SS304 GB819 M8 Cross Recessed CSK Head Machine Screws

Made from stainless steel 304, these screws are resistant to air, water, acids, and alkali salts. Their Phillips head design allows for easy installation and removal with standard screwdrivers.Commonly used in machinery, electronics, appliances, and construction, SS304 screws offer strength and durability. Their countersunk heads sit flush with the material surface, providing a clean and finished look. Suitable for both metal and plastic applications, these screws are ideal for a wide range of projects, from home repairs to industrial manufacturing.

The Stainless steel 304 GB819 M8 Cross Recessed CSK Head Machine Screws are high-performance fasteners engineered for heavy-duty industrial applications, combining exceptional durability with corrosion-resistant properties. Fabricated from stainless steel 304 (AISI 304) , these screws exhibit superior resistance to environmental stressors such as moisture, mild chemicals, and chloride exposure, making them suitable for marine, automotive, and outdoor equipment. Compliant with the GB819 national standard , they feature an M8 metric thread profile (with a pitch of 1.25mm) and a cross recessed countersunk (CSK) head , designed to deliver optimal torque transmission while maintaining a streamlined aesthetic. The 82° conical bearing surface of the CSK head ensures even force distribution across thin materials, minimizing deformation risks in substrates like sheet metal, plastics, or composite panels—ideal for machinery assemblies, structural components, and electronics enclosures requiring both strength and visual refinement.

These screws incorporate a Type 2 Phillips drive system within the cross recess, enabling reliable engagement during manual or automated assembly while reducing cam-out risk under high-torque conditions. Their non-magnetic characteristics in annealed conditions enhance compatibility with electromagnetic-sensitive systems, while optional surface treatments—such as electropolishing or passivation—can be applied to further optimize corrosion resistance without compromising dimensional precision. Manufactured via advanced cold-heading and thread-rolling processes, they achieve a minimum tensile strength of 500 MPa and yield strength of 200 MPa (per ASTM F593 standards), ensuring reliability under dynamic loads.

Compliant with GB819 , the SS304 GB819 M8 Cross Recessed CSK Head Machine Screws undergo rigorous testing for proof load, hardness (150–200 HV), and salt spray resistance, guaranteeing consistent performance across production batches. Available in standardized lengths from 8mm to 60mm , they integrate seamlessly with tapped holes or mating nuts per ISO 4032/4033 specifications, offering flexibility in joint design. Their temperature tolerance spans from cryogenic environments to elevated operating temperatures exceeding 800°C in oxidizing atmospheres, broadening their utility in aerospace, renewable energy systems, and heavy machinery.