S-91253A755 1/2"-13 x 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
- Superior corrosion resistance with black-oxide coating, extending service life in demanding industrial environments
- Exceptional tensile strength of 130,000 PSI ensures reliable performance under high-stress applications
- Precision Class 3A thread fit provides secure, vibration-resistant fastening with minimal backlash
- Optimized partial threading allows for concentrated grip strength where needed most
- 82° countersink angle enables flush mounting for cleaner installations and reduced snag hazards
- Heavy-duty Rockwell C39 hardness maintains structural integrity through repeated installation cycles
- 5/16" hex drive facilitates high-torque installation with standard industrial tools
Professional Applications & Engineering Value
This black-oxide alloy steel flat head screw delivers critical performance advantages for heavy-duty industrial applications where vibration resistance and structural integrity are paramount. The UNC coarse thread profile combined with Class 3A precision threading ensures rapid installation and superior holding power in structural steel, heavy machinery, and construction applications. The partial threading design concentrates thread engagement at critical stress points while the 82° countersink angle provides seamless flush mounting in predrilled surfaces. Engineered to withstand extreme mechanical stress with its 130,000 PSI tensile strength, this fastener solves common industrial challenges including joint relaxation, vibration-induced loosening, and environmental degradation.
Specification Summary & Compliance
This 1/2"-13 UNC flat head screw features Class 3A thread fit tolerances with partial threading extending to a minimum of 1½". Manufacturing specifications comply with ASTM F835 standards for mechanical properties and dimensional requirements. The product is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations, ensuring safe use across industrial sectors.
