S-91253A973 5/16"-18 x 1 1/8" ASTM F835 Alloy Steel Hex Drive Flat Head Screws
Alloy Steel Hex Drive 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 black-oxide finish, extending service life in demanding industrial environments
- Exceptional mechanical strength with 130,000 PSI tensile rating and Rockwell C39 hardness for heavy-duty applications
- Precision Class 3A thread fit ensures secure fastening with minimal vibration loosening in critical assemblies
- Full-length threading provides maximum engagement depth and load distribution across the entire fastener length
- Standard 82° countersink angle enables flush mounting in chamfered holes for clean, professional installations
- Hex drive compatibility with 3/16" drive tools allows for high-torque installation in confined spaces
- Regulatory compliance with ASTM F835, RoHS 3, and REACH ensures material safety and performance reliability
Professional Applications & Engineering Value
This black-oxide alloy steel flat head socket cap screw delivers critical performance advantages for industrial machinery, automotive assemblies, and heavy equipment applications. The combination of 5/16"-18 UNC coarse threading and Class 3A thread fit provides superior vibration resistance while maintaining easy installation in high-volume production environments. The fully threaded design maximizes pull-out strength in tapped holes, while the 82° countersink angle ensures seamless integration with standard chamfered openings. Engineered with 130,000 PSI tensile strength, these flat head screws withstand extreme mechanical stresses without compromising joint integrity, making them ideal for structural components subject to dynamic loads and thermal cycling.
Specification Summary & Compliance
Manufactured to precise dimensional standards with Class 3A thread fit and UNC coarse thread spacing for optimal engagement in industrial applications. The black-oxide alloy steel construction meets ASTM F835 specifications for mechanical properties and performance. Compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations, ensuring material safety and regulatory acceptance for global industrial markets.
