Piano Hinge With Slotted Holes

Piano Hinge With Slotted Holes show extremely high fault tolerance at the installation site. The slotted holes extend along the length of the blade, allowing the bolts to slide in the groove before tightening to compensate for manufacturing deviations or thermal expansion and contraction deformation between the door frame and door leaf. According to the ISO 2768 fine-level tolerance standard, the slot width tolerance of oblong holes is controlled within plus or minus 0.1 mm, and the slot length is usually twice the diameter of the bolt. For example, the M6 ​​specification hole slot can provide a continuous adjustment range of plus or minus five millimeters. This data comes from the manufacturer's compliance inspection of batch products to ensure that any deviation in the left or right or up and down directions can be effectively absorbed. Actual assembly statistics show that the use of this type of hinge can shorten the door leaf centering adjustment time from fifteen minutes with the traditional round hole structure to eight minutes, and increase the efficiency by nearly half. After adjustment, the parallelism deviation of the door seam can be controlled within 0.3 millimeters, which is especially suitable for mass-produced equipment casings and modular cabinets.

 

 

In terms of long-term load-bearing and weather resistance, piano hinges with oblong holes are made of stainless steel 304 and electrochemically passivated to ensure that the edges of the hole slots are burr-free and corrosion-resistant. According to the ASTM B117 accelerated salt spray test, the hinge showed no red rust or corrosion pits after being exposed to five percent sodium chloride spray for 900 hours, while ordinary galvanized hinges can only last 400 hours under the same conditions. At the same time, according to ASME B18.21.1 Recommended guidelines for fastener installation. When an oblong hole is matched with a locknut with a nylon insert, it is recommended that the tightening torque be set to 80% of the conventional value to allow the bolt to be fine-tuned in the slot without excessive frictional resistance. Actual measurements show that the torque is At 6 Nm, the axial clamping force of M6 bolts can reach more than 5,000 N, and the edge of the hole slot has no obvious indentation or deformation after being subjected to frequent disassembly and assembly. This makes this type of hinge particularly suitable for occasions such as outdoor communication base stations and solar brackets that require both convenience of adjustment and weather resistance reliability.

 

 

 

 

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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.

 

 

 

 

 

 

 

 

 

 

 

 

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