S-91802A077 2-56 x 1/4" ASME B18.6.3 Stainless Steel Phillips Oval Head 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 mechanical strength with 80,000 psi tensile strength and Rockwell B80 hardness for demanding applications
• Precise Class 2A thread fit providing consistent engagement and reduced risk of cross-threading during assembly
• Optimized Phillips No. 1 drive design for secure tool engagement and reduced cam-out during installation
• Fully threaded coarse spacing enabling faster installation and superior holding power in various materials
• Standard oval head profile with 82° countersink angle for flush mounting and clean aesthetic finish
• Full regulatory compliance meeting ASME B18.6.3 specifications while being RoHS 3 and REACH compliant

Professional Applications & Engineering Value

These 2-56 UNC flat head Phillips screws deliver critical performance advantages in precision assembly applications where corrosion resistance and mechanical reliability are paramount. The passivated 18-8 stainless steel construction provides exceptional protection against oxidation and chemical exposure, making these fasteners ideal for electronics enclosures, medical devices, marine equipment, and industrial machinery exposed to moisture or corrosive agents. The combination of coarse thread spacing and fully threaded design ensures rapid installation and maximum thread engagement in both metallic and non-metallic substrates. The oval head profile with standardized countersink angle facilitates flush mounting while the Phillips No. 1 drive offers familiar, efficient installation with standard tools, reducing assembly time and improving production efficiency.

Specification Summary & Compliance

Manufactured to exacting ASME B18.6.3 standards with Class 2A thread fit tolerances ensuring precise dimensional accuracy and interchangeability. The 2-56 UNC coarse thread specification provides optimal performance in most materials while the 1/4" length offers versatile application coverage. Full compliance with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations ensures environmental responsibility and workplace safety. The passivated surface treatment enhances corrosion resistance without compromising the material's inherent 80,000 psi tensile strength and Rockwell B80 hardness characteristics.