S-91099A107 2-56 x 5/16" 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 for long service life in harsh environments.
- High tensile strength of 80,000 psi ensures reliable fastening under significant mechanical stress.
- Precise Class 2A thread fit provides smooth assembly and consistent clamping force in industrial applications.
- Undercut flat head design allows for a flush, low-profile installation that minimizes protrusion.
- 82° countersink angle ensures a secure, flush fit in standard countersunk holes.
- Phillips drive (No. 1) offers common tool compatibility for efficient installation and removal.
- Full compliance with ASME B18.6.3, RoHS 3, and REACH guarantees material safety and meets rigorous industrial standards.
Professional Applications & Engineering Value
These 2-56 UNC flat head screws are engineered to address critical fastening challenges in demanding environments. The passivated 18-8 stainless steel provides superior corrosion resistance, making them ideal for applications exposed to moisture, chemicals, or outdoor elements, such as in electronics enclosures, machinery panels, and automotive assemblies. The coarse UNC thread spacing and Class 2A thread fit ensure quick, reliable installation with reduced risk of cross-threading, while the undercut flat head and 82° countersink angle deliver a clean, flush finish that prevents snagging and improves aesthetic integration. With a high tensile strength of 80,000 psi and Rockwell B80 hardness, these screws maintain integrity under vibration and load, offering long-term reliability for industrial fastening solutions.
Specification Summary & Compliance
This screw features a 2-56 UNC coarse thread with Class 2A thread fit for standard dimensional accuracy and ease of assembly. It is manufactured in compliance with ASME B18.6.3 specifications, ensuring consistent quality and performance. The product is fully RoHS 3 (2015/863/EU) Compliant and REACH (EC 1907/2006) Compliant, confirming adherence to environmental and safety regulations for hazardous substances.
