S-90128A554 1/4"-20 x 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 corrosion resistance with zinc-plated alloy steel construction for prolonged service life in harsh environments
- Superior load-bearing capability with 170,000 psi tensile strength and Rockwell C37 hardness for high-stress applications
- Precise thread engagement through Class 3A thread fit ensuring reliable fastening and vibration resistance
- Optimized installation efficiency with UNC coarse threading enabling quick assembly and reduced cross-threading risks
- Secure hex drive compatibility using standard 3/16" drive tools for consistent torque application and slip-resistant operation
- Regulatory compliance assurance meeting ASTM A574, RoHS 3, and REACH standards for global industrial use
- Versatile partial threading design allowing both threaded and unthreaded sections for flexible component mounting
Professional Applications & Engineering Value
Engineered for demanding industrial assemblies, these zinc-plated alloy steel socket head cap screws deliver critical corrosion protection where moisture or chemicals are present. The 1/4"-20 UNC coarse thread configuration provides rapid installation in machinery, automotive subsystems, and structural frameworks, while the Class 3A thread fit maintains clamping force under dynamic loads. The hex drive socket head design permits high-torque tightening in confined spaces, making these partially threaded screws ideal for precision equipment requiring both alignment stability and adjustable tensioning. With 170,000 psi tensile strength, they prevent joint failure in heavy-duty applications, from conveyor systems to industrial robotics.
Specification Summary & Compliance
Manufactured to ASTM A574 specifications with Class 3A thread tolerances for consistent dimensional accuracy. Features UNC coarse threads in right-hand direction with 1" minimum thread length on a 3" partially threaded shank. Complies with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations, ensuring safe usage in international markets. All measurements conform to inch system standards with defined head diameter (3/8") and drive size (3/16") specifications.
