S-92949A438 1/4"-20 x 3 1/4" ASME B18.3, ASTM F879 Stainless Steel Button Head Hex-Drive Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance with 18-8 stainless steel construction and passivated finish, ideal for harsh industrial environments
• Exceptional mechanical strength with 70,000 PSI tensile strength for reliable performance in demanding applications
• Secure and efficient installation through hex drive design that prevents cam-out and enables high torque application
• Precise thread engagement with Class 3A thread fit ensuring tight tolerances and vibration resistance
• Full UNC coarse threading provides faster assembly and superior holding power in various materials
• Rounded head design offers improved aesthetics and reduced risk of snagging in finished applications
• Regulatory compliance assurance meeting ASME B18.3, RoHS 3, and REACH standards for global industrial use

Professional Applications & Engineering Value

This 18-8 stainless steel rounded head screw delivers exceptional engineering value across multiple industrial sectors. The combination of 70,000 PSI tensile strength and passivated finish provides reliable performance in corrosive environments where fastener integrity is critical. The hex drive design ensures secure installation without stripping, while the UNC coarse threading facilitates rapid assembly in production environments. These heavy-duty fasteners are particularly valuable in machinery assembly, electrical enclosures, and structural applications where vibration resistance and long-term reliability are paramount. The rounded head profile enhances safety and aesthetics in consumer-facing equipment while maintaining the mechanical advantages of industrial-grade screws.

Specification Summary & Compliance

This 1/4"-20 x 3 1/4" screw features precise Class 3A thread fit with UNC coarse thread spacing and full threading along the entire shank. Manufactured to ASME B18.3 specifications (ASTM F879) with dimensional accuracy including 0.437" head diameter and 0.132" head height. The fastener is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring environmental responsibility and global market acceptance for industrial applications.