S-90128A242 1/4"-20 x 1/2" 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 applications, reducing the risk of fastener failure.
- Class 3A thread fit provides tighter tolerances for superior fastening precision and vibration resistance in demanding environments.
- Zinc-plated alloy steel construction offers excellent corrosion resistance, extending service life and reducing maintenance needs.
- Rockwell C37 hardness enhances durability and wear resistance, ideal for repetitive assembly and disassembly cycles.
- UNC coarse threading allows for quicker installation and reduced cross-threading risks, improving assembly efficiency.
- Hex socket drive (3/16") enables high-torque application with standard tools, ensuring secure fastening in confined spaces.
- Full threading along the 1/2" length provides consistent grip and clamping force across the entire engaged area.
Professional Applications & Engineering Value
This zinc-plated alloy steel socket head cap screw is engineered to address critical industrial fastening challenges where high tensile strength and precision threading are paramount. The UNC coarse thread design facilitates rapid assembly in machinery, automotive, and heavy equipment applications, minimizing installation time while maintaining Class 3A fit accuracy. The zinc plating provides a protective barrier against corrosion, making it suitable for environments exposed to moisture or chemicals. Its socket head design allows for high torque application with common hex keys, ensuring secure fastening in space-constrained assemblies. These features collectively enhance operational reliability, reduce downtime, and support long-term structural integrity in industrial fastening systems.
Specification Summary & Compliance
This socket head cap screw adheres to Class 3A thread fit tolerances for precise engagement, with UNC coarse threading (1/4"-20) and right-hand direction. It is manufactured in compliance with ASTM A574 specification for high-strength alloy steel fasteners. The product meets RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental standards, ensuring regulatory compliance for hazardous substance restrictions.
