S-92949A756 1/2"-20 x 1 1/2" ASME B18.3 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 construction and passivated finish, ideal for harsh environments
- Exceptional thread precision with Class 3A fit and UNF fine threads for reliable, vibration-resistant connections
- High mechanical strength offering 70,000 psi tensile strength and Rockwell B55 hardness for demanding applications
- Secure and efficient installation enabled by the 5/16" hex drive and fully threaded design
- Enhanced safety and low-profile design from the rounded button head, reducing snagging risks
- Full regulatory compliance meeting ASME B18.3 standards, RoHS 3, and REACH for global use
- Consistent performance in inch measurements with precise dimensions for repeatable assembly
Professional Applications & Engineering Value
This 1/2"-20 UNF Class 3A Rounded Head Screw is engineered to address critical industrial challenges, such as vibration loosening and corrosion in machinery, automotive, and electronics assemblies. The 18-8 stainless steel material, combined with a passivated finish, ensures long-term durability in moist or chemical-exposed settings. Its fine UNF threads and Class 3A fit provide superior clamping force and fatigue resistance, minimizing maintenance needs. The hex drive and rounded button head facilitate quick, tool-accessible installation in confined spaces, enhancing productivity while maintaining a sleek, safe profile. Ideal for OEMs and MRO professionals, this screw delivers reliable performance where precision and compliance—such as ASME B18.3 standards—are non-negotiable.
Specification Summary & Compliance
This screw adheres to Class 3A thread tolerances and UNF fine threading with a 1/2"-20 size, ensuring precise fit. Manufactured per ASME B18.3 specifications, it includes full compliance with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, supporting environmentally safe and globally accepted usage. Dimensions include a 1 1/2" length, 0.875" head diameter, and consistent inch-system measurements for reliability across industrial applications.
