S-92949A331 5-40 x 5/8" 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, ensuring long-term reliability in harsh environments.
- High tensile strength of 70,000 psi combined with Rockwell B55 hardness for dependable performance under heavy loads and vibration.
- Precise Class 3A thread fit guarantees secure fastening and reduces the risk of cross-threading in critical assemblies.
- Hex drive design with 5/64" drive size provides excellent torque transmission and prevents stripping during installation.
- Fully threaded coarse UNC thread enables faster installation and stronger holding power in various materials.
- Rounded button head profile offers a low-profile, aesthetically pleasing finish while minimizing snagging risks.
- Compliance with ASME B18.3, RoHS 3, and REACH ensures meeting industry standards and environmental regulations for global applications.
Professional Applications & Engineering Value
Engineered for demanding industrial environments, this 5-40 UNC rounded head screw delivers exceptional value in machinery assembly, electronic enclosures, and precision equipment. The 18-8 stainless steel material with passivated finish provides reliable corrosion resistance, addressing common failure points in humid or chemical-exposed settings. Its coarse thread design and Class 3A thread fit ensure rapid, secure installations while maintaining alignment accuracy—critical in high-vibration applications. The hex drive configuration allows for high-torque applications without cam-out, reducing assembly time and tool wear. These features make it ideal for heavy-duty fastening where consistent performance and regulatory compliance are paramount.
Specification Summary & Compliance
This screw maintains precise Class 3A thread fit per UNC standards, with a diameter of 0.125" and coarse thread spacing. Manufacturing follows ASME B18.3 specifications for dimensional consistency. It is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring adherence to environmental and safety standards for industrial use.
