S-91251A638 3/8"-16 x 3 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 ensures reliable performance in high-stress industrial applications, reducing the risk of fastener failure.
- Class 3A thread fit provides precise, tight tolerances for secure fastening and vibration resistance in demanding environments.
- Black-oxide coating on alloy steel offers enhanced corrosion resistance, extending the screw's service life in various operating conditions.
- Coarse UNC threads enable quick and easy installation, saving time during assembly while maintaining strong holding power.
- Partially threaded design with 1-1/4" minimum thread length allows for optimal grip and alignment in components, improving joint integrity.
- Hex socket drive facilitates easy access and high torque application in confined spaces, minimizing tool slippage and damage.
- Compliance with ASTM A574, RoHS 3, and REACH ensures adherence to industry standards and environmental regulations, supporting sustainable and safe usage.
Professional Applications & Engineering Value
These socket head cap screws are engineered from black-oxide alloy steel to address common industrial challenges, such as vibration loosening and corrosion in harsh environments. The UNC coarse threads and Class 3A thread fit provide superior clamping force and resistance to dynamic loads, making them ideal for machinery, automotive, and heavy equipment applications. With a Rockwell C37 hardness and high tensile strength, they withstand extreme pressures without deforming, ensuring long-term reliability. The partially threaded design allows for precise engagement in assemblies, reducing stress concentrations and enhancing overall structural integrity in industrial fastening systems.
Specification Summary & Compliance
This product features precise Class 3A thread fit with UNC coarse threads and a minimum thread length of 1-1/4". It conforms to ASTM A574 specifications for high-strength socket head cap screws, ensuring consistent quality and performance. Additionally, it is RoHS 3 (2015/863/EU) Compliant and REACH (EC 1907/2006) Compliant, meeting environmental and safety standards for industrial use.
