S-91253A143 4-48 x 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
- Superior corrosion resistance with Black-Oxide finish, extending service life in harsh industrial environments
- Exceptional tensile strength of 130,000 psi ensures reliable performance under heavy loads and vibration
- Precision Class 3A thread fit provides secure fastening with minimal play in critical assemblies
- Optimized flush mounting with 82° countersink angle for seamless integration in precision applications
- Enhanced drive stability through hex drive design prevents stripping during high-torque installation
- Full threading capability allows maximum grip length and adjustment flexibility
- Regulatory compliance assurance meets ASTM F835, RoHS 3, and REACH standards for global industrial use
Professional Applications & Engineering Value
These 4-48 UNF fine thread flat head screws deliver critical performance advantages in precision engineering applications where space constraints and material integrity are paramount. The Black-Oxide Alloy Steel construction combined with Rockwell C39 hardness provides exceptional resistance to wear and environmental degradation, making them ideal for aerospace components, electronic enclosures, and precision instrumentation. The fine UNF thread profile ensures superior vibration resistance and load distribution in thin-section materials, while the 82° countersink angle enables perfect flush mounting in machined surfaces. Engineered to maintain dimensional stability under extreme conditions, these screws solve common industrial challenges including galvanic corrosion, thread stripping, and installation inconsistency in automated assembly processes.
Specification Summary & Compliance
Manufactured to exacting Class 3A thread fit tolerances with UNF fine thread specifications (4-48) in the inch system. The fully threaded design maintains consistent engagement across the entire 1/2" length. Compliance includes ASTM F835 mechanical properties, RoHS 3 (2015/863/EU) environmental directives, and REACH (EC 1907/2006) chemical substance regulations, ensuring global acceptability for industrial and commercial applications requiring certified fastener solutions.
