S-98164A266 5/16"-18 x 1/2" 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
- Superior corrosion resistance from 316 stainless steel construction, ideal for harsh chemical and marine environments
- Enhanced thread reliability with Class 3A precision fit, ensuring secure fastening and vibration resistance
- Optimized drive engagement through 3/16" hex drive design, preventing cam-out during high-torque installation
- Extended service life thanks to passivated surface treatment that enhances corrosion protection
- High mechanical strength with 70,000 psi tensile strength and Rockwell B55 hardness for demanding applications
- Full threading coverage along the 1/2" length provides maximum grip and load distribution
- Regulatory compliance assurance meeting ASME B18.3, ASTM F879, RoHS 3, and REACH standards
Professional Applications & Engineering Value
These 316 stainless steel rounded head screws deliver exceptional performance in corrosive environments where standard fasteners fail. The passivated finish creates a protective oxide layer that significantly enhances resistance to chemicals, saltwater, and industrial atmospheres. With Class 3A thread fit and UNC coarse threading, these hex drive screws maintain precise tolerances while allowing for rapid installation in production environments. The combination of 70,000 psi tensile strength and Rockwell B55 hardness ensures reliable performance in structural applications, chemical processing equipment, marine hardware, and food processing machinery where both strength and corrosion resistance are critical engineering requirements.
Specification Summary & Compliance
This 5/16"-18 UNC fully threaded screw features precision Class 3A thread fit with coarse thread spacing for optimal engagement. Manufactured to ASME B18.3 specifications and ASTM F879 standards, these fasteners ensure dimensional accuracy and performance reliability. The product is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, meeting current environmental and safety requirements for industrial applications worldwide.
