S-90117A585 5/16"-18 x 1 1/4" ASME B18.3 Alloy Steel Wire-Lockable Socket Head Screws
Alloy Steel Wire-Lockable 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 under high-stress conditions, reducing the risk of fastener failure.
- Superior corrosion resistance from the black-oxide finish on alloy steel, extending service life in harsh industrial environments.
- Precise Class 3A thread fit provides tighter tolerances for secure, vibration-resistant assemblies in critical applications.
- High hardness rating (Rockwell C37) enhances wear resistance, maintaining thread integrity through repeated use.
- Coarse UNC threading allows for quicker installation and reduced cross-threading risks, improving assembly efficiency.
- Full-threaded design ensures consistent clamping force along the entire length, ideal for adjustable or deep-set applications.
- Standard hex drive compatibility with 1/4" drive size enables easy installation using common tools, minimizing downtime.
Professional Applications & Engineering Value
This black-oxide alloy steel socket head cap screw is engineered to address common industrial challenges such as vibration loosening, corrosion-induced degradation, and high-load demands. The 5/16"-18 UNC coarse threads with Class 3A fit provide superior grip in materials like steel and aluminum, making them ideal for machinery, automotive assemblies, and heavy equipment where precision and durability are critical. The fully threaded design ensures uniform stress distribution, while the corrosion-resistant black-oxide coating protects against moisture and chemicals, reducing maintenance needs in demanding environments like manufacturing plants or outdoor installations.
Specification Summary & Compliance
This fastener adheres to ASME B18.3 specifications, ensuring dimensional accuracy and interchangeability. Threads conform to UNC coarse thread standards with a Class 3A fit for precise engagement. The product is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, guaranteeing environmental safety and material restrictions adherence for global industrial use.
