S-91770A585 5/16"-18 x 1 1/4" ASME B18.6.3 Stainless Steel Truss Head Phillips Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance with passivated 18-8 stainless steel construction for extended service life in harsh environments
• Enhanced load distribution through wide truss head design that reduces surface pressure and prevents pull-through
• Reliable torque transmission with No. 4 Phillips drive that minimizes cam-out during installation
• Optimized thread engagement with UNC coarse threads and Class 2A fit for faster assembly and vibration resistance
• High mechanical strength delivering 70,000 psi tensile strength and Rockwell B70 hardness for demanding applications
• Full threading capability providing consistent fastening along the entire 1-1/4" length for maximum holding power
• Regulatory compliance assurance meeting ASME B18.6.3 standards and environmental regulations for global deployment

Professional Applications & Engineering Value

These passivated 18-8 stainless steel truss head screws address critical industrial challenges where corrosion resistance and reliable fastening are paramount. The wide truss head design significantly increases bearing surface area, making them ideal for sheet metal assemblies, electrical enclosures, and automotive components where material distortion must be prevented. The combination of UNC coarse threads and Class 2A fit ensures rapid installation in production environments while maintaining vibration resistance in dynamic applications. The No. 4 Phillips drive provides efficient torque transfer without specialized tools, streamlining maintenance and assembly processes across manufacturing facilities, marine equipment, and outdoor infrastructure projects where environmental exposure demands corrosion-resistant fasteners with proven durability.

Specification Summary & Compliance

This industrial fastener maintains precise Class 2A thread fit with UNC coarse threading (5/16"-18) and full threading along the 1-1/4" length. Manufactured to ASME B18.6.3 specifications with dimensional accuracy including 0.698" head diameter and 0.183" head height. Fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations, ensuring safe use across global markets while delivering consistent mechanical performance with 70,000 psi tensile strength and Rockwell B70 hardness ratings.