S-90128A105 4-40 x 3/16" 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.
- Zinc-plated alloy steel construction provides excellent corrosion resistance, extending service life in demanding industrial environments.
- Class 3A thread fit offers superior precision and tighter tolerances for secure, vibration-resistant assemblies.
- Hex socket drive design allows for high-torque installation and easy access in confined spaces, improving assembly efficiency.
- Rockwell C37 hardness delivers enhanced durability and wear resistance, maintaining thread integrity through repeated use.
- Coarse UNC threading enables quick installation and better performance in materials prone to stripping or cross-threading.
- Full compliance with ASTM A574, RoHS 3, and REACH ensures material consistency, environmental safety, and global regulatory acceptance.
Professional Applications & Engineering Value
This 4-40 UNC thread Socket Head Cap Screw is engineered to address critical fastening challenges in precision machinery, automotive assemblies, and heavy-duty equipment. The zinc-plated alloy steel material combats rust and corrosion, making it ideal for humid or outdoor settings. Its high tensile strength and Rockwell C37 hardness prevent stripping and deformation under dynamic loads, while the hex drive socket head facilitates secure tightening in space-constrained applications. These features collectively reduce maintenance frequency, enhance operational safety, and support long-term reliability in industrial fastening solutions where consistent performance is non-negotiable.
Specification Summary & Compliance
This screw adheres to Class 3A thread fit for precise engagement and features a coarse UNC thread with right-hand direction. Dimensions include a 3/16" length and 3/32" hex drive size. It conforms to ASTM A574 specifications for high-strength alloy steel socket head cap screws and is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations, ensuring safe and sustainable usage.
