S-91251A642 3/8"-16 x 4 1/2" ASTM A574 Alloy Steel Socket Head Screws
Alloy Steel Socket 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 170,000 PSI for reliable performance in high-stress applications, reducing the risk of fastener failure.
- Superior corrosion resistance with black-oxide coating, extending service life in demanding industrial environments.
- Precision Class 3A thread fit ensures tight, secure connections and reduces assembly issues in critical machinery.
- High hardness rating (Rockwell C37) provides excellent wear resistance, maintaining integrity through repeated use.
- Partially threaded design with a 1-1/4" minimum thread length allows for controlled clamping force and vibration resistance.
- Coarse UNC threads enable quick installation and are less prone to clogging in dirty or debris-filled conditions.
- Hex socket drive offers high torque capability and easy access in confined spaces, improving assembly efficiency.
Professional Applications & Engineering Value
Engineered for heavy-duty industrial applications, this black-oxide alloy steel socket head cap screw delivers unmatched reliability in machinery, automotive, and construction sectors. The UNC coarse thread and Class 3A thread fit provide precise, vibration-resistant fastening, crucial for dynamic loads and high-stress environments. Its partially threaded configuration ensures optimal grip and prevents over-tightening, while the hex drive allows for efficient installation with standard tools. Ideal for securing components in equipment where high tensile strength and durability are non-negotiable, this fastener minimizes downtime and maintenance costs.
Specification Summary & Compliance
This screw adheres to Class 3A thread fit for superior dimensional accuracy and meets ASTM A574 specifications for high-strength fasteners. It is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring environmental safety and industrial reliability. The UNC coarse thread and precise manufacturing ensure consistent performance in rigorous applications.
