S-91251A488 5/8"-18 x 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
- Superior tensile strength of 170,000 PSI ensures reliable performance under extreme loads and vibrations in demanding industrial environments.
- Precise Class 3A thread fit provides excellent engagement and resistance to loosening, enhancing assembly integrity and reducing maintenance needs.
- Black-oxide finish on alloy steel offers enhanced corrosion resistance, prolonging service life in harsh operating conditions.
- Fine thread spacing (UNRF) delivers improved clamping force and better load distribution compared to coarse threads.
- Partially threaded design allows for secure fastening in specific zones, minimizing stress concentration and simplifying installation.
- High hardness (Rockwell C37) ensures exceptional wear resistance and durability, reducing the risk of stripping or deformation during use.
- Compliance with ASTM A574 guarantees consistent quality and performance, meeting rigorous industry standards for socket head cap screws.
Professional Applications & Engineering Value
This 5/8"-18 UNRF socket head cap screw is engineered to address critical challenges in heavy-duty machinery, automotive assemblies, and structural frameworks where high tensile strength and vibration resistance are paramount. The black-oxide alloy steel construction combats rust and wear, while the fine thread spacing ensures superior grip in materials prone to fatigue. Its partially threaded rod design focuses stress away from the head, preventing failure points in dynamic applications. Ideal for industrial fasteners requiring precise torque and long-term reliability, this screw minimizes downtime and maintenance costs in demanding engineering environments.
Specification Summary & Compliance
This product adheres to Class 3A thread fit for tight tolerances and optimal performance. It conforms to ASTM A574 specifications for socket head cap screws and is compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring environmental safety and material integrity. The UNRF fine thread and precise dimensions support consistent assembly across various industrial applications.
