S-91205A063 2-56 x 3/8" 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
- Permanent vibration resistance with nylon patch locking, ensuring secure fastening in high-stress environments
- Exceptional tensile strength of 170,000 psi for reliable performance under heavy loads and mechanical stress
- Corrosion-resistant black-oxide finish on alloy steel, enhancing durability in harsh industrial conditions
- Precise Class 3A thread fit for smooth assembly and reduced risk of cross-threading in UNC coarse thread applications
- Wide temperature tolerance from -70° to 250°F, maintaining locking integrity across diverse operating environments
- Standard hex socket drive (5/64") for easy installation with common tools, minimizing assembly time
- Full compliance with ASME B18.3 and international regulations, ensuring quality and safety for global supply chains
Professional Applications & Engineering Value
Engineered for demanding industrial applications, this socket head cap screw combines black-oxide alloy steel construction with a permanent nylon patch locking mechanism to solve critical vibration-induced loosening issues in machinery, automotive assemblies, and precision equipment. The UNC coarse threads with Class 3A fit provide rapid installation and high clamp force retention, while the 170,000 psi tensile strength ensures structural integrity under dynamic loads. Ideal for tight-clearance applications requiring reliable, reusable locking fasteners that withstand thermal cycling from -70° to 250°F without compromising performance.
Specification Summary & Compliance
This fastener meets ASME B18.3 dimensional specifications with UNC 2-56 threads and Class 3A thread fit for precision tolerance. Manufactured per ASTM A574 standards, it is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring environmental safety and material traceability. The fully threaded design and right-hand thread direction support standardized assembly processes across global industrial sectors.
