S-91770A872 5/16"-18 x 2 3/4" 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, ideal for harsh industrial environments
• Enhanced load distribution from the wide rounded truss head design, reducing surface damage and improving clamping force
• High tensile strength of 70,000 psi ensures reliable performance under heavy mechanical stress
• Excellent thread engagement with UNC coarse threading and Class 2A fit for quick installation and vibration resistance
• Optimized drive efficiency using No. 4 Phillips drive for secure torque application and reduced cam-out risk
• Partial threading design allows for precise clamping control in assembly applications
• Full regulatory compliance with ASME B18.6.3, RoHS 3, and REACH standards for guaranteed quality and safety

Professional Applications & Engineering Value

This rounded truss head Phillips screw delivers exceptional engineering value in demanding industrial settings where corrosion resistance and structural integrity are paramount. The passivated 18-8 stainless steel construction provides lasting protection against rust and chemical exposure, making it ideal for outdoor equipment, marine applications, and food processing machinery. The unique truss head design offers a wider bearing surface than standard round heads, distributing clamp load more effectively to prevent material distortion in sheet metal, plastics, and composite assemblies. With its UNC coarse threads and partial threading, this fastener ensures rapid installation and precise joint control in high-vibration environments. The combination of 70,000 psi tensile strength and Rockwell B70 hardness provides reliable performance in structural applications where mechanical stress and fatigue resistance are critical requirements.

Specification Summary & Compliance

This screw features precision 5/16"-18 UNC coarse threads with Class 2A thread fit for consistent engagement and proper clearance. Manufacturing complies with ASME B18.6.3 specifications ensuring dimensional accuracy and performance reliability. The product is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations, confirming its suitability for global industrial applications with strict material restrictions.