S-98164A547 1/2"-20 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
- Superior corrosion resistance with 316 stainless steel construction, ideal for harsh industrial environments and chemical exposure.
- Enhanced thread engagement and vibration resistance due to Class 3A UNF fine threading, ensuring reliable, secure fastening in critical applications.
- High tensile strength of 70,000 psi combined with Rockwell B55 hardness for exceptional durability and load-bearing capacity.
- Easy installation and removal with a 5/16" hex drive, providing a firm grip and reducing tool slippage during assembly.
- Improved chemical resistance and longevity from the passivated finish, which enhances the natural oxide layer of the stainless steel.
- Full threading along the 1-1/4" length allows for versatile positioning and consistent clamping force across the entire fastener.
- Low-profile, rounded button head design minimizes protrusion, reducing snag risks and improving safety in assembled products.
Professional Applications & Engineering Value
This 316 stainless steel rounded head screw is engineered to address common industrial challenges, such as corrosion in marine, chemical processing, and food-grade environments. The UNF Class 3A fine thread provides precise fit and superior resistance to loosening under vibration, making it ideal for machinery, automotive assemblies, and precision equipment. With a passivated finish, it offers an added layer of protection against oxidants, extending service life in demanding conditions. The combination of 70,000 psi tensile strength and a hex drive ensures reliable performance in high-stress applications, reducing maintenance needs and downtime for B2B clients.
Specification Summary & Compliance
This screw meets ASME B18.3 and ASTM F879 specifications, with precise Class 3A thread fit and UNF 1/2"-20 fine threading. It is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring environmental safety and suitability for global industrial markets. Dimensions include a length of 1-1/4", head diameter of 0.875", and right-hand thread direction, all manufactured to strict quality standards.
