S-91253A734 1/2"-13 x 5 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 high-stress industrial applications
- Superior corrosion resistance with black-oxide coating on alloy steel for extended service life in demanding environments
- Precision Class 3A thread fit guarantees secure fastening and vibration resistance in critical assemblies
- Optimized 82° countersink angle provides flush mounting and improved load distribution
- Heavy-duty 5/16" hex drive enables high-torque installation without stripping or cam-out
- Partially threaded design allows for precise clamping force control in multi-material applications
- Rockwell C39 hardness rating maintains thread integrity and prevents deformation under repeated use
Professional Applications & Engineering Value
These 1/2"-13 UNC flat head screws deliver critical engineering solutions for industrial assembly challenges. The black-oxide alloy steel construction combined with Class 3A thread fit addresses common issues of vibration loosening and material fatigue in heavy machinery, structural frameworks, and equipment manufacturing. The coarse thread spacing and partial threading provide superior holding power in both metallic and composite materials, while the 82° countersink angle ensures seamless integration for flush-mounted applications. Engineered to withstand extreme mechanical stresses, these hex drive screws are ideal for applications requiring repeated disassembly and reassembly without compromising fastener integrity.
Specification Summary & Compliance
Manufactured to exacting Class 3A thread tolerance standards with UNC coarse thread profile and 1/2"-13 thread size. These fasteners meet ASTM F835 specifications for mechanical properties and dimensional requirements. Fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations, ensuring safe use in regulated industries. The 5 1/2" length with 1 1/2" minimum thread length provides consistent engagement across various material thicknesses.
