S-91251A476 3/8"-24 x 5 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 applications, reducing the risk of fastener failure.
- Superior corrosion resistance from the black-oxide finish on alloy steel, extending service life in demanding industrial environments.
- Precise Class 3A thread fit provides tighter tolerances for secure, vibration-resistant connections in critical assemblies.
- Fine UNF thread design offers improved load distribution and better retention compared to coarse threads.
- Hex socket drive allows for high-torque installation with standard tools, minimizing stripping and improving assembly efficiency.
- Rockwell C37 hardness delivers excellent wear resistance, maintaining thread integrity through repeated use.
- Partially threaded shank enables precise clamping force control where full thread engagement isn't required.
Professional Applications & Engineering Value
These socket head cap screws with black-oxide alloy steel construction are engineered to solve critical fastening challenges in heavy machinery, automotive systems, and precision equipment. The UNF fine thread configuration provides superior resistance to loosening under vibration, while the Class 3A thread fit ensures consistent clamping force in high-precision applications. The combination of 170,000 PSI tensile strength and Rockwell C37 hardness makes these fasteners ideal for structural components subjected to dynamic loads, preventing premature failure and reducing maintenance downtime. The black-oxide surface treatment offers additional protection against corrosion in industrial environments where exposure to moisture and chemicals is common.
Specification Summary & Compliance
This 3/8"-24 UNF socket head cap screw features precise Class 3A thread tolerances for superior fit and 5/16" hex drive compatibility. Manufactured to ASTM A574 specification for alloy steel socket head cap screws, ensuring consistent quality and performance. Fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations, making them suitable for global industrial applications with strict material restrictions.
