S-91253A962 7/8"-9 x 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 load-bearing capacity with 130,000 psi tensile strength for reliable performance in demanding applications
- Superior thread engagement due to Class 3A fit UNC coarse threads ensuring precise, vibration-resistant connections
- Enhanced durability from alloy steel construction with Rockwell C37 hardness for long service life
- Optimized flush mounting with 82° countersink angle and standard flat head profile for seamless surface integration
- Secure installation control through 9/16" hex drive design providing positive torque application
- Versatile partial threading allowing flexibility in clamping force distribution across the 4" length
- Regulatory compliance assurance meeting ASTM F835, RoHS 3, and REACH standards for quality and environmental safety
Professional Applications & Engineering Value
These alloy steel flat head screws deliver critical engineering solutions for heavy-duty industrial applications where vibration resistance and structural integrity are paramount. The 7/8"-9 UNC coarse thread configuration with Class 3A fit provides superior thread engagement in steel frameworks, construction equipment, and machinery assemblies, preventing loosening under dynamic loads. The partially threaded design allows precise clamping force concentration while the 82° countersink angle ensures flush mounting in structural components. Manufactured from high-strength alloy steel with 130,000 psi tensile strength, these flat head screws withstand extreme mechanical stresses in construction, manufacturing, and infrastructure projects where failure is not an option.
Specification Summary & Compliance
This 4" flat head screw features precise Class 3A thread fit with 7/8"-9 UNC coarse threads and 2 1/2" minimum thread length. Manufactured to ASTM F835 specifications with Rockwell C37 hardness and 130,000 psi tensile strength. Compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations, ensuring safe use across industrial sectors while maintaining exceptional mechanical properties.
