S-91770A078 2-56 x 1/2" ASME B18.6.3 Stainless Steel Truss Head Phillips Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance from passivated 18-8 stainless steel, ideal for humid or chemically aggressive environments
• Exceptional tensile strength of 70,000 psi ensures reliable, long-lasting fastening under high-stress conditions
• Wide truss head design provides enhanced load distribution and prevents surface damage
• Coarse UNC threading with Class 2A fit offers quick installation and secure hold in various materials
• Full threading along the 1/2" length allows for maximum adjustability and grip depth
• Phillips No. 1 drive enables efficient driving with common tools, reducing assembly time
• Compliance with ASME, RoHS 3, and REACH guarantees industry-standard quality and environmental safety

Professional Applications & Engineering Value

Engineered for demanding industrial settings, these 2-56 UNC rounded truss head screws in passivated 18-8 stainless steel address critical challenges like vibration loosening and material fatigue. The wide truss head distributes clamping force effectively, minimizing the risk of damage to softer substrates, while the coarse thread ensures rapid, secure fastening in plastics, sheet metal, and electronic enclosures. With a Rockwell B70 hardness and 70,000 psi tensile strength, they provide dependable performance in machinery, automotive assemblies, and outdoor equipment where corrosion resistance and durability are paramount. The fully threaded design and Phillips drive streamline maintenance and repairs, reducing downtime in production lines.

Specification Summary & Compliance

This screw meets ASME B18.6.3 specifications, with UNC coarse threads in a Class 2A fit for consistent dimensional accuracy. It is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring no restricted substances are used. The right-hand thread and 1/2" length provide standardized compatibility across industrial applications.