S-91251A496 5/8"-18 x 1 1/4" ASTM A574 Alloy Steel Socket Head Screws
Alloy Steel 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.
- Superior corrosion resistance from the black-oxide finish on alloy steel extends service life in demanding industrial environments.
- Precise Class 3A fine thread fit provides secure, vibration-resistant connections for critical assemblies.
- High hardness rating (Rockwell C37) offers excellent wear resistance, maintaining thread integrity through repeated use.
- 1/2" hex drive design allows for high-torque installation with standard tools, speeding up assembly processes.
- Full threading along the 1-1/4" length enables adjustable positioning and uniform clamping force distribution.
- Compliance with RoHS 3 and REACH regulations ensures environmental safety and global market acceptance.
Professional Applications & Engineering Value
This 5/8"-18 UNF socket head cap screw is engineered to address common industrial challenges such as joint loosening under dynamic loads and corrosion in harsh conditions. The black-oxide alloy steel construction combined with fine thread spacing and Class 3A thread fit delivers superior vibration resistance and clamping force retention, making it ideal for heavy machinery, automotive systems, and precision equipment. Its fully threaded design allows for versatile adjustment in assemblies requiring consistent tension, while the high tensile strength and hardness prevent stripping and deformation. By meeting ASTM A574 specifications, it guarantees reliability in critical applications where fastener integrity is non-negotiable.
Specification Summary & Compliance
This socket head cap screw features a 5/8"-18 UNF thread with Class 3A precision tolerance for tight fit and fine thread spacing. It is manufactured in accordance with ASTM A574 standards, ensuring consistent quality and performance. The product is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, confirming its adherence to environmental and safety requirements for industrial use.
