8-32 Carbon Steel Black Oxide Cup Head Screw

 

#8-32 carbon steel black oxide cup head screws are designed for mechanical assemblies that require high strength, corrosion resistance, and aesthetic appearance. The unique blackening process provides excellent rust protection while maintaining a low-key, professional black appearance.

They commonly use steel materials like 1018, 1035, and 10B21, and the tensile strength grade can reach 8.8-10.9. After special treatments such as blackening, its rust resistance can be enhanced to meet the requirements of long-term use. After quenching and tempering, the tensile strength can reach 500MPa and the hardness can reach HRB 70-85 (Rockwell hardness). Using SCM435 material, the strength grade can be as high as 12.9, which is suitable for thick-walled parts and high-load scenarios, such as automobiles and mechanical parts.

1. Features
① The head of the cup head screw is cup-shaped, which can be installed in deeper holes and provide a larger support area to better disperse the additional load.
② The thread of the cup head screw is tapered, which can better drill into the material and achieve a higher tightening force.
③The appearance of the cup head screw is beautiful and suitable for the assembly of some mechanical equipment that requires beauty.

2. Application
#8-32 carbon steel black oxide cup head screws are widely used for fastening and assembly in various fields such as electrical engineering, electrical appliances, mechanical equipment, automobiles, motorcycles, bicycles, aerospace, etc., such as the fixing of electrical sockets, the fixing of bird nest racks and cutting and melting machines, and the fixing and assembly of parts such as automobiles and bicycles.

Why choose our products?
1. We can provide material report (SGS/MSDS) to ensure the components meet the standards.
2. Full process salt spray test + torque test to eliminate thread slippage or rust defects.
3. Supports non-standard dimensions, surface polishing, laser engraving, and other requirements.