S-91772A648 5/16"-18 x 5" ASME B18.6.3 Stainless Steel Pan Head Phillips Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance with passivated 18-8 stainless steel construction for long-lasting performance in harsh environments
• Optimized load distribution through the rounded pan head design that minimizes surface damage during installation
• Enhanced driving efficiency with Phillips No. 4 drive that provides secure tool engagement and reduces cam-out risk
• Reliable thread engagement with Class 2A thread fit ensuring consistent fastening in coarse UNC threading applications
• Exceptional mechanical strength delivering 70,000 psi tensile strength and Rockwell B70 hardness for heavy-duty applications
• Strategic partial threading allowing unthreaded shank sections to function as precision dowels in alignment-critical assemblies
• Full regulatory compliance meeting ASME B18.6.3 specifications while being RoHS 3 and REACH compliant for global use

Professional Applications & Engineering Value

This 5/16"-18 UNC partially threaded rounded head screw delivers exceptional engineering value through its specialized design and material properties. The passivated 18-8 stainless steel provides superior corrosion resistance ideal for industrial environments where moisture, chemicals, or outdoor exposure are concerns. The partially threaded configuration serves dual purposes: the threaded section ensures secure fastening while the smooth shank acts as a precision alignment feature, preventing shear forces and maintaining component positioning in machinery, structural frameworks, and heavy equipment assemblies. The coarse UNC threading enables rapid installation and superior holding power in various materials, while the Phillips No. 4 drive offers efficient torque transfer without specialized tools. This combination makes it particularly valuable for applications requiring both precise component alignment and robust fastening integrity.

Specification Summary & Compliance

This high-performance fastener features precision Class 2A thread fit tolerances with 5/16"-18 UNC coarse threading and partial threading configuration. Manufacturing strictly adheres to ASME B18.6.3 specifications ensuring dimensional accuracy and performance reliability. The screw maintains full compliance with RoHS 3 (2015/863/EU) restrictions on hazardous substances and REACH (EC 1907/2006) regulations for chemical safety, making it suitable for global industrial applications and environmentally conscious manufacturing operations.