S-91771A145 6-32 x 5/16" ASME B18.6.3 Stainless Steel Phillips Flat Head Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance with passivated 18-8 stainless steel construction, ideal for harsh industrial environments
• Exceptional tensile strength of 80,000 psi ensures reliable fastening under high-stress conditions
• Precise Class 2A thread fit provides smooth installation and consistent engagement in UNC coarse threaded applications
• 82° countersink angle and flat head design delivers a flush, professional finish while preventing snagging
• Rockwell B80 hardness offers excellent durability and resistance to wear during repeated use
• Full threading along the 5/16" length allows for maximum grip and adjustability in various material thicknesses
• Phillips No. 2 drive enables efficient installation with common tools, reducing assembly time

Professional Applications & Engineering Value

These 6-32 UNC flat head screws are engineered to address common industrial challenges such as vibration loosening and corrosion-induced failure. The passivated 18-8 stainless steel material provides a protective oxide layer that significantly enhances resistance to moisture, chemicals, and oxidation, making these Phillips drive screws ideal for electronics enclosures, machinery panels, and outdoor equipment. The coarse UNC thread and Class 2A fit ensure quick, secure fastening in softer materials like aluminum or plastics, while the flat head profile with 82° countersink allows for seamless integration into pre-drilled holes, eliminating protrusions that could interfere with moving parts or aesthetic requirements. This combination of material properties and precise engineering delivers long-term reliability in demanding applications, reducing maintenance needs and downtime.

Specification Summary & Compliance

This screw adheres to ASME B18.6.3 dimensional standards, ensuring consistent quality and interchangeability. The UNC coarse thread features a Class 2A tolerance for reliable fit, while the fully threaded 5/16" length and 82° countersink angle meet specified industrial requirements. Compliance with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations confirms the absence of hazardous substances, making these screws suitable for global supply chains and environmentally conscious manufacturing processes.