S-91099A457 2-56 x 3/8" 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
- Superior corrosion resistance with passivated 18-8 stainless steel construction, ensuring long-term reliability in harsh industrial environments.
- High tensile strength of 80,000 psi provides exceptional load-bearing capacity for demanding mechanical assemblies.
- Flush mounting design featuring an undercut flat head and 82° countersink angle for seamless, vibration-resistant installations.
- Precise Class 2A thread fit with UNC coarse threading ensures easy assembly and reliable fastening in high-vibration applications.
- Durable Rockwell B80 hardness maintains thread integrity and resists wear during repeated use.
- Full threading along the 3/8" length offers maximum grip and uniform stress distribution.
- Compliance with ASME B18.6.3, RoHS 3, and REACH guarantees adherence to industry standards and environmental regulations.
Professional Applications & Engineering Value
Engineered for precision and durability, these 2-56 UNC flat head screws address common industrial challenges such as corrosion, vibration loosening, and assembly efficiency. The passivated 18-8 stainless steel material provides excellent resistance to oxidation and chemical exposure, making them ideal for electronics, machinery, and automotive applications. The undercut flat head profile and 82° countersink angle ensure a flush finish, reducing protrusion risks and improving aerodynamic or aesthetic surfaces. With a Phillips drive and coarse thread spacing, these screws enable quick installation and secure fastening in materials where fine threads may strip, enhancing productivity in high-volume manufacturing and maintenance operations.
Specification Summary & Compliance
This screw meets Class 2A thread fit tolerances per UNC standards, ensuring precise engagement and consistent performance. Manufacturing adheres to ASME B18.6.3 specifications for dimensional accuracy and mechanical properties. The product is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, confirming the absence of hazardous substances and supporting sustainable procurement practices.
