S-91251A231 4-40 x 3/32" 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 provides reliable performance under high-stress conditions, reducing the risk of fastener failure.
- Precise Class 3A thread fit ensures tight, secure connections with minimal backlash, ideal for applications requiring exact alignment.
- Black-oxide coating on alloy steel enhances corrosion resistance and offers a durable, low-glare finish suitable for harsh environments.
- Hex socket drive design allows for easy installation and removal with standard tools, minimizing assembly time and tool slippage.
- Coarse UNC threading facilitates quick engagement and disassembly, improving efficiency in maintenance and production lines.
- Full threading along the 3/32" length provides consistent grip and load distribution, enhancing joint integrity in compact spaces.
- Compliance with ASTM A574, RoHS 3, and REACH guarantees material quality and environmental safety, meeting global industrial standards.
Professional Applications & Engineering Value
This 4-40 UNC Socket Head Cap Screw is engineered to address critical challenges in precision assembly and high-vibration environments. The black-oxide alloy steel construction, combined with a Rockwell C37 hardness, resists wear and corrosion, extending service life in machinery, automotive, and electronics sectors. Its coarse thread and Class 3A fit ensure rapid, secure fastening, reducing installation errors and downtime. Ideal for industrial applications like CNC equipment and enclosures, it maintains integrity under dynamic loads, while the hex drive simplifies access in confined spaces, boosting productivity and reliability.
Specification Summary & Compliance
This screw adheres to Class 3A thread fit for precise UNC coarse threading, with dimensions including a 3/32" length and 0.112" thread diameter. Manufactured to ASTM A574 specifications, it ensures consistent quality and performance. Compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006), it meets environmental and safety standards for global industrial use.
