S-91306A278 1/4"-20 x 5/16" 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
- Superior corrosion resistance with zinc-plated alloy steel construction for extended service life in harsh industrial environments
- Exceptional mechanical strength with 120,000 psi tensile strength and Rockwell C39 hardness to withstand high-stress applications
- Precision thread engagement with Class 3A UNC coarse threads ensuring reliable fastening and vibration resistance
- Efficient installation through 5/32" hex drive design providing secure tool engagement and reduced stripping risk
- Versatile rounded button head profile offering a low-profile finish while maintaining high clamping force distribution
- Full threading coverage along the 5/16" length for maximum grip and adjustment flexibility in assembled components
- Regulatory compliance assurance meeting ASME B18.3, ASTM F835, RoHS 3, and REACH standards for global industrial acceptance
Professional Applications & Engineering Value
Engineered for demanding industrial applications, these zinc-plated alloy steel rounded head screws deliver exceptional performance in machinery assembly, electrical enclosures, and automotive components. The Class 3A UNC coarse thread configuration provides superior resistance to vibrational loosening while maintaining quick assembly times. With 120,000 psi tensile strength and Rockwell C39 hardness, these fasteners prevent thread deformation under extreme loads. The hex drive design ensures positive torque transmission during installation, reducing the risk of cam-out and damaged drive surfaces. The zinc plating offers reliable corrosion protection, making these fully threaded screws ideal for outdoor equipment and manufacturing environments where durability is critical.
Specification Summary & Compliance
Manufactured to precise dimensional standards with Class 3A thread fit tolerance for consistent performance. Complies with ASME B18.3 and ASTM F835 specifications for dimensional accuracy and mechanical properties. Meets RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental compliance requirements. Features UNC coarse threads (1/4"-20) with 0.437" head diameter and 5/16" length for standardized compatibility across industrial applications.
