S-91205A593 5/16"-18 x 2 1/2" ASME B18.3, ASTM A574 Alloy Steel Thread-Locking Socket Head Screws
Alloy Steel Thread-Locking 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
- Superior vibration resistance with integrated nylon patch thread locker that maintains secure fastening from -70° to 250°F
- Exceptional tensile strength of 170,000 psi ensures reliable performance in high-stress applications
- Precise Class 3A thread fit provides superior engagement and consistent clamping force
- Black-oxide surface treatment on alloy steel offers enhanced corrosion resistance for extended service life
- Hex socket drive design allows for high-torque installation in confined spaces
- Partially threaded configuration enables optimal grip length control for specific assembly requirements
- Industry-standard compliance with ASME B18.3 and material specifications ensures consistent quality and interchangeability
Professional Applications & Engineering Value
These black-oxide alloy steel socket head cap screws deliver critical performance advantages in demanding industrial environments where vibration resistance and high tensile strength are paramount. The UNC coarse thread profile with Class 3A precision fit ensures rapid assembly and reliable engagement in various materials, while the integrated nylon patch thread locker effectively prevents loosening under dynamic loads. The partially threaded design provides optimal stress distribution, making these fasteners ideal for machinery, automotive assemblies, and heavy equipment where vibration-resistant fastening solutions are essential. The combination of Rockwell C37 hardness and controlled thread length delivers exceptional durability in high-cycle applications.
Specification Summary & Compliance
This 5/16"-18 UNC thread socket head cap screw features Class 3A thread fit for precision engagement and coarse thread spacing for efficient installation. Manufactured to ASME B18.3 specifications using ASTM A574 alloy steel, the fastener delivers consistent dimensional accuracy and mechanical properties. Compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations, ensuring suitability for global industrial applications requiring restricted substance compliance.
