S-90910A817 4-40 x 3/4" ASME B18.3, ASTM F835 Steel Button Head Torx Plus Screws
Steel Button Head Torx Plus 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 zinc plating that protects against rust in demanding industrial environments
- Maximum torque transmission through Torx Plus IP8 drive system, reducing cam-out and tool wear
- Exceptional mechanical strength with 120,000 psi tensile strength and Rockwell C39 hardness for heavy-duty applications
- Precise thread engagement with Class 3A fit ensuring reliable fastening in critical assemblies
- Enhanced clearance and aesthetic appeal from rounded button head design while maintaining low profile
- Full thread coverage along the 3/4" length provides consistent clamping force across the entire fastener
- Regulatory compliance assurance meeting both performance standards and environmental regulations
Professional Applications & Engineering Value
These 4-40 UNC zinc-plated alloy steel screws deliver critical performance advantages in precision engineering applications where vibration resistance and long-term reliability are paramount. The Torx Plus IP8 drive system eliminates the common problem of fastener rounding during high-torque installation, while the Class 3A thread fit ensures precise engagement in tapped holes for consistent clamp load distribution. The combination of 120,000 psi tensile strength and Rockwell C39 hardness makes these rounded head screws ideal for machinery, electronic enclosures, and automotive components where structural integrity cannot be compromised. The fully threaded coarse spacing design allows for rapid installation while maintaining superior holding power in various substrate materials.
Specification Summary & Compliance
Manufactured to exacting ASME B18.3 specifications with Class 3A thread tolerance for precision fit. These 4-40 UNC coarse thread screws feature right-hand threading and comply with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental standards. The zinc-plated alloy steel construction meets ASTM F835 requirements, ensuring consistent performance across industrial applications where regulatory compliance and material traceability are essential.
