S-91255A033 5/16"-18 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 black-oxide coating, extending service life in harsh industrial environments
- Exceptional tensile strength (120,000 PSI) for reliable performance in high-stress applications
- Precision Class 3A thread fit ensures secure fastening and vibration resistance
- Fully threaded design provides maximum grip and load distribution across the entire fastener length
- Hex drive compatibility allows for high-torque installation with standard tools
- Coarse UNC threading enables quick assembly and reduced cross-threading risks
- Comprehensive regulatory compliance meets ASME, ASTM, RoHS 3, and REACH standards for global acceptance
Professional Applications & Engineering Value
These black-oxide alloy steel rounded head hex screws deliver critical performance advantages for demanding industrial applications. The Rockwell C39 hardness and 120,000 PSI tensile strength make them ideal for heavy machinery, automotive assemblies, and structural frameworks where vibration resistance and load-bearing capacity are paramount. The fully threaded UNC coarse thread design ensures rapid installation in production environments while maintaining Class 3A precision fit for secure fastening. The corrosion-resistant black-oxide surface treatment protects against environmental degradation, extending maintenance intervals in outdoor equipment, manufacturing facilities, and transportation applications. These high-strength screws provide engineers with reliable fastening solutions that withstand extreme operational stresses while meeting rigorous industry standards.
Specification Summary & Compliance
Manufactured to exacting Class 3A thread fit tolerances with UNC coarse threading (5/16"-18). Compliant 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 standards. Features fully threaded design with right-hand thread direction and hex drive configuration for standardized installation.
