S-91253A644 3/8"-16 x 4" 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 industrial applications, reducing failure risks.
- Class 3A thread fit provides precise, tight tolerances for secure fastening and vibration resistance in machinery assemblies.
- Black-oxide coating on alloy steel enhances corrosion resistance, extending service life in harsh environments.
- Partially threaded design with 82° countersink angle allows for flush mounting and improved load distribution in structural components.
- Hex drive (7/32") enables easy installation with standard tools, minimizing assembly time and labor costs.
- Rockwell C39 hardness offers superior durability against wear and deformation under high-stress conditions.
- Compliance with ASTM F835, RoHS 3, and REACH ensures adherence to industry standards and environmental safety for global supply chains.
Professional Applications & Engineering Value
These 3/8"-16 UNC flat head screws are engineered to address critical challenges in heavy-duty industrial settings, such as machinery construction, automotive assemblies, and structural frameworks. The black-oxide alloy steel construction combats corrosion and wear, while the coarse thread and Class 3A fit provide superior grip and resistance to loosening under dynamic loads. The partially threaded design with an 82° countersink angle ensures a secure, flush fit in countersunk holes, distributing stress evenly and preventing surface damage. Ideal for applications requiring high tensile strength and reliability, these screws minimize maintenance needs and enhance operational safety in demanding environments.
Specification Summary & Compliance
This product features a 3/8"-16 UNC coarse thread with Class 3A precision fit for tight tolerances, a length of 4 inches, and a partially threaded configuration. It complies with ASTM F835 specifications for mechanical properties and is verified to meet RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental standards, ensuring safety and regulatory adherence in industrial use.
