S-90128A572 1/4"-20 x 5" 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.
- Partially threaded design allows for controlled clamping force, ideal for applications requiring specific grip range and alignment.
- Hex socket drive enables high-torque installation with standard tools, facilitating efficient assembly in confined spaces.
- Compliance with ASTM A574, RoHS 3, and REACH ensures material consistency and environmental safety for global supply chain integration.
Professional Applications & Engineering Value
Engineered for demanding environments, these zinc-plated alloy steel socket head cap screws deliver critical reliability in machinery, automotive, and construction sectors where high tensile strength and corrosion resistance are paramount. The UNC coarse thread with Class 3A fit ensures rapid assembly and vibration resistance, reducing maintenance downtime in dynamic load conditions. With a partially threaded shank, they provide optimal stress distribution, preventing joint failure in structural applications. The hex drive design allows for secure tool engagement, making them ideal for high-torque fastening in compact assemblies, while the zinc plating extends longevity in outdoor or chemically exposed settings, supporting long-term operational efficiency.
Specification Summary & Compliance
This socket head cap screw features a 1/4"-20 UNC coarse thread with Class 3A thread fit for precision alignment, a minimum thread length of 1 inch, and a tensile strength of 170,000 psi. Manufactured in compliance with ASTM A574 specifications, it meets RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental standards, ensuring material safety and regulatory adherence for industrial use.
