S-90920A113 4-40 x 3/4" ASME B18.6.3 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
- Superior corrosion resistance with zinc-plated steel construction for extended service life in demanding environments
- Enhanced torque transmission through T8 Torx drive design, reducing cam-out and tool slippage during installation
- High tensile strength rating of 60,000 psi ensures reliable performance under substantial mechanical loads
- Optimal flush mounting with standard 82° countersink angle and flat head profile for clean, professional finishes
- Quick installation efficiency with coarse UNC threading and Class 2A thread fit for smooth engagement
- Full threading along 3/4" length provides maximum grip and uniform stress distribution in assemblies
- Regulatory compliance assurance meeting ASME B18.6.3 specifications and environmental standards
Professional Applications & Engineering Value
These 4-40 UNC zinc-plated steel flat head screws deliver critical engineering solutions where flush surface mounting and high-strength fastening are paramount. The combination of T8 Torx drive and coarse threading addresses common assembly challenges by preventing tool slippage and enabling rapid installation in time-sensitive manufacturing operations. The zinc-plated finish provides essential corrosion protection for industrial equipment, electronic enclosures, and machinery subjected to moderate environmental exposure. With full threading across the entire 3/4" length, these flat head screws maintain consistent clamping force in applications ranging from precision instruments to automotive components, ensuring reliable performance where vibration resistance and structural integrity are critical.
Specification Summary & Compliance
Manufactured to precise Class 2A thread fit tolerances with UNC coarse thread profile and right-hand thread direction. These screws conform to ASME B18.6.3 manufacturing specifications and demonstrate compliance with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations. The 82° countersink angle and standard flat head profile ensure proper seating in appropriately prepared surfaces.
