S-92949A811 4-40 x 9/16" 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 thanks to 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 reliable performance under high stress
- Precision thread engagement with Class 3A thread fit ensuring secure fastening and vibration resistance in critical assemblies
- Easy installation and removal with hex drive design providing positive torque transmission and reduced tool slippage
- Full thread coverage along the 9/16" length for maximum grip and load distribution across the entire fastener
- Compliant with industry standards including ASME B18.3, RoHS 3, and REACH for guaranteed quality and environmental safety
- Versatile coarse UNC threading enabling quick assembly and disassembly in various industrial applications
Professional Applications & Engineering Value
These 4-40 UNC thread rounded head screws deliver critical performance in demanding environments where corrosion resistance and mechanical reliability are paramount. The 18-8 stainless steel material combined with passivated finish provides excellent protection against oxidation and chemical exposure, making them ideal for machinery, electronic enclosures, and outdoor equipment. The hex drive design ensures secure tool engagement during high-torque applications, while the fully threaded configuration maximizes holding power in thin materials and tight spaces. With 70,000 psi tensile strength and Class 3A thread fit, these fasteners maintain structural integrity in vibration-prone assemblies, reducing maintenance frequency and downtime in industrial operations.
Specification Summary & Compliance
This rounded head screw features precise 4-40 UNC coarse threading with Class 3A thread fit for superior dimensional accuracy. Manufacturing complies with ASME B18.3 specifications (ASTM F879) ensuring consistent quality and interchangeability. The product is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, meeting current environmental and safety standards for industrial components.
