S-91770A869 1/4"-20 x 5" 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, ensuring long-term reliability in harsh environments
• Exceptional load-bearing capacity thanks to 70,000 psi tensile strength and Rockwell B70 hardness for demanding applications
• Enhanced stability and reduced surface pressure from the wide truss head design with 0.573" diameter
• Quick and secure installation facilitated by UNC coarse threading and No. 3 Phillips drive
• Precise thread engagement with Class 2A fit for consistent performance and reduced cross-threading risks
• Optimized for partial threading applications providing flexibility where full threading isn't required
• Full regulatory compliance meeting ASME B18.6.3, RoHS 3, and REACH standards for global industrial use

Professional Applications & Engineering Value

These rounded truss head Phillips screws deliver critical engineering advantages for industrial applications where vibration resistance, corrosion protection, and structural integrity are paramount. The passivated 18-8 stainless steel construction provides exceptional resistance to oxidation and chemical exposure, making them ideal for outdoor equipment, marine environments, and chemical processing facilities. The wide truss head design distributes clamping force over a larger surface area (0.573" diameter), preventing material distortion in softer substrates while the UNC coarse threading ensures rapid installation and superior holding power in wood, plastic, and metal assemblies. With partial threading and 5" length, these fasteners offer precise control in applications requiring specific unthreaded shank sections, while the No. 3 Phillips drive provides reliable torque transmission without cam-out issues common in industrial settings.

Specification Summary & Compliance

Manufactured to exacting ASME B18.6.3 standards with Class 2A thread fit tolerance for consistent engagement and reliability. The UNC 1/4"-20 coarse thread specification ensures compatibility with standard industrial components, while the partial threading with minimum 1½" thread length provides design flexibility. Full compliance with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations guarantees environmental safety and unrestricted use in global markets. The combination of 70,000 psi tensile strength and Rockwell B70 hardness ensures these screws meet the rigorous demands of heavy-duty fastening applications.