S-92949A855 5/16"-18 x 1 5/8" 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 construction and passivated finish, ideal for harsh industrial environments
- Exceptional mechanical strength with 70,000 psi tensile strength and Rockwell B55 hardness for heavy-duty applications
- Precise Class 3A thread fit ensures secure, vibration-resistant connections in critical assemblies
- Quick installation and removal with 3/16" hex drive design, reducing assembly time and tool slippage
- Reliable coarse thread engagement with UNC threading for faster driving and reduced cross-threading risks
- Full threading along 1-5/8" length provides maximum grip and load distribution across the entire fastener
- Rounded button head profile offers a low-profile, finished appearance while minimizing snagging hazards
Professional Applications & Engineering Value
This 18-8 stainless steel rounded head screw delivers critical performance in demanding industrial settings where corrosion resistance and mechanical reliability are paramount. The combination of Class 3A UNC coarse threads and fully threaded design ensures rapid installation in machinery, structural frameworks, and equipment assemblies while maintaining vibration resistance under dynamic loads. The passivated finish enhances surface durability against chemical exposure and oxidation, extending service life in manufacturing, marine, and outdoor applications. With its hex drive compatibility and rounded button head profile, it provides both installation efficiency and safety in confined spaces where protruding fastener heads pose operational risks.
Specification Summary & Compliance
Manufactured to ASME B18.3 specifications with Class 3A thread fit for precision tolerance. Features 5/16"-18 UNC coarse thread with full threading along 1-5/8" length. Compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations, ensuring safe use in regulated industries.
