S-90128A251 1/4"-20 x 1 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.
- Superior corrosion resistance from zinc plating protects against rust and extends service life in harsh industrial environments.
- Precise Class 3A thread fit provides tighter tolerances for secure, vibration-resistant connections in critical assemblies.
- Hex socket drive design allows for high torque application and easy installation in confined spaces with standard tools.
- Partially threaded shank offers optimal grip and clamping force, ideal for materials requiring controlled tension.
- Rockwell C37 hardness maintains structural integrity under heavy loads, ensuring long-term durability.
- Compliance with ASTM A574, RoHS 3, and REACH guarantees material quality and environmental safety for global supply chain requirements.
Professional Applications & Engineering Value
Engineered for demanding industrial applications, these zinc-plated alloy steel socket head cap screws deliver reliable fastening in machinery, automotive, and heavy equipment. The 1/4"-20 UNC coarse thread and Class 3A fit provide excellent resistance to loosening under vibration, a common challenge in dynamic environments. With a 170,000 psi tensile strength and Rockwell C37 hardness, they withstand extreme mechanical stresses without deformation. The hex drive and partially threaded design enable precise installation in tight spaces, reducing assembly time and improving maintenance efficiency. Ideal for high-strength cap screw needs where durability and regulatory compliance are critical.
Specification Summary & Compliance
This screw features a 1/4"-20 UNC thread with Class 3A fit and coarse spacing, ensuring precise engagement. Dimensions include a 1 1/2" length, 3/16" hex drive, and 3/8" head diameter. Manufactured to ASTM A574 specifications for consistent quality, it is RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) compliant, meeting international environmental and safety standards.
