S-93705A535 1/4"-20 x 3/8" ASME B18.3 18-8 Stainless Steel Thread-Locking Socket Head Screws
18-8 Stainless 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
- Superior corrosion resistance with 18-8 stainless steel construction, ideal for harsh environments and long-term reliability.
- Exceptional mechanical strength offering 70,000 psi tensile strength and Rockwell B70 hardness for heavy-duty applications.
- Vibration-resistant locking via an integrated nylon patch that maintains secure fastening from -70° to 250°F.
- Precise thread engagement with Class 3A fit and UNC coarse threads for quick assembly and reduced cross-threading risk.
- Reliable hex socket drive ensuring high torque transmission and minimal tool slippage during installation.
- Full compliance with ASME B18.3 standards, ensuring dimensional accuracy and interchangeability.
- Environmentally safe design meeting RoHS 3 and REACH regulations for global industrial use.
Professional Applications & Engineering Value
This 1/4"-20 UNC thread socket head cap screw is engineered to address critical challenges in machinery, automotive, and aerospace assemblies where vibration loosening and corrosion are common failures. The 18-8 stainless steel material provides excellent resistance to oxidation and chemicals, extending service life in demanding conditions. Integrated with a nylon patch thread locker, it effectively prevents spontaneous unthreading under dynamic loads, maintaining clamp force integrity across a wide temperature range (-70° to 250°F). The coarse thread design and Class 3A fit facilitate faster installation and higher fatigue resistance, making it a reliable choice for high-stress joints and repetitive disassembly-reassembly cycles in industrial equipment.
Specification Summary & Compliance
This fastener adheres to ASME B18.3 specifications, ensuring precise dimensional control for the socket head, drive, and thread geometry. The UNC coarse thread with Class 3A fit guarantees tight tolerances and consistent performance. It is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, confirming the absence of hazardous substances and supporting sustainable manufacturing practices.
