S-91205A538 1/4"-20 x 9/16" 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 the integrated Nylon Patch thread locker, ensuring secure fastening in high-vibration environments without loosening.
- Exceptional tensile strength of 170,000 psi, providing reliable performance under heavy loads and stress in demanding industrial applications.
- Corrosion-resistant black-oxide finish on alloy steel, enhancing durability and longevity in various operating conditions.
- Precise Class 3A thread fit for superior engagement and reduced risk of cross-threading, ensuring smooth installation and consistent clamping force.
- Wide temperature tolerance from -70° to 250°F, maintaining locking integrity and mechanical properties in extreme thermal environments.
- High hardness (Rockwell C37) for excellent wear resistance, reducing thread deformation and extending service life.
- Hex socket drive design allowing for high torque application and easy installation in confined spaces with standard tools.
Professional Applications & Engineering Value
This Socket Head Cap Screw is engineered to address critical challenges in machinery assembly, automotive, and heavy equipment industries. The Black-Oxide Alloy Steel construction combined with a Nylon Patch thread locker provides reliable vibration resistance, preventing fastener failure in dynamic loads. The UNC coarse thread and Class 3A fit ensure quick assembly and high clamping force, reducing installation time while maintaining precision. Ideal for applications requiring secure fastening under thermal cycling, such as engine components or industrial actuators, this screw delivers consistent performance where loosening could lead to operational downtime or safety risks.
Specification Summary & Compliance
This screw features a 1/4"-20 UNC thread with Class 3A dimensional accuracy and coarse spacing for robust engagement. It is manufactured in compliance with ASME B18.3 and ASTM A574 specifications, ensuring consistent quality and mechanical properties. The product is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations, supporting sustainable and safe usage in global markets.
