SS304 GB819 M4 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.

Stainless steel 304 GB819 M4 Cross Recessed CSK Head Machine Screws , conforming to the GB819 national standard, are precision-engineered fasteners designed for robust performance in industrial and commercial applications. Fabricated from SS304 (AISI 304) austenitic stainless steel, they combine exceptional corrosion resistance with high mechanical strength, making them ideal for environments exposed to moisture, mild chemicals, or aggressive atmospheric conditions. The M4 metric thread profile (with a standard pitch of 0.7mm) ensures compatibility with global manufacturing standards, while the cross recessed CSK (countersunk) head offers a sleek, low-profile design optimized for flush mounting in thin materials.

The CSK head geometry features an 82° conical bearing surface that distributes clamping forces evenly, reducing stress concentrations and minimizing material deformation—a critical advantage in applications involving sensitive substrates like sheet metal, plastics, or composite panels. The cross recess accommodates both manual and automated assembly using Phillips screwdrivers (Type 2 drive system), balancing ease of use with reduced cam-out risk during torque application. This design is particularly beneficial in electronics enclosures, HVAC systems, and machinery components where aesthetic cleanliness and structural integrity are paramount.

Available in standardized lengths from 4mm to 30mm , these screws integrate seamlessly with tapped holes or mating nuts per ISO 4032/4033 specifications, offering flexibility in joint design. Whether securing control panels, appliance housings, or medical device assemblies, these M4 cross recessed CSK head machine screws deliver a cost-effective, long-term solution that balances regulatory compliance, durability, and functional versatility. Their widespread adoption across industries underscores their role as a cornerstone fastening component in modern engineering.