S-91099A458 2-56 x 1/2" ASME B18.6.3 Stainless Steel Phillips Flat Head Screws
Stainless Steel Phillips Flat Head Screws
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Basic Information
Head Parameters
Dimensions
Thread Parameters
Tip & Drive Parameters
Material & Strength
Temperature & Environment
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Key Features & Benefits at a Glance
- Exceptional corrosion resistance with passivated 18-8 stainless steel construction, ideal for harsh industrial environments
- Superior holding power achieved through 80,000 psi tensile strength and Rockwell B80 hardness for reliable fastening
- Optimized flush mounting with undercut flat head design and 82° countersink angle for seamless surface integration
- Enhanced driving efficiency featuring Phillips No. 1 drive for secure tool engagement and reduced cam-out risk
- Consistent thread performance with UNC coarse threading and Class 2A fit ensuring smooth installation and vibration resistance
- Full-thread engagement along the entire 1/2" length provides maximum grip strength in various material thicknesses
- Regulatory compliance meeting ASME B18.6.3 specifications and environmental standards including RoHS 3 and REACH
Professional Applications & Engineering Value
These 2-56 UNC flat head screws deliver critical engineering solutions where corrosion resistance and flush surface requirements are paramount. The passivated 18-8 stainless steel construction prevents oxidation in moisture-prone applications, while the undercut flat head profile ensures proper seating without protrusion in precision assemblies. The coarse UNC threading provides excellent grip in softer materials and plastics, reducing stripping risks. With full threading along the entire shank, these screws maintain consistent clamping force across varying material thicknesses in electronics, machinery, and automotive components. The Phillips No. 1 drive offers reliable torque transmission for production line efficiency, making them ideal for high-volume manufacturing environments requiring repeated disassembly and reassembly.
Specification Summary & Compliance
Manufactured to ASME B18.6.3 standards with Class 2A thread fit tolerances ensuring precise dimensional accuracy. Features UNC coarse threads with right-hand direction and 82° countersink angle. Fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations for industrial applications worldwide.
