S-91253A454 7/16"-20 x 1 1/4" 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
- Exceptional tensile strength of 130,000 psi ensures reliable performance under high-stress industrial applications
- Superior corrosion resistance from black-oxide coating extends service life in demanding environments
- Precision Class 3A threading provides superior fit and vibration resistance in critical assemblies
- 82° countersink angle delivers flush mounting for streamlined surfaces and improved aesthetics
- Full compliance with ASTM F835 guarantees consistent quality and mechanical properties
- Rockwell C39 hardness maintains thread integrity through repeated installation cycles
- 1/4" hex drive enables secure tool engagement and efficient installation in confined spaces
Professional Applications & Engineering Value
This 7/16"-20 UNF flat head screw delivers critical engineering solutions where high-strength fastening meets precision requirements. The black-oxide alloy steel construction provides superior corrosion protection while maintaining the 130,000 psi tensile strength needed for heavy machinery, automotive systems, and structural applications. The Class 3A fine threading ensures optimal clamp load distribution and vibration resistance, preventing loosening in dynamic environments. With its 82° countersink angle and fully threaded design, this fastener achieves seamless flush mounting while maximizing thread engagement in thin materials and critical assemblies where reliability is paramount.
Specification Summary & Compliance
Manufactured to exact inch system dimensions with Class 3A thread fit precision and UNF fine threading standards. This flat head screw complies with ASTM F835 specifications for mechanical properties and meets RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations. The combination of Rockwell C39 hardness and precise 1-1/4" length tolerance ensures consistent performance across industrial applications requiring reliable, high-strength fastening solutions.
