Custom Flat Piano Hinge

JOYEAR produces made-to-order custom flat piano hinges for industrial apparatus, metallic housings, storage cupboards, and machine fascia panels. We tailor span, plate breadth, sheet gauge, pin size, and fixing-hole layouts to suit each buyer's requirements, enabling accurate mating and simplified installation. Stainless, carbon, and aluminium grades are all available.

Backed by an in-house plant and robust OEM/contract-manufacturing capability, JOYEAR can build from CAD files, PDF technical documents, or tangible specimens. Purchasers gain prototype turnaround of 7–14 days, mass-production cycles of roughly four weeks, and tailored export packing. From initial trial builds through recurring volume purchases, we serve international clients as a reliable production ally.

 

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.

 

 

 

 

Flat piano hinges are continuous hinges designed to distribute the connection along the length of two adjoining panels or components. Their extended leaf structure provides a continuous mounting arrangement rather than relying on several separate hinge points.

For OEM projects, the overall hinge configuration can be adjusted to match the installation space, panel dimensions, and assembly requirements. JOYEAR supports customized specifications rather than limiting customers to a single standard dimension.

The hinge profile affects how two panels connect, how much clearance is required, and how the hinge fits into the surrounding structure.

For industrial OEM applications, selecting the correct profile is important because even a small dimensional difference can affect installation and panel alignment.

JOYEAR can evaluate customer drawings and discuss suitable flat hinge configurations based on the actual application.

► For projects requiring a particular open-flat or close-flat profile, customers can provide a cross-sectional drawing or reference sample for evaluation.

★ Stage Overhead Access Door

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Theatrical stages have lighting and machinery above the ceiling. Maintenance workers access these areas through an overhead door. The door hinge must support the worker's weight. A high-quality stainless steel flat piano hinge has a static load capacity of at least 350 kg per meter. For example, a hinge that is 38 mm wide and 1 meter long can safely support four adults standing together. Four adults weigh about 280 kg. This provides a critical safety margin for high-altitude work.

★ Embedded Electric Oven Door

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An oven door hinge must resist high temperatures without bending. A 304 stainless steel flat piano hinge can work at 250°C for 1,000 hours. Its opening and closing torque changes by only 5% after this test. The hinge still moves smoothly. In contrast, a galvanized carbon steel hinge shows surface oxidation peeling after 200 hours at the same temperature. After 300 hours, the carbon steel hinge sticks and fails to operate properly.

★ Vending Machine Access Door

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The access door of a vending machine is pushed and pulled hundreds of times every day. It may also suffer from violent impacts. A high-quality flat piano hinge is tested with a 10 Joule pendulum impact. This is equivalent to a 0.5 kg steel ball dropped from a height of 2 meters. After the impact, the hinge leaf shows no plastic deformation. The pin does not come out. This performance ensures the hinge works without damage for at least three years in public areas.

★ Degaussing Ship Cabin Door

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Degaussing ships and submarines have very sensitive magnetic fields. Any magnetic part can interfere with navigation equipment. A 304 stainless steel flat piano hinge is specially annealed to reduce magnetism. Its relative magnetic permeability (μr) is less than or equal to 1.05 in actual measurements. A standard carbon steel hinge has a μr greater than 100. The low magnetism of the stainless steel hinge allows the ship's magnetometer to work correctly. The hinge also has a thickness of 1.5 mm. This thickness provides good sound insulation for the cabin door.

Make tooling according to the confirmed drawing, do the modification if needed while testing.

Make first samples, send them to the customer for approval.

Strictly produce the goods as per the drawings and first samples.

Packed well after final inspection and ship to customers.

Get drawings from customers, or design drawings according to customers' details requests or sample.

Both parties confirm the drawings.

Quote and confirm order quantity, specify all the details including trade terms, payment terms, type of package, etc.

Flat piano hinge is a metal hinge that is continuously distributed along the entire length and has a very distinctive appearance. The thickness accuracy of a single blade can reach ±0.1 mm, ensuring that the entire hinge surface is smooth and uneventful. At the same time, the surface of the blade has been treated with 240 mesh drawing, and the texture is uniform and the roughness Ra value is not greater than 0.8 microns, showing a delicate matte metal texture.

Another appearance feature is that the flatness of the entire hinge does not exceed 0.3 mm per meter, that is, the warpage of a 2-meter-long hinge is less than 0.6 mm, and the gap between the door leaf and the frame is even after installation. In addition, the edge of the blade is chamfered to 0.5 mm, eliminating sharp burrs and making it visually rounded and smooth. The countersunk angle of the opening is precisely controlled at 90 degrees, and the screws can be completely flush with the surface after installation.

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