S-90128A259 1/4"-20 x 2 3/4" 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
- Superior corrosion resistance with zinc plating that protects against rust in demanding industrial environments
- Exceptional tensile strength of 170,000 psi ensures reliable performance under heavy loads and vibration
- Precision Class 3A thread fit provides secure fastening with minimal play in critical applications
- Hex socket drive design allows for high-torque installation in confined spaces without slippage
- Rockwell C37 hardness rating maintains thread integrity and prevents stripping during repeated use
- ASTM A574 compliance guarantees consistent quality and mechanical properties for engineering applications
- Environmental regulation compliance with RoHS 3 and REACH ensures safe use across global markets
Professional Applications & Engineering Value
Engineered for heavy-duty industrial applications, these socket head cap screws combine zinc-plated alloy steel construction with UNC coarse threading to deliver superior vibration resistance in machinery, automotive assemblies, and structural frameworks. The partially threaded design concentrates strength where needed most while the hex drive system enables precise torque application in space-constrained environments. With 170,000 psi tensile strength and Rockwell C37 hardness, these fasteners prevent joint failure in high-stress applications while the corrosion-resistant plating extends service life in harsh operating conditions. Ideal for precision equipment manufacturing, industrial automation systems, and critical infrastructure projects requiring reliable Class 3A thread fit performance.
Specification Summary & Compliance
Manufactured to ASTM A574 specifications with Class 3A thread fit tolerance for precision assembly. Features 1/4"-20 UNC coarse threads with partial threading configuration and 3/16" hex drive compatibility. Fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations for global market acceptance.
