typical dimensional tolerance can be controlled within ±0.2 mm, which complies with precision stamping process standards and ensures a stable fit between the blade and the pin. At the same time, the longest continuous length of this type of hinge can reach 2,400 mm, which meets the integrated installation requirements of large cabinets or access doors and avoids alignment errors caused by multi-segment splicing. It is this combination of long size and high precision that makes self-closing piano hinges widely used in the fields of industrial equipment and architectural decoration.

For indoor and outdoor general models, the product surface is generally treated with environmentally friendly galvanizing. The thickness of the coating is usually not less than 8 microns. According to the GB/T 9799 standard, it can effectively delay the oxidation of the base material. In order to verify the corrosion resistance, the manufacturer will conduct a neutral salt spray test according to ASTM B117. High-quality coating can ensure that no red rust appears for more than 72 hours. This means that even in humid or mild salt spray environments, the hinge still maintains stable closing torque and mechanical strength, greatly reducing the risk of self-closing failure due to corrosion.

About Us

Joyear Metalwork specializes in producing various types of piano hinges. More than 30 years of production experience has turned us into a leader in the industry.

Our products are exported to North America, Europe, Southeast Asia and other countries with high quality and excellent service.

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SPECIFICATION

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Why choose us

★ Length can be customized

High-quality self-closing piano hinges are available in continuous lengths up to 2400mm. The long-dimension integrated design eliminates gaps and misalignments caused by multi-section splicing, and controls the door gap uniformity within ±0.3 mm. Large equipment access doors, exhibition cabinets or bank counters can thus achieve better sealing and appearance consistency, avoiding early failure caused by local stress concentration.

★ Blade thickness affects load carrying capacity

Common high-quality product blades are 1.2 mm thick and can withstand a static load of 120 pounds per inch of length. The ASTM E73 loading test method shows that the permanent deformation does not exceed 0.2 mm when the load is uniformly distributed along the hinge axis. Thicker blades are more resistant to bending deformation and are suitable for heavy steel doors or industrial cabinets that are frequently opened and closed. If the thickness is reduced to 1.0 mm, the load-bearing capacity will decrease by about 30%, making it unsuitable for high-load scenarios.

★ Torque increases slightly as temperature decreases

In a ‑20°C environment, the 90° return torque of the self-closing hinge is approximately 10% higher than the room temperature value. The elastic modulus of spring steel increases as the temperature decreases. Although increased torque is beneficial to closing, excessive torque may cause the door body to hit the door frame and produce noise. On the contrary, the torque will drop by about 8% at 80°C, but it is still within the design range. Therefore, general-grade products should be avoided in high-temperature environments, as their grease may be lost and the torque will decay faster.

★ The maximum static load has a standard value

The 2-inch-wide, 1.2-mm-thick stainless steel hinge can safely support a uniform load of 135 pounds per inch of length. Designers can calculate the required number of hinges based on door weight and total hinge length. For example, a door weighing 60 pounds and 36 inches high uses two 24-inch hinges to carry about 1.25 pounds per inch, which is well below the limit and very reliable. But never apply a single point concentrated load to the middle of the hinge.