Metal Door Frame Hinge Screws

Metal door frame hinge screws adopt an asymmetric tooth shape and a slight taper guide structure in the thread geometry design, which significantly reduces the friction resistance when the screws are screwed into prefabricated holes or self-tapping into the metal door frame. The measured screwing torque is about 28% lower than that of conventional machine wire screws, effectively avoiding the phenomenon of cold welding seizure during the installation process. At the same time, this special tooth shape can generate radial expansion force after being fully locked. It has been verified by pull-out tests that on a 2.5 mm thick steel door frame, the pull-out resistance of a single screw reaches 5,600 Newtons. The data comes from standard tensile testing machine tests to ensure that the screws will not loosen along the axial direction when the door leaf is subject to lateral impact or frequent opening and closing. This design is particularly suitable for thin-walled metal door frames because it reduces stress damage to the frame during tapping and provides a reliable locking effect.

 

 

The screw head adopts a hexagonal star-shaped groove drive structure, combined with the tapered surface under the head and fine knurling, to ensure that the installation tool can efficiently transmit torque without slipping. In the standard torque wrench test, the anti-torsion slippage limit of the drive groove reached 28 Nm, which is nearly twice that of the traditional cross groove, which greatly enhances the installation reliability. After five hundred repeated disassembly and assembly cycles of the dry film lubricating coating covering the surface, its friction coefficient remains stable in the range of 0.09 to 0.11. This data is based on friction and wear testing machine testing, ensuring stable reproduction of torque during maintenance and replacement. At the same time, the coating has self-healing properties and can fill in fine scratches during the screwing process to prevent the substrate from being exposed to corrosive media. This allows the screws to maintain excellent rust-proof performance even in environments where indoor and outdoor temperature differences change, and provides a long-term and reliable fixing solution for door frame hinge connections.

 

 

 

 

 

 

 

Obtain drawings from customers or create drawings based on their specifications or samples.

The drawings, product raw materials, surface treatment, and other details are attested to by both parties.

 

 

 

 

 

Provide a quote, confirm the order quantity, and include all relevant information.

Like the terms of payment, the terms of trade, the kind of packaging, etc.

 

 

 

When manufacturing the goods, adhere precisely to the original drawings and samples.

After a final inspection, it was meticulously packaged and delivered to the customers.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

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