S-94414A323 4-40 x 5/8" ASME B18.3, ASTM F835 Alloy Steel Torx Flat Head Screws
Alloy Steel Torx Flat Head 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
- Enhanced torque transmission and reduced cam-out with Torx Plus IP10 drive for reliable fastening in high-stress applications
- Superior corrosion resistance and durability thanks to black-oxide coating on alloy steel, extending service life in harsh environments
- Exceptional tensile strength of 140,000 psi combined with Rockwell C39 hardness for heavy-duty load-bearing and vibration resistance
- Precise Class 3A thread fit ensures secure mating with nuts and threaded holes, minimizing loosening and improving assembly accuracy
- Fully threaded design with 82° countersink allows for flush mounting and uniform stress distribution in thin materials
- Compliance with ASME B18.3, RoHS 3, and REACH guarantees adherence to industrial safety and environmental standards
- Coarse UNC threading and right-hand direction facilitate quick installation and disassembly in various materials
Professional Applications & Engineering Value
These 4-40 UNC flat head screws are engineered to address common industrial challenges such as fastener failure under high vibration and corrosive conditions. The black-oxide alloy steel construction provides a protective barrier against oxidation, while the Torx Plus drive minimizes tool slippage during high-torque applications, ensuring consistent performance in assembly lines. Ideal for precision machinery, automotive components, and electronic enclosures, the screws' fully threaded design and 82° countersink angle enable seamless integration into thin panels, reducing the risk of material splitting. By combining high tensile strength with rigorous compliance, these fasteners deliver reliable, long-term solutions for demanding engineering projects.
Specification Summary & Compliance
This product features a Class 3A thread fit with UNC coarse threading, ensuring tight tolerances per ASME standards. Dimensions include a 5/8" length, 0.255" head diameter, and IP10/T10 drive size. It meets ASME B18.3 specifications for dimensional accuracy and is compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, confirming the absence of hazardous substances for safe industrial use.
