S-92949A880 1/2"-13 x 3 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 18-8 stainless steel and passivated finish for long-lasting performance in harsh environments.
- High tensile strength of 70,000 psi ensures reliable load-bearing capacity and reduces the risk of fastener failure.
- Precise Class 3A thread fit provides secure, vibration-resistant connections with minimal backlash.
- 5/16" hex drive design allows for high-torque installation and easy maintenance with standard tools.
- Fully threaded shank offers consistent clamping force along the entire 3 1/4" length for uniform stress distribution.
- Rockwell B55 hardness maintains thread integrity and resists wear during repeated use.
- Compliance with ASME B18.3, ASTM F879, RoHS 3, and REACH guarantees quality and environmental safety for regulated industries.
Professional Applications & Engineering Value
This 18-8 stainless steel rounded head screw is engineered to address critical challenges in heavy machinery, structural assemblies, and corrosive environments. The 1/2"-13 UNC coarse threading and Class 3A thread fit ensure rapid installation and superior vibration resistance, reducing maintenance downtime. The passivated finish enhances the innate corrosion resistance of stainless steel, making it ideal for outdoor, marine, or chemical exposure applications. With a 70,000 psi tensile strength and fully threaded design, it distributes clamping force evenly, preventing joint loosening in high-stress industrial settings. The button head and hex drive provide a low-profile, tool-accessible solution for confined spaces, supporting efficient assembly in automotive, construction, and manufacturing sectors.
Specification Summary & Compliance
This screw adheres to Class 3A thread fit tolerances per UNC standards, ensuring precise engagement. Manufacturing complies with ASME B18.3 and ASTM F879 specifications for dimensional accuracy and performance. It is fully RoHS 3 (2015/863/EU) Compliant and REACH (EC 1907/2006) Compliant, meeting stringent environmental and safety regulations for industrial use.
