S-91355A189 5/16"-18 x 1 1/2" Steel Flanged Button Head Hex-Drive Screws
Steel Flanged 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 with black-oxide coating that protects against rust in demanding industrial environments
- Superior torque transmission through the 3/16" hex drive that prevents stripping and ensures secure fastening
- Maximum load-bearing capacity with 120,000 psi tensile strength and Rockwell C32 hardness for heavy-duty applications
- Enhanced stability and distribution from the wide button head design and 0.688" flange diameter that reduces surface pressure
- Precise thread engagement with Class 3A thread fit ensuring reliable performance in critical assemblies
- Full-threaded design providing consistent holding power along the entire 1-1/2" length
- Compliance with environmental standards including RoHS 3 and REACH for global manufacturing applications
Professional Applications & Engineering Value
Engineered for demanding industrial applications, these black-oxide alloy steel screws deliver exceptional performance where corrosion resistance and high strength are paramount. The 5/16"-18 UNC coarse threading with Class 3A thread fit ensures precise engagement in metal assemblies, while the wide button head design with integrated flange provides superior load distribution without requiring separate washers. The 3/16" hex drive enables high-torque installation in confined spaces, making these fully threaded screws ideal for machinery, automotive components, and heavy equipment where vibration resistance and long-term reliability are critical. The combination of 120,000 psi tensile strength and environmental compliance makes them suitable for global supply chain requirements.
Specification Summary & Compliance
This rounded head screw features precise Class 3A thread fit per UNC standards with coarse thread spacing and right-hand threading. Manufacturing complies with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations, ensuring suitability for international industrial applications. The fully threaded design maintains consistent 0.313" thread diameter throughout the 1-1/2" length, while the flanged design with 0.688" diameter provides enhanced bearing surface.
