S-91205A201 8-32 x 1 1/4" 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
- Vibration-resistant locking with permanent nylon patch ensures reliable fastening in high-stress environments, preventing loosening under dynamic loads.
- Exceptional tensile strength of 170,000 psi provides superior load-bearing capacity for demanding industrial applications.
- Corrosion-resistant black-oxide finish on alloy steel enhances durability and extends service life in various operating conditions.
- Wide temperature tolerance from -70° to 250°F maintains performance integrity across extreme thermal cycles.
- Precise Class 3A thread fit with UNC coarse threads ensures easy assembly and secure engagement in tapped holes.
- Partially threaded design allows for controlled clamping force and reduced risk of cross-threading during installation.
- Standard hex socket drive (9/64") enables high-torque application with common tools, minimizing strip-out risks.
Professional Applications & Engineering Value
Engineered for critical industrial fastening, this socket head cap screw combines black-oxide alloy steel with a nylon patch thread locker to solve common vibration-induced failure points in machinery, automotive, and heavy equipment. The 8-32 UNC coarse thread facilitates quick assembly while maintaining Class 3A precision for consistent torque-to-clamp load ratios. Its partially threaded shank concentrates engagement where needed, reducing stress concentration. With a 170,000 psi tensile strength and thermal stability from -70° to 250°F, it delivers reliable performance in environments subject to thermal cycling and dynamic stresses, making it ideal for high-strength fastener applications requiring compliance with ASME B18.3 and ASTM A574 standards.
Specification Summary & Compliance
This screw adheres to Class 3A thread fit tolerances per UNC coarse thread standards, ensuring dimensional accuracy for secure fastening. Manufacturing complies with ASME B18.3 and material specifications under ASTM A574, guaranteeing consistency and reliability. The product is fully RoHS 3 (2015/863/EU) Compliant and REACH (EC 1907/2006) Compliant, meeting environmental and safety regulations for global industrial use.
