S-91251A086 8-32 x 3" 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.
- Superior corrosion resistance from the black-oxide finish extends service life in harsh industrial environments, minimizing maintenance needs.
- Precise Class 3A thread fit provides tight tolerances for secure, vibration-resistant connections in critical assemblies.
- High hardness rating (Rockwell C37) enhances wear resistance, maintaining thread integrity through repeated use.
- Partially threaded design allows for controlled clamping force and easier alignment in complex machinery setups.
- Coarse UNC threading enables quick installation and reduced cross-threading risks, boosting assembly efficiency.
- Compliance with ASTM A574, RoHS 3, and REACH ensures material consistency and environmental safety for global supply chain integration.
Professional Applications & Engineering Value
Engineered for demanding industrial applications, these black-oxide alloy steel socket head cap screws combine high tensile strength and corrosion resistance to address common challenges like vibration loosening and environmental degradation. The 8-32 UNC coarse threads with a Class 3A fit provide secure fastening in equipment subjected to dynamic loads, while the hex drive design allows for high-torque installation in confined spaces. Ideal for machinery, automotive, and aerospace assemblies, these screws deliver long-term reliability by maintaining clamp load under extreme conditions, reducing downtime and replacement costs. The partially threaded shank further enhances stability in precision components, making them a trusted choice for engineers seeking durable, compliant fastening solutions.
Specification Summary & Compliance
This product adheres to Class 3A thread fit per UNC standards, ensuring precise dimensional accuracy for secure engagements. Manufacturing follows ASTM A574 specifications for consistent material properties, with full compliance to RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, confirming the absence of restricted substances for safe use in regulated industries.
