S-91255A638 3/8"-16 x 3" ASTM F835 Steel Button Head Hex-Drive Screws
Steel Button Head Hex-Drive 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 120,000 psi ensures reliable performance in demanding heavy-duty applications, reducing the risk of fastener failure.
- Black-oxide coating on alloy steel provides enhanced corrosion resistance, extending the screw's service life in harsh industrial environments.
- Class 3A thread fit offers precise, tight tolerances for secure fastening and vibration resistance in critical assemblies.
- Fully threaded design with UNC coarse threads allows for faster installation and superior grip in a wide range of materials.
- Rockwell C39 hardness delivers excellent durability and wear resistance, maintaining integrity under high-stress conditions.
- Hex drive (7/32") compatibility enables easy installation and removal with standard tools, improving assembly efficiency.
- Rounded button head profile reduces surface damage and provides a low-profile, aesthetically pleasing finish.
Professional Applications & Engineering Value
This 3/8"-16 UNC black-oxide alloy steel rounded head hex screw is engineered to address common industrial challenges such as corrosion, vibration loosening, and high mechanical stress. The black-oxide surface treatment significantly enhances corrosion resistance, making it ideal for outdoor or humid environments. With a coarse thread and Class 3A fit, it ensures quick, secure fastening in metal, wood, and composite materials, reducing assembly time and improving joint reliability. Its fully threaded design and high tensile strength provide uniform load distribution, preventing shear and fatigue in heavy machinery, automotive, and construction applications. This screw delivers consistent performance where durability and compliance with strict industry standards are paramount.
Specification Summary & Compliance
This screw features precise Class 3A thread fit and adheres to UNC coarse thread standards with a thread size of 3/8"-16. It is manufactured in compliance with ASME B18.3 and ASTM F835 specifications, ensuring dimensional accuracy and mechanical reliability. The product is also RoHS 3 (2015/863/EU) Compliant and REACH (EC 1907/2006) Compliant, meeting environmental and safety regulations for use in various global markets.
