S-91770A568 1/4"-20 x 5/16" 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
• Exceptional holding power from 70,000 psi tensile strength and full threading for maximum load distribution
• Enhanced stability and reduced surface pressure with wide truss head design preventing pull-through in softer materials
• Reliable fastening performance with Class 2A thread fit ensuring consistent engagement and vibration resistance
• Easy installation and removal with No. 3 Phillips drive for efficient assembly in high-volume applications
• Long-term durability with Rockwell B70 hardness maintaining structural integrity under repeated stress
• Regulatory compliance assurance meeting ASME B18.6.3 standards and environmental regulations for global supply chain compatibility

Professional Applications & Engineering Value

These 1/4-20 UNC rounded truss head screws deliver critical engineering solutions where corrosion resistance and structural reliability are paramount. The passivated 18-8 stainless steel construction provides exceptional protection against chemical exposure and atmospheric corrosion, making them ideal for marine equipment, food processing machinery, and outdoor structural assemblies. The combination of coarse UNC threading and fully threaded design ensures rapid installation and superior pull-out resistance in wood, plastic, and sheet metal applications. The wide truss head profile distributes clamping force over a larger surface area, preventing material deformation while the Phillips drive enables efficient torque transfer during high-speed assembly operations. These characteristics make them particularly valuable in electrical enclosures, automotive components, and industrial machinery where vibration resistance and long-term performance are critical.

Specification Summary & Compliance

Manufactured to precise dimensional standards with Class 2A thread fit tolerance for consistent mating with corresponding nuts and threaded holes. Complies with ASME B18.6.3 specifications for dimensional accuracy and mechanical properties. Meets RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental compliance requirements, ensuring restriction-free use in global markets. Thread specifications include 1/4"-20 UNC coarse threading with right-hand direction and full threading along the 5/16" length for maximum engagement strength.