S-91205A191 8-32 x 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
- Exceptional tensile strength of 170,000 psi ensures reliable performance in demanding applications, reducing the risk of fastener failure.
- Nylon patch thread locker provides vibration-resistant locking, maintaining clamp load integrity from -70° to 250°F without requiring separate adhesives.
- Black-oxide finish on alloy steel offers corrosion resistance and a durable, non-galling surface for extended service life.
- Class 3A thread fit delivers precise, tighter tolerances for superior engagement and load distribution in critical assemblies.
- Hex socket drive design allows high torque application and easy installation in confined spaces, minimizing tool slippage.
- Coarse UNC threads enable quick assembly and disassembly, reducing installation time in industrial maintenance and production.
- Full compliance with ASME B18.3 ensures dimensional consistency and interchangeability, streamlining procurement and inventory management.
Professional Applications & Engineering Value
Engineered for heavy-duty industrial applications, this black-oxide alloy steel socket head cap screw addresses common challenges like vibration loosening and corrosion in machinery, automotive, and equipment manufacturing. The 8-32 UNC coarse thread with Class 3A fit provides reliable fastening in materials where fine threads may strip, while the nylon patch thread locker secures joints without compromising reusability. Its Rockwell C37 hardness and high tensile strength ensure durability under dynamic loads, making it ideal for assembly lines, structural frames, and precision instruments requiring consistent clamp force and long-term reliability.
Specification Summary & Compliance
This socket head cap screw features a 1/4" length with 8-32 UNC coarse threads and Class 3A thread fit for precise dimensional accuracy. Manufactured in accordance with ASME B18.3 specifications and ASTM A574 material standards, it ensures consistent performance. The product is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, supporting environmentally responsible sourcing and use in global markets.
