SS304 GB819 M3 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 M3 cross recessed csk head machine screws, manufactured to the stringent requirements of the GB819 national standard, represent a precision-engineered fastening solution designed for versatility and reliability in industrial and commercial applications. Featuring an M3 metric thread profile with a pitch of 0.5mm, these screws adhere to standardized dimensional tolerances while maintaining compatibility with ISO 261 and ISO 724 specifications for thread geometry, ensuring seamless integration with mating components across global supply chains. The cross recessed countersunk (CSK) head design, characterized by its 82° conical bearing surface, enables flush mounting in pre-countersunk holes while distributing clamping forces evenly to prevent damage to sensitive materials—a critical feature for applications in electronics, HVAC systems, and sheet metal assemblies where aesthetic finish and structural integrity are equally prioritized.

Constructed from SS304 (AISI 304) austenitic stainless steel, these fasteners combine excellent corrosion resistance with robust mechanical properties, including a minimum tensile strength of 500 MPa and yield strength of 200 MPa (per ASTM F593 standards), making them suitable for environments exposed to moisture, mild acids, or chlorides commonly found in coastal or industrial settings. The alloy’s non-magnetic characteristics in annealed conditions further enhance their utility in electromagnetic-sensitive equipment, while its formability allows for consistent thread-rolling and head-forming during cold-heading manufacturing processes. Surface treatments such as passivation or electropolishing may be applied to optimize oxide layer formation, further extending service life in aggressive atmospheres without compromising dimensional accuracy.

Engineered for precision assembly, the Phillips drive system (Type 2) integrated into the cross recessed head balances ease of tool engagement with reduced risk of cam-out compared to slotted counterparts, particularly when using automated screwdrivers in high-volume production lines. The countersunk head’s undercut design accommodates material thickness variations while maintaining a low-profile finish, ideal for applications requiring unobtrusive fastening in control panels, appliance housings, or architectural hardware. Compliance with GB819 ensures adherence to rigorous mechanical testing protocols, including proof load verification, hardness assessments (typically 150–200 HV), and salt spray resistance evaluations, guaranteeing performance consistency across batches.