S-98164A531 5/16"-24 x 1 1/4" 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 chemical and marine environments
- Superior thread engagement and vibration resistance with Class 3A thread fit and UNF fine threading for precise assemblies
- Enhanced durability and load capacity with 70,000 psi tensile strength and Rockwell B55 hardness
- Optimized corrosion protection through passivated surface treatment for extended service life
- Secure installation and removal using standard 3/16" hex drive for reliable torque transmission
- Full-length thread coverage ensures consistent fastening strength across the entire 1 1/4" length
- Industry-standard compliance meeting ASME B18.3 specifications for dimensional accuracy and performance
Professional Applications & Engineering Value
These 316 stainless steel rounded head screws deliver critical performance advantages in demanding industrial applications where corrosion resistance and mechanical reliability are paramount. The combination of UNF fine threading with Class 3A thread fit provides superior vibration resistance in machinery, automotive, and marine equipment, preventing loosening under dynamic loads. The passivated finish significantly enhances the natural corrosion resistance of 316 stainless steel, making these button head screws ideal for chemical processing, offshore platforms, and food processing facilities where exposure to corrosive agents is common. The fully threaded design ensures maximum grip length and uniform stress distribution, while the hex drive configuration allows for high-torque installation in confined spaces.
Specification Summary & Compliance
Manufactured to precise Class 3A thread fit tolerances with 5/16"-24 UNF fine threading and compliant with ASME B18.3 dimensional standards. These screws meet RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental compliance requirements, ensuring they contain no restricted substances. The mechanical properties include 70,000 psi tensile strength and Rockwell B55 hardness, providing reliable performance in industrial fastening applications.
