S-92949A551 1/4"-20 x 2 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 18-8 stainless steel and passivated finish for extended service life in harsh environments
- Exceptional mechanical strength with 70,000 psi tensile strength and Rockwell B55 hardness for reliable load-bearing performance
- Precise thread engagement with Class 3A fit and UNC coarse spacing ensuring vibration resistance and secure fastening
- Optimized installation efficiency through 5/32" hex drive design providing positive torque transmission and reduced cam-out risk
- Enhanced flush-mount capability with rounded button head profile minimizing protrusion in assembled applications
- Full-threaded design delivering consistent clamping force along the entire 2 1/4" length for uniform stress distribution
- Regulatory compliance assurance meeting ASME B18.3 specifications and environmental standards (RoHS 3, REACH)
Professional Applications & Engineering Value
These 18-8 stainless steel rounded head screws deliver critical performance where corrosion resistance and structural integrity are paramount. The passivated finish creates an additional protective oxide layer, significantly enhancing durability in chemical exposure, marine, or high-humidity industrial environments. With 70,000 psi tensile strength and Class 3A thread fit, these fasteners maintain clamping force under dynamic loads and vibration, making them ideal for machinery, equipment assembly, and structural frameworks. The UNC coarse threading provides rapid installation in soft materials and prevents cross-threading, while the hex drive configuration ensures reliable torque application in confined spaces. These fully threaded screws distribute stress evenly across the entire shank, preventing localized failure points in demanding industrial applications.
Specification Summary & Compliance
Manufactured to ASME B18.3 specifications with Class 3A thread fit precision and UNC coarse thread spacing. The 1/4"-20 thread size maintains dimensional accuracy throughout the 2 1/4" length. Full compliance with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations ensures suitability for global industrial markets and restricted substance requirements.
