S-91770A562 1/4"-20 x 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
• Exceptional load-bearing capacity with 70,000 psi tensile strength and Rockwell B70 hardness for demanding applications
• Enhanced stability and clamping force from the wide truss head design that distributes pressure over larger surface areas
• Reliable thread engagement with UNC coarse threads and Class 2A fit ensuring consistent fastening performance
• Optimized installation efficiency through Phillips No. 3 drive compatibility with standard industrial tools
• Versatile partial threading allowing precise tension control where full thread engagement isn't required
• Full regulatory compliance meeting ASME B18.6.3 specifications and environmental standards including RoHS 3 and REACH

Professional Applications & Engineering Value

These passivated 18-8 stainless steel rounded truss head screws deliver critical engineering advantages for industrial applications where corrosion resistance and structural integrity are paramount. The combination of 70,000 psi tensile strength and Rockwell B70 hardness ensures reliable performance in heavy-duty assemblies, while the wide truss head profile provides superior load distribution that prevents surface damage and maintains joint integrity. The 1/4"-20 UNC coarse threads with Class 2A fit offer excellent engagement in various materials, making them ideal for machinery, electrical enclosures, and structural frameworks where vibration resistance and long-term durability are essential. The partial threading design allows for precise clamping force control in applications requiring specific unthreaded shank sections.

Specification Summary & Compliance

Manufactured to exacting ASME B18.6.3 standards with precision Class 2A thread fit and UNC coarse thread specifications. These 4-inch partially threaded screws feature consistent dimensional accuracy throughout. Fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations, ensuring safe use across industrial sectors while maintaining the corrosion-resistant properties of passivated 18-8 stainless steel construction.