S-91253A975 5/16"-24 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
- Exceptional durability with 130,000 psi tensile strength and Rockwell C39 hardness for reliable performance in demanding applications
- Superior corrosion resistance through black-oxide coating that protects against rust and extends service life
- Precise Class 3A thread fit ensures tight tolerances and secure fastening in critical assemblies
- Efficient hex drive installation with 3/16" drive size for easy torque application and reduced installation time
- Optimal flush mounting with 82° countersink angle and standard flat head profile for smooth surface finishes
- Full threading coverage along the 1-1/8" length provides maximum grip strength and load distribution
- Regulatory compliance with ASTM F835, RoHS 3, and REACH standards for safe, quality-assured industrial use
Professional Applications & Engineering Value
These 5/16"-24 UNF flat head screws deliver critical engineering solutions where high tensile strength and precise fit are paramount. The black-oxide alloy steel construction provides excellent corrosion protection in harsh environments, while the fine thread spacing and Class 3A thread fit maintain vibration resistance in dynamic applications. The hex drive design enables high-torque installation without cam-out, making them ideal for machinery, automotive assemblies, and heavy equipment where flush mounting is required. Their fully threaded configuration ensures maximum engagement in both soft and hard materials, reducing the risk of loosening under stress while maintaining ASTM F835 compliance for consistent quality across industrial fastening applications.
Specification Summary & Compliance
Manufactured to precise Class 3A thread fit standards with UNF fine threading (5/16"-24) and right-hand thread direction. The screws feature a standard 82° countersink angle and are produced in accordance with ASTM F835 specifications. Compliance includes RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring environmental safety and material restrictions are met for industrial distribution and use.
