S-98164A436 5-40 x 1/4" 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 316 stainless steel construction and passivated finish, ideal for harsh chemical and marine environments
- Precise thread engagement through Class 3A thread fit and UNC coarse threading, ensuring reliable fastening in industrial applications
- High mechanical strength with 70,000 psi tensile strength and Rockwell B55 hardness, providing exceptional load-bearing capacity
- Secure installation with 5/64" hex drive design, preventing cam-out and enabling efficient torque application
- Full-threaded design offering maximum grip length and uniform stress distribution across the entire fastener
- Rounded button head profile creating a low-profile, aesthetically pleasing finish while minimizing snagging hazards
- Regulatory compliance meeting ASME B18.3, RoHS 3, and REACH standards for global industrial acceptance
Professional Applications & Engineering Value
Engineered for demanding industrial environments, these 316 stainless steel rounded head screws deliver exceptional performance where corrosion resistance and mechanical reliability are critical. The passivated finish significantly enhances surface protection against chlorides, acids, and extreme temperatures, making them ideal for chemical processing, marine equipment, and food-grade applications. The 5-40 UNC coarse thread configuration ensures rapid installation and superior vibration resistance, while the Class 3A thread fit provides precise tolerances for high-integrity assemblies. The combination of 70,000 psi tensile strength and fully threaded design creates a robust fastening solution that maintains structural integrity under dynamic loads and thermal cycling conditions.
Specification Summary & Compliance
These rounded head screws feature precise Class 3A thread fit with 5-40 UNC coarse threading and dimensional compliance with ASME B18.3 specifications. Manufacturing standards ensure consistent 1/4" length, 0.125" thread diameter, and 0.238" head diameter tolerances. The fasteners are fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations, containing no restricted substances above threshold limits.
