S-91263A579 5/16"-18 x 2 1/2" 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 in demanding industrial applications.
- Superior corrosion resistance with zinc-plated alloy steel construction for extended service life in harsh environments.
- Precise Class 3A thread fit guarantees secure, vibration-resistant connections with minimal risk of loosening.
- Optimized 82° countersink angle allows for flush mounting, creating smooth surfaces and reducing snag hazards.
- Partially threaded shank design provides enhanced grip and clamping force where it's needed most.
- Hex drive compatibility with 3/16" drive size enables quick installation and high-torque application.
- Full regulatory compliance with ASTM F835, RoHS 3, and REACH standards ensures environmental and safety adherence.
Professional Applications & Engineering Value
These 5/16"-18 UNC flat head screws are engineered to solve critical fastening challenges in industrial settings. The zinc-plated alloy steel construction provides excellent corrosion protection while maintaining Rockwell C39 hardness for durability against wear and deformation. The coarse thread design ensures rapid installation and superior holding power in various materials, while the partially threaded configuration concentrates clamping force precisely where needed. The 82° countersink angle creates seamless flush mounting in machinery, equipment frames, and structural assemblies, eliminating protrusions that could interfere with operation or safety. These industrial screws deliver reliable performance in heavy-duty applications where vibration resistance and long-term integrity are paramount.
Specification Summary & Compliance
Manufactured to exacting standards with Class 3A thread fit for superior precision and UNC coarse thread specification. These 2 1/2" length screws feature a minimum thread length of 1 1/8" and are compliant with ASTM F835 specifications for mechanical properties. The products meet RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations, ensuring safe use across various industrial sectors while maintaining consistent dimensional accuracy and performance reliability.
