S-98164A512 2-56 x 5/8" ASME B18.3, ASTM F879 Stainless Steel Button Head Hex-Drive Screws
Stainless Steel Button Head Hex-Drive 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 from 316 stainless steel construction, ideal for harsh environments and chemical exposure
- High tensile strength of 70,000 psi ensures reliable fastening under significant mechanical stress and vibration
- Superior thread engagement with Class 3A fit and UNC coarse spacing for faster assembly and reduced cross-threading risk
- Enhanced durability with Rockwell B55 hardness providing excellent wear resistance and long service life
- Optimized drive performance from the 0.050" hex drive, allowing secure tool engagement and high torque application
- Long-term corrosion protection through passivated finish, maintaining appearance and integrity in demanding conditions
- Full threading along the 5/8" length offers maximum grip and adjustment flexibility in various material thicknesses
Professional Applications & Engineering Value
Engineered for demanding industrial applications, these 316 stainless steel rounded head screws deliver exceptional performance in corrosive environments where standard fasteners fail. The combination of 70,000 psi tensile strength and Rockwell B55 hardness ensures reliable operation in high-vibration machinery, electrical enclosures, and marine equipment. The UNC coarse thread spacing with Class 3A fit provides rapid installation in soft materials and plastics while minimizing stripping. The passivated finish enhances the natural corrosion resistance of 316 stainless steel, making these button head screws ideal for chemical processing, food equipment, and outdoor applications where moisture and chemicals are present. The 0.050" hex drive design ensures secure tool engagement for precise torque control in confined spaces.
Specification Summary & Compliance
These screws feature precision 2-56 UNC threads with Class 3A thread fit for superior dimensional accuracy and consistent performance. Manufacturing complies with ASME B18.3 specifications (ASTM F879) ensuring reliable quality and interchangeability. The products are fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, meeting the latest environmental and safety standards for industrial use.
