S-91306A258 5-40 x 1/2" ASTM F835 Steel Button Head Hex-Drive Screws
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
- Exceptional corrosion resistance with zinc-plated alloy steel construction for extended service life in harsh environments
- Superior thread engagement with Class 3A fit ensuring precise, vibration-resistant fastening in critical assemblies
- High-torque installation capability through 5/64" hex drive design preventing tool slippage and damage
- Optimized load distribution from rounded button head profile reducing surface stress and material fatigue
- Reliable performance under extreme conditions with 120,000 psi tensile strength and Rockwell C39 hardness
- Versatile coarse threading (UNC 5-40) enabling rapid installation and superior pull-out resistance
- Full regulatory compliance meeting ASME B18.3, ASTM F835, RoHS 3, and REACH standards for global applications
Professional Applications & Engineering Value
These zinc-plated alloy steel rounded head screws deliver critical performance advantages in industrial fastening systems where vibration resistance and environmental durability are paramount. The Class 3A thread fit maintains precise tolerances in high-cycle assembly operations, while the fully threaded UNC 5-40 design provides maximum engagement in thin materials and soft substrates. The zinc plating creates a sacrificial barrier against galvanic corrosion, making these button head screws ideal for outdoor equipment, automotive subsystems, and electronic enclosures exposed to moisture and chemical agents. With 120,000 psi tensile strength, they reliably replace standard fasteners in load-bearing applications without requiring upsizing.
Specification Summary & Compliance
Manufactured to ASME B18.3 and ASTM F835 specifications with Class 3A thread tolerances ensuring consistent fit and performance. The 5-40 UNC coarse thread configuration provides optimal thread engagement while the 1/2" length offers versatile application coverage. Full compliance with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations guarantees environmental safety and international market acceptance.
