S-91770A075 2-56 x 3/8" 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 environments
• Enhanced load distribution from the wide truss head design, reducing surface damage and improving clamping force
• High mechanical strength with 70,000 psi tensile strength and Rockwell B70 hardness for reliable performance under stress
• Quick installation with Phillips No. 1 drive and coarse UNC threads, minimizing assembly time
• Consistent thread engagement due to Class 2A fit and fully threaded design, ensuring secure fastening
• Broad compatibility with standard UNC 2-56 components, simplifying inventory and replacement
• Environmental compliance meeting RoHS 3 and REACH standards, safe for regulated industries

Professional Applications & Engineering Value

These 2-56 UNC rounded truss head screws deliver exceptional engineering value in applications requiring reliable fastening under corrosive or high-vibration conditions. The passivated 18-8 stainless steel provides excellent resistance to oxidation and chemical exposure, extending service life in electronics, automotive, and industrial equipment assemblies. The wide truss head design distributes clamping force over a larger surface area, preventing material deformation and maintaining seal integrity in plastic or thin-metal components. With coarse threading and fully threaded construction, these screws offer rapid installation and consistent holding power, reducing the risk of loosening in dynamic environments. The Phillips No. 1 drive ensures compatibility with standard tools, streamlining maintenance and production workflows while meeting rigorous ASME B18.6.3 specifications for dimensional accuracy.

Specification Summary & Compliance

This fastener maintains precise Class 2A thread fit per UNC standards with a 2-56 thread size and right-hand threading. Manufacturing adheres to ASME B18.6.3 specifications, ensuring consistent dimensional accuracy across head diameter (0.194"), length (3/8"), and drive compatibility. The screw is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, guaranteeing safe use in environmentally sensitive applications without hazardous substances.