S-91251A840 4-48 x 5/8" 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 under high-stress conditions, reducing the risk of fastener failure.
- Precise Class 3A thread fit provides superior engagement and vibration resistance in critical assemblies, minimizing loosening over time.
- Black-oxide coating on alloy steel offers enhanced corrosion resistance and a durable, non-reflective finish suitable for harsh environments.
- Fine UNF thread design allows for finer adjustments and improved clamping force in precision engineering applications.
- Hex socket drive (3/32") enables high-torque installation with standard tools, ensuring secure fastening in confined spaces.
- Full threading along the 5/8" length provides consistent holding power and flexibility in various material thicknesses.
- Compliance with ASTM A574, RoHS 3, and REACH guarantees material consistency and environmental safety for global industrial use.
Professional Applications & Engineering Value
Engineered for demanding industrial settings, this black-oxide alloy steel socket head cap screw combines high Rockwell C37 hardness with a 170,000 psi tensile strength to withstand dynamic loads and prevent stripping in machinery, automotive, and aerospace components. The 4-48 UNF fine thread and Class 3A fit ensure tight tolerances, reducing the need for frequent maintenance in vibration-prone systems. Its fully threaded design and hex drive facilitate quick assembly in tight spaces, while the corrosion-resistant finish extends service life in humid or chemically exposed environments, making it ideal for OEM and MRO applications requiring durability and precision.
Specification Summary & Compliance
This socket head cap screw adheres to inch system measurements with a length of 5/8" and thread size of 4-48 UNF (fine), manufactured to Class 3A thread fit for high precision. It meets ASTM A574 specifications for alloy steel socket head cap screws and is compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring environmental safety and material reliability in industrial fastening solutions.
