S-90471A120 2-56 x 5/16" ASME B18.6.3 Steel Phillips Flat Head Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance with zinc-plated steel construction, ensuring long-term durability in demanding industrial environments
• High tensile strength of 60,000 psi provides reliable fastening under significant mechanical stress and vibration
• Rockwell B70 hardness maintains thread integrity and prevents stripping during installation and use
• Standard flat head profile with 100° countersink angle allows for flush mounting and clean aesthetic finishes
• Class 2A thread fit with UNC coarse threading ensures easy alignment and rapid assembly in various materials
• Phillips No. 1 drive design offers secure tool engagement and reduced cam-out during installation
• Full threading with right-hand direction maximizes grip length and provides consistent clamping force

Professional Applications & Engineering Value

These 2-56 UNC flat head screws deliver exceptional engineering value for industrial applications where space constraints and surface finish requirements are critical. The zinc-plated steel construction provides essential corrosion protection for machinery, electronic enclosures, and automotive components exposed to harsh environments. The standard flat head profile with 100° countersink angle enables flush mounting in precision assemblies, eliminating protrusions that could interfere with moving parts or aesthetic requirements. The combination of coarse UNC threading and Class 2A thread fit ensures reliable performance in both metal and plastic substrates, reducing installation time while maintaining vibration resistance. These Phillips drive screws are particularly valuable in applications requiring repeated disassembly and reassembly, as the Rockwell B70 hardness prevents thread deformation over multiple cycles.

Specification Summary & Compliance

These screws feature precision Class 2A thread fit with UNC coarse thread spacing (2-56 thread size) and are manufactured to ASME B18.6.3 specifications for dimensional accuracy and performance. The product meets RoHS 3 (2015/863/EU) compliance for restricted substances and REACH (EC 1907/2006) regulations, ensuring environmental responsibility and workplace safety. With a tensile strength rating of 60,000 psi and full threading configuration, these fasteners are engineered for reliable performance in industrial and commercial applications.