S-91253A730 1/2"-13 x 4 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 applications
- Superior corrosion resistance from black-oxide coating extends service life in harsh environments
- Precise Class 3A thread fit provides secure fastening with minimal vibration loosening
- Coarse UNC threading enables quick installation and superior grip in various materials
- 82° countersink angle allows for flush mounting in standard countersunk holes
- Partially threaded design offers optimal clamping force distribution
- Hex drive compatibility with 5/16" tools ensures easy installation and removal
Professional Applications & Engineering Value
These black-oxide alloy steel flat head screws deliver exceptional engineering value in industrial applications where corrosion resistance and high tensile strength are critical. The 1/2"-13 UNC coarse threading provides superior holding power in metal fabrication, machinery assembly, and structural applications. The partially threaded design concentrates clamping force precisely where needed, while the 82° countersink angle ensures seamless flush mounting in standardized applications. Engineered to withstand heavy loads and harsh environmental conditions, these hex drive screws offer reliable fastening solutions for construction equipment, industrial machinery, and automotive applications where vibration resistance and long-term durability are paramount.
Specification Summary & Compliance
Manufactured to exacting standards with Class 3A thread fit precision and UNC coarse threading specifications. These 4 1/2" length screws feature Rockwell C39 hardness and comply with ASTM F835 manufacturing standards. Fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations, ensuring safe use across global industrial markets. The black-oxide surface treatment provides consistent corrosion protection while maintaining dimensional accuracy across all critical parameters.
