S-98164A511 2-56 x 1/2" 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 in harsh environments thanks to 316 stainless steel construction and passivated finish
- Exceptional mechanical strength with a 70,000 psi tensile strength and Rockwell B55 hardness for reliable, long-term performance
- Precise and secure fastening ensured by the Class 3A thread fit and coarse UNC thread for reduced cross-threading
- Efficient installation and removal with the internal 0.050" hex drive, providing a positive grip and high torque transfer
- Full thread engagement along the entire 1/2" length for maximum holding power in a wide range of material thicknesses
- Compliance with major industry standards including ASME B18.3, ensuring consistent quality and interchangeability
- Environmentally responsible manufacturing that is fully RoHS 3 and REACH compliant
Professional Applications & Engineering Value
Engineered for demanding applications, these 316 stainless steel rounded head screws provide a robust solution for industries where corrosion resistance is critical, such as marine, chemical processing, and food equipment. The combination of high tensile strength and a passivated finish ensures durability against stress and corrosive agents, preventing fastener failure. The Class 3A UNC thread fit offers superior thread engagement and vibration resistance, making these fully threaded screws ideal for securing components in assemblies subject to dynamic loads. The button head style with a hex drive allows for a low-profile, high-strength connection that is both easy to install and aesthetically clean, solving common challenges of maintenance access and joint integrity in industrial fasteners.
Specification Summary & Compliance
This screw features a 2-56 UNC coarse thread with a precision Class 3A thread fit for excellent dimensional accuracy. It is manufactured in compliance with the ASME B18.3 specification and adheres to RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations, confirming its suitability for global markets and restricted substance control.
