Steel Cutting Screws

When installing plates of different thicknesses or hardnesses, the head shape selection of Steel Cutting Screws directly affects the tightening effect and tool matching. Its countersunk head design is suitable for situations where the surface needs to be kept flat, while the pan head or hexagonal flange head can provide a larger bearing surface to prevent soft materials from being dented. According to ISO 7049's dimensional regulations for cross-recessed countersunk head self-tapping screws, the groove depth deviation is controlled within plus or minus 0.05 mm, ensuring that the transmission efficiency reaches more than 95% when matched with the PH2 bit, effectively reducing slippage or bit pop-out. The cutting edge of this screw usually has a rake angle of 30 degrees. According to the measured cutting torque data, this angle can reduce the torque required for tapping on the aluminum alloy plate by about 25% compared with the zero-degree rake angle design, which significantly reduces operating fatigue and equipment load. It is particularly practical in the assembly of air-conditioning casings and communication chassis. The precision of the threads formed by self-cutting can reach 6H level, with tight fit and good anti-loosening performance.

For difficult-to-machine materials such as high-strength steel or pre-hardened plastics, steel cutting screws can be added with an extrusion taper at the rear of the cutting groove, which is cut first and then extruded to make the thread form fuller and reduce burrs. According to DIN 7500 Part 1, the breaking torque of self-tapping screws is specified. For cutting screws with ST3.0 specifications, the breaking torque is not less than 1.8 Nm. When actually screwing into a quenched and tempered steel plate, the screwing torque is stable below 1 Nm. The ratio between the two is about 0.56, and the safety margin is sufficient. At the same time, according to ISO 16047 test method for torque-clamping force. When the screw is tightened to 2.0 Nm, the clamping force generated can reach 2,400 N. The ratio of clamping force to screwing torque is approximately 1,200 N per Nm. This efficient conversion feature benefits from the low friction coefficient of zinc. Aluminum coating, the friction coefficient of the coating drops from 0.15 to 0.09 after lubrication, which effectively prevents overheating and annealing of the cutting edge during high-speed assembly. Therefore, it is widely used in situations such as car seat frames and lithium battery module fixation that have high requirements for connection reliability and assembly speed.

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.

Hot Tags: steel cutting screws, China steel cutting screws manufacturers, suppliers, factory