S-90344A131 4-40 x 1/2" ASTM A574 Socket Head Screws with Flat Washer
Socket Head Screws with Flat Washer
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Basic Information
Head Parameters
Dimensions
Thread Parameters
Tip & Drive Parameters
Washer & Nut
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 in demanding applications.
- Superior corrosion resistance from the black-oxide finish on alloy steel, prolonging service life in harsh industrial environments.
- Precise Class 3A thread fit provides tighter tolerances for secure, vibration-resistant assemblies, minimizing loosening over time.
- Integrated flat washer distributes load evenly, preventing surface damage and enhancing joint integrity without separate components.
- Hex socket drive design allows for high-torque installation with standard 3/32" tools, facilitating efficient assembly in confined spaces.
- Fully threaded coarse UNC design enables quick engagement and strong holding power across the entire 1/2" length for versatile mounting.
- High hardness (Rockwell C39) resists wear and deformation, ensuring long-term durability in repetitive or high-load scenarios.
Professional Applications & Engineering Value
Engineered for precision and endurance, this 4-40 UNC socket head cap screw combines black-oxide alloy steel with a Class 3A thread fit to address common industrial challenges like vibration-induced loosening and corrosion. The fully threaded coarse thread design ensures rapid installation and robust clamping force in machinery, automotive, and electronics assemblies, while the integrated flat washer eliminates the need for additional parts, streamlining inventory and reducing assembly errors. Ideal for applications requiring high tensile strength and compliance with stringent standards, it delivers consistent performance in tight-clearance environments where reliability is critical.
Specification Summary & Compliance
This screw adheres to UNC coarse thread standards with a precise Class 3A thread fit for dimensional accuracy. Manufactured in accordance with ASTM A574 specifications, it meets RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) compliance for environmental safety, ensuring suitability in regulated industrial sectors.
