S-91251A463 1/4"-28 x 2 1/2" 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 corrosion resistance with black-oxide coating, extending service life in harsh industrial environments.
- Exceptional tensile strength of 170,000 psi ensures reliable performance under high-stress applications without failure.
- Precise Class 3A thread fit guarantees secure, vibration-resistant connections for critical assemblies.
- Fine UNRF threads provide improved load distribution and reduced risk of loosening in dynamic conditions.
- Partially threaded design allows for controlled clamping force and easier alignment in precision machinery.
- Hex socket drive enables high-torque installation with standard tools, minimizing slip and damage risks.
- Rockwell C37 hardness offers excellent wear resistance, maintaining thread integrity through repeated use.
Professional Applications & Engineering Value
Engineered for demanding industrial settings, this black-oxide alloy steel socket head cap screw addresses common challenges like vibration-induced loosening and environmental degradation. The fine UNRF thread and Class 3A fit ensure tight, reliable fastening in machinery, automotive, and aerospace components where precision is critical. Its partially threaded shank concentrates stress away from the head, reducing the risk of fatigue failure. With a 170,000 psi tensile strength and corrosion-resistant coating, it outperforms standard fasteners in high-load applications, providing long-term durability and reducing maintenance downtime. Ideal for industrial fasteners requiring consistent performance under extreme conditions.
Specification Summary & Compliance
This screw features a 1/4"-28 fine thread with Class 3A thread fit for high precision, manufactured to ASTM A574 specifications. It complies with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring environmental safety and material reliability. Dimensions include a 2-1/2" length with a 3/16" hex drive, adhering to inch system standards for consistent integration in global industrial applications.
