S-95599A137 1/4"-20 x 1/2" Stainless Steel Oversized-Flange Button Head Hex-Drive Screws
Stainless Steel Oversized-Flange 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 18-8 stainless steel construction, ideal for harsh environments and long-term reliability.
- Excellent tensile strength rated at 80,000 psi and Rockwell B85 hardness for dependable load-bearing and resistance to deformation.
- Enhanced fastening efficiency with a 5/32" hex drive and flanged design, eliminating the need for a separate washer and providing a larger bearing surface.
- Reliable thread engagement through fully threaded UNC coarse threads and Class 2A fit, ensuring consistent performance and easier alignment in various materials.
- Streamlined, low-profile installation with a rounded button head style, reducing snagging and providing a finished appearance.
- Broad industrial compliance by meeting RoHS 3 and REACH regulations, ensuring safety and environmental standards are met for global applications.
Professional Applications & Engineering Value
This 18-8 stainless steel flanged button head screw is engineered to address common industrial challenges such as vibration loosening, corrosion, and assembly speed. The integrated flange distributes clamping force over a wider area, reducing surface pressure and preventing damage to softer materials. The UNC coarse threads and Class 2A fit provide excellent pull-out resistance in metals, plastics, and wood, making it a versatile choice for machinery, automotive assemblies, and electronic enclosures. Its fully threaded design and hex drive enable quick, secure installations with standard tools, streamlining production lines and maintenance workflows while the rounded head profile enhances safety and aesthetics in visible applications.
Specification Summary & Compliance
This screw conforms to UNC thread standards with a Class 2A tolerance for consistent fit and function. Key dimensional specifications include a 1/4"-20 thread size, 1/2" length, and a 0.813" flange diameter. The product is manufactured to meet RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) compliance, ensuring it is free of restricted hazardous substances and suitable for use in regulated industrial and consumer goods markets.
