SS304 GB819 M5 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 SS304 GB819 M5 Cross Recessed CSK Head Machine Screws represent a precision-engineered fastening solution tailored for demanding industrial applications, blending robust mechanical performance with corrosion-resistant properties. Manufactured in accordance with the GB819 national standard, these screws feature an M5 metric thread profile (with a pitch of 0.8mm) and a cross recessed countersunk (CSK) head , designed to provide optimal torque transmission while maintaining a low-profile aesthetic finish. Fabricated from stainless steel 304 (AISI 304) , they exhibit superior resistance to environmental degradation, including resistance to moisture, mild acids, and chloride exposure, making them suitable for use in marine, chemical processing, and outdoor equipment.

The CSK head design incorporates an 82° conical bearing surface that ensures even force distribution across thin materials, reducing the risk of deformation in substrates like sheet metal, plastics, or composite panels. The cross recess accommodates both manual and automated assembly using Phillips screwdrivers (Type 2 drive system), offering reliable engagement without excessive cam-out during high-torque applications. This combination of functionality and form factor makes the Stainless steel 304 GB819 M5 Cross Recessed CSK Head Machine Screws ideal for electronics enclosures, machinery components, and architectural hardware where structural integrity and visual cleanliness are critical.

Engineered through advanced cold-heading and thread-rolling processes, these screws achieve a minimum tensile strength of 500 MPa and yield strength of 200 MPa (per ASTM F593 standards), ensuring durability under dynamic loads. Their non-magnetic characteristics in annealed conditions further enhance compatibility with electromagnetic-sensitive systems, while optional surface treatments—such as electropolishing or passivation—can be applied to optimize corrosion resistance without compromising dimensional accuracy.

Available in standardized lengths ranging from 5mm to 40mm , these screws integrate seamlessly with tapped holes or mating nuts per ISO 4032/4033 specifications, providing flexibility in joint design. Their temperature tolerance spans from cryogenic environments to elevated operating conditions exceeding 800°C in oxidizing atmospheres, broadening their utility in aerospace, automotive, and renewable energy systems.