S-91253A142 4-48 x 3/8" 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
- High tensile strength of 130,000 psi ensures reliable performance in demanding industrial environments, reducing the risk of fastener failure.
- Black-oxide coating on alloy steel provides excellent corrosion resistance, extending the screw's service life in harsh conditions.
- Class 3A thread fit offers superior precision and tight tolerances for secure, vibration-resistant assemblies.
- Fine UNF threading delivers enhanced grip and load distribution, ideal for applications requiring fine adjustments.
- 82° countersink angle with standard flat head allows for flush mounting, minimizing protrusion and improving aesthetics.
- Hex drive (1/16") design facilitates easy installation and removal with standard tools, boosting assembly efficiency.
- Full threading along the 3/8" length ensures maximum engagement and holding power across the entire fastener.
Professional Applications & Engineering Value
This 4-48 UNF flat head screw is engineered to address critical challenges in precision machinery and industrial equipment. The black-oxide alloy steel construction, combined with a Rockwell C39 hardness, resists wear and environmental degradation, making it suitable for high-stress applications like automotive assemblies, electronic enclosures, and aerospace components. The fine thread and Class 3A fit provide exceptional vibration resistance and sealing capabilities, reducing maintenance needs in dynamic environments. With its hex drive and fully threaded design, it ensures quick, secure installations, enhancing productivity while meeting stringent ASTM F835 standards for reliability.
Specification Summary & Compliance
This screw adheres to precise dimensional tolerances, including a Class 3A thread fit and UNF fine thread standard, ensuring consistent performance. It is manufactured in compliance with ASTM F835 specifications and is fully RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) compliant, supporting environmentally responsible and safe industrial use.
