S-91205A124 5-40 x 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
- Exceptional tensile strength of 170,000 psi ensures reliable performance in high-stress applications, reducing the risk of fastener failure.
- Nylon patch thread locker provides vibration resistance and maintains secure fastening across a wide temperature range from -70° to 250°F.
- Class 3A thread fit offers precise, tight tolerances for superior engagement and reduced loosening in critical assemblies.
- Black-oxide coating on alloy steel enhances corrosion resistance and durability, extending service life in demanding environments.
- Hex socket drive design allows for high torque application and easy installation in confined spaces with standard tools.
- Full threading ensures consistent clamping force along the entire length, ideal for varied material thicknesses.
- Compliance with ASME B18.3 and ASTM A574 guarantees consistent quality and interchangeability in industrial applications.
Professional Applications & Engineering Value
This 5-40 UNC socket head cap screw is engineered to address common industrial challenges such as vibration-induced loosening and material fatigue. The black-oxide alloy steel construction, combined with a Rockwell C37 hardness, provides excellent wear resistance and strength for heavy-duty machinery, automotive assemblies, and precision equipment. The coarse UNC thread and Class 3A fit ensure quick installation and reliable performance in high-vibration environments, while the nylon patch thread locker secures fasteners without the need for additional adhesives. Ideal for applications requiring repeated disassembly and reassembly, this screw offers long-term reliability and reduces maintenance downtime.
Specification Summary & Compliance
This screw features a 5-40 UNC thread with Class 3A precision fit, ensuring tight tolerances and consistent performance. It is manufactured in accordance with ASME B18.3 and ASTM A574 specifications, guaranteeing dimensional accuracy and material integrity. The product is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, making it suitable for use in environmentally sensitive and regulated industries.
