PWM black pan head Phillips machine screw with washer, computer case round head screw M2/M2.5M3/M3.5/M4

The core advantages of the black round head padded screws are "material protection and anti-loosening, convenient installation, rust-proof and aesthetically pleasing appearance, and wide adaptability.

1. With an integrated design featuring a built-in washer, the screw combines the dual effects of material protection and anti-loosening. The screw head is integrally formed below or comes with a matching fixed washer, eliminating the need for additional flat washers or spring washers. It can be directly used during installation, saving assembly time. The washer increases the contact area between the screw and the workpiece, effectively distributing the tightening pressure and preventing the screw from embedding into soft/thin-walled substrates such as wood, plastic, and thin metal, thus preventing substrate cracking and deformation. At the same time, the elasticity or anti-slip properties of the washer enhance the screw's anti-vibration and anti-loosening capabilities, making it less prone to loosening due to minor vibrations during home appliance operation and furniture use.
2. The round and smooth structure ensures safety and scratch resistance, while its concealed and aesthetically pleasing design adds to its appeal. The head is a semi-spherical shape with edges that have undergone smooth chamfering, eliminating any sharp edges. Daily contact will not scratch skin, clothing, or delicate internal components of equipment (such as home appliance wiring or components inside computer cases). The black surface (often treated with blackening or electrophoresis blackening) blends well with dark furniture, equipment casings, and other assembly surfaces, providing a visually harmonious appearance when exposed. Compared to bright-colored screws, it appears more tidy and understated.
3. Black surface treatment, basic rust prevention + a black protective layer on the wear-resistant and durable surface (black oxidation, electrophoresis, or galvanized blackening) can isolate air and moisture. It exhibits good rust prevention performance in indoor dry and mildly humid environments, preventing fastening failure or contamination of workpieces caused by rusting of screws. The protective layer also enhances the surface hardness, making it less prone to wear on the head slot (cross/inner hexagon) during repeated disassembly and assembly, reducing the risk of slipping

Shenzhen Huayuanxing Precision Hardware Co., Ltd. is a manufacturer specializing in the development, production, and sales of screw fasteners, with 20 years of industry experience. Huayuanxing screws are characterized by precision, miniaturization, and firmness. The company's existing factory covers an area of over 8,000 square meters, with a finished product warehouse of over 4,000 square meters and a stock inventory of over 3,000 tons. It has successively introduced more than 250 precision production equipment, including cold heading machines, thread rolling machines, and thread milling machines, capable of producing small screws with an outer diameter of 1mm and a length of 3mm, with an average daily production capacity of up to 20 million pieces. Huayuanxing has complete inspection equipment, including salt spray testing machines and 2D imaging detectors. It currently employs more than 50 people, including 8 engineering and technical personnel with 20 years of industry experience