S-92949A533 1/4"-20 x 5/16" ASME B18.3 Stainless Steel Button Head Hex-Drive Screws

Key Features & Benefits at a Glance

• Exceptional corrosion resistance with 18-8 stainless steel construction and passivated finish for long-lasting performance in harsh environments
• Superior thread engagement with Class 3A thread fit ensuring precise, secure fastening in demanding applications
• High mechanical strength with 70,000 psi tensile strength and Rockwell B55 hardness for reliable load-bearing capability
• Efficient installation through 5/32" hex drive design providing excellent torque transmission and reduced tool slippage
• Optimized thread design with UNC coarse threads enabling faster assembly and reduced cross-threading risks
• Full threading coverage along the 5/16" length for maximum grip and uniform stress distribution
• Regulatory compliance assurance meeting ASME B18.3 standards and environmental regulations including RoHS 3 and REACH

Professional Applications & Engineering Value

These 18-8 stainless steel rounded head screws deliver critical performance advantages for industrial assembly applications where corrosion resistance and mechanical reliability are paramount. The combination of Class 3A thread fit and UNC coarse threading ensures rapid installation with minimal risk of cross-threading, significantly reducing assembly time in high-volume production environments. The passivated finish provides an additional protective layer against chemical exposure and oxidation, making these hex drive screws ideal for machinery, electrical enclosures, and outdoor equipment where environmental factors would compromise ordinary fasteners. With full threading across the entire 5/16" length, these screws maintain consistent clamping force and vibration resistance throughout the fastened joint.

Specification Summary & Compliance

This fastener maintains precision Class 3A thread fit per UNC standards with 1/4"-20 coarse thread configuration. Manufacturing complies with ASME B18.3 specifications ensuring dimensional accuracy and performance reliability. Environmental compliance includes RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) requirements, confirming the absence of restricted substances. The mechanical properties meet specified 70,000 psi tensile strength and Rockwell B55 hardness values for consistent performance across industrial applications.