S-91251A188 8-32 x 1 7/8" 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.
- Superior corrosion resistance provided by the Black-Oxide finish on Alloy Steel, extending service life in demanding industrial environments.
- Precise Class 3A thread fit guarantees secure, vibration-resistant connections, minimizing loosening in critical assemblies.
- Partially threaded design allows for optimal clamping force control, ideal for applications requiring specific grip lengths.
- High hardness (Rockwell C37) enhances wear resistance, maintaining thread integrity through repeated installations.
- Standard hex socket drive (9/64") enables easy installation with common tools, reducing assembly time and effort.
- Compliance with ASTM A574 ensures consistent quality and mechanical properties, meeting rigorous industry standards.
Professional Applications & Engineering Value
These 8-32 UNC thread socket head cap screws are engineered to address common industrial challenges, such as vibration-induced loosening and corrosion in harsh environments. The Black-Oxide Alloy Steel construction provides a durable barrier against moisture and chemicals, while the coarse thread design facilitates quick assembly in materials like cast iron or soft metals. The partially threaded configuration offers precise clamping in machinery, automotive, and aerospace applications, ensuring stable joints without over-tightening. With a right-hand thread and hex drive, they simplify maintenance and reduce downtime, making them a reliable choice for high-performance industrial fasteners.
Specification Summary & Compliance
This product adheres to Class 3A thread fit for tight tolerances and UNC coarse thread standards, ensuring compatibility with common components. It meets ASTM A574 specifications for material and mechanical properties, and is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, supporting environmentally responsible sourcing and usage in global markets.
