S-90128A319 1/4"-20 x 1 5/8" ASME B18.3, 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 the alloy steel from rust and environmental degradation, extending service life.
- Precise Class 3A thread fit provides tighter tolerances for secure, vibration-resistant assemblies in critical machinery.
- Partially threaded design allows for controlled clamping force and easier alignment in complex assemblies.
- High hardness (Rockwell C37) offers excellent wear resistance, maintaining thread integrity through repeated use.
- Hex socket drive (3/16") enables high-torque installation with standard tools, minimizing stripping and improving efficiency.
- Compliance with ASME B18.3 and ASTM A574 guarantees consistent quality and interchangeability in industrial settings.
Professional Applications & Engineering Value
This 1/4"-20 UNC Socket Head Cap Screw is engineered for demanding industrial environments where reliability is non-negotiable. The zinc-plated alloy steel construction combats corrosion in harsh conditions, while the coarse UNC thread and Class 3A fit ensure rapid assembly with minimal cross-threading risks. Its partially threaded shank concentrates clamping force precisely, preventing joint loosening under vibration—common in machinery, automotive, and heavy equipment. With a 170,000 psi tensile strength and Rockwell C37 hardness, it withstands extreme loads without deformation, making it ideal for high-stress fastening in aerospace, manufacturing, and construction applications where durability and compliance are critical.
Specification Summary & Compliance
This screw adheres to Class 3A thread fit for superior precision and meets ASME B18.3 and ASTM A574 manufacturing standards. It is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring environmental safety and material integrity. Specifications include a 1/4"-20 UNC coarse thread, 1 5/8" length, and partially threaded rod type for controlled application performance.
