S-91355A188 5/16"-18 x 7/8" 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
- Superior corrosion resistance with Black-Oxide coating, extending service life in demanding industrial environments.
- High-reliability fastening from 120,000 psi tensile strength and Rockwell C32 hardness, preventing shear and deformation under heavy loads.
- Precise, vibration-resistant thread engagement due to Class 3A fit and UNC coarse thread spacing, minimizing loosening in machinery.
- Efficient installation and removal with a 3/16" Hex drive, providing secure tool grip and reducing assembly time.
- Enhanced load distribution and stability from the integrated flange and wide button head design, reducing surface damage.
- Full-threaded design ensures maximum grip length and holding power along the entire 7/8" shank.
- Global compliance and safety with RoHS 3 and REACH regulations, ensuring suitability for international industrial supply chains.
Professional Applications & Engineering Value
Engineered for high-stress applications, this Black-Oxide Alloy Steel Rounded Head Screw addresses critical challenges in assembly and maintenance. Its Class 3A thread fit and UNC coarse spacing provide exceptional resistance to vibrational loosening in machinery, automotive, and heavy equipment. The flanged button head design distributes clamping force evenly, protecting sensitive surfaces from indentation. Combined with a 3/16" Hex drive, it enables quick, high-torque installation in confined spaces. The fully threaded 7/8" length ensures consistent engagement in thick materials, while the Black-Oxide finish offers reliable protection against rust and wear in humid or corrosive environments, making it a dependable choice for OEMs and MRO operations.
Specification Summary & Compliance
This screw adheres to UNC thread standards with a Class 3A fit for precise dimensional accuracy and superior thread engagement. Manufacturing complies with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring environmental safety and material restrictions are met. The product features a coarse thread spacing, right-hand threading, and is fully threaded for maximum performance in industrial applications.
