S-91253A381 1/2"-20 x 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
- Superior corrosion resistance with black-oxide finish for extended service life in harsh industrial environments
- Maximum load-bearing capacity with 130,000 PSI tensile strength and Rockwell C39 hardness for critical applications
- Precise thread engagement with Class 3A fit ensuring reliable fastening in high-vibration settings
- Optimal flush mounting with 82° countersink angle and flat head design for smooth surface finishes
- Enhanced torque transmission through 5/16" hex drive for secure installation without stripping
- Full-threaded versatility allowing consistent clamping force along the entire 2" length
- Regulatory compliance assurance meeting ASME B18.3 and ASTM F835 standards for quality and safety
Professional Applications & Engineering Value
Engineered for demanding industrial applications, these black-oxide alloy steel flat head screws solve critical challenges in machinery assembly and structural fastening. The UNF fine thread spacing provides superior resistance to vibrational loosening compared to coarse threads, while the Class 3A thread fit ensures precise alignment in CNC-machined components. The fully threaded design distributes clamping force evenly across the entire 2" length, preventing joint failure in high-stress environments. The 82° countersink angle creates seamless flush mounting in precision equipment, eliminating protrusions that could interfere with moving parts. These socket cap screws deliver reliable performance in automotive, aerospace, and heavy equipment applications where high tensile strength and dimensional accuracy are non-negotiable requirements.
Specification Summary & Compliance
This 1/2"-20 UNF flat head socket cap screw maintains precision Class 3A thread tolerances with fine thread spacing for optimal engagement. Manufacturing complies with ASME B18.3 and ASTM F835 specifications, ensuring dimensional consistency and mechanical properties. The product is fully RoHS 3 (2015/863/EU) Compliant and REACH (EC 1907/2006) Compliant, meeting international environmental and safety standards for industrial components.
