Long Self Tapping Screws For Metal

Long self tapping screws for metal is made of high-quality alloy steel that has undergone multi-stage quenching and tempering heat treatment. The surface hardness reaches 450 to 500 HV according to the Vickers hardness test. The core tensile strength is not less than 1,200 MPa. It meets the requirements of ISO 898-1 for high-strength fasteners, ensuring that the threads will not chip and the rod will not twist and break when penetrating thick metal substrates. Taking the specifications of a total length of 80 mm and a diameter of 6 mm as an example, a simultaneous drilling and tapping test was conducted on a Q235 steel plate with a thickness of 6 mm. The maximum penetration torque peak was only 20 Nm, and the thread engagement rate after tapping reached more than 95% through cross-section testing. , and there was no obvious chip clogging or heat seizure during the installation process, indicating that the geometric angle of the drilling section and chip groove design of the screw can effectively match the metal cutting conditions, and is suitable for the combined connection of multi-layer steel plates or the rapid assembly of coated metal components.

 

 

The surface is treated with zinc-aluminum composite coating and supplemented by sealant. According to the neutral salt spray accelerated corrosion test standard, no red rust spots appear on the base body or thread bottom after 800 hours of continuous spraying. The anti-corrosion performance is more than twice that of conventional galvanized layers, meeting the long-term fastening needs of outdoor communication equipment or coastal steel structures. In a lateral load test simulating wind-induced vibration, after being loaded for 80,000 cycles at a frequency of 25 Hz and an amplitude of 2.5 mm, the residual preload force remained at 92% of the initial value, proving that its thread profile has excellent anti-relaxation properties and is particularly suitable for metal connection scenarios that are subject to long-term dynamic loads, such as photovoltaic brackets or traffic noise barriers.

 

 

The tail of the screw is equipped with a self-centering guide cone, and combined with the double-edged drill tip structure, stable drilling can be achieved on a 4.5 mm thick stainless steel plate without the need for frequent tool retraction and chip removal. This shortens the installation time of a single screw by about 60% compared with the traditional drilling first and then tapping process, significantly improving the efficiency of batch installation.

 

 

 

 

 

 

 

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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