Stainless Steel Screws Flat Head

Stainless steel screws flat head is specially designed for applications that require a flat surface without bulges after installation. Its head has a ninety-degree cone angle and can sink below the surface of the workpiece after perfectly matching with the countersunk hole to ensure that the assembly area is smooth and obstacle-free. It is suitable for panel installation, fluid pipe flanges and decorative structures where appearance and air flow resistance are required. Taking the M6 ​​specification as an example, the diameter of the head was actually measured to be 12.6 mm, and the thickness of the countersunk head was precisely measured to 3.7 mm. The dimensional deviation from the ISO 10642 standard was controlled within plus or minus 0.1 mm, ensuring consistency with the standard countersunk hole cone surface. The torque test verified that after applying an installation torque of 15 Nm, the contact indentation between the head and the countersunk hole cone surface was even and continuous, and there was no unilateral depression caused by eccentric load. The material is made of high-quality austenitic stainless steel. After passivation treatment, its surface can withstand one thousand hours without red rust in the neutral salt spray test, providing reliable anti-corrosion protection for outdoor humid environments.

The thread of this screw is formed by precision rolling process, and the thread pitch diameter tolerance strictly follows the 6g level of ISO 965-1 standard. Together with the solid lubricating film coated on the surface, the screwing torque is stable and consistent. In repeated assembly tests, after twenty complete screw-in and screw-out cycles, there was no significant wear or bite marks on the thread surface, and the standard deviation of the maximum screw-in torque each time did not exceed 5%, which provides a reliable basis for torque control for batch assembly operations. The head drive groove adopts a cross groove or plum blossom groove design, which can withstand a driving torque of more than 18 Nm with standard screwdrivers without slot slippage. After three thousand high-frequency vibration tests, the preload force retention rate still reaches 92% of the initial value, effectively preventing the equipment from loosening during long-term operation. It is especially suitable for occasions such as electrical cabinets and ship bulkheads that have dual stringent requirements for fastening reliability and surface flatness.

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