S-90128A113 4-40 x 3/4" 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 in high-stress industrial applications, reducing the risk of fastener failure.
- Superior corrosion resistance from zinc plating protects against rust and environmental damage, extending service life in harsh conditions.
- Precise Class 3A thread fit provides tighter tolerances for secure, vibration-resistant assemblies, minimizing loosening over time.
- High hardness (Rockwell C37) offers excellent wear resistance, maintaining thread integrity during repeated installation and removal.
- Fully threaded design allows for consistent clamping force along the entire length, ideal for adjustable or deep-set applications.
- Coarse UNC threads enable quicker installation and are less prone to clogging in dirty or debris-filled environments.
- Hex socket drive with 3/32" size facilitates easy installation in confined spaces using standard tools, improving assembly efficiency.
Professional Applications & Engineering Value
This 4-40 UNC Socket Head Cap Screw is engineered to address critical challenges in industrial settings, such as vibration-induced loosening and corrosion degradation. The zinc-plated alloy steel construction provides a durable barrier against moisture and chemicals, making it suitable for machinery, automotive, and outdoor equipment where corrosion resistance is paramount. Its fully threaded and coarse thread design ensures rapid assembly and reliable grip in materials prone to stripping, while the high tensile strength and Rockwell C37 hardness prevent deformation under heavy loads. Ideal for precision applications requiring Class 3A thread fit, this fastener delivers consistent performance in demanding environments, reducing maintenance needs and enhancing operational reliability.
Specification Summary & Compliance
This screw adheres to ASTM A574 specifications, ensuring consistent quality and performance. It features a Class 3A thread fit for precise tolerances and UNC coarse threads with a size of 4-40. The product is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, confirming it is free from hazardous substances and safe for various industrial uses.
