S-91251A650 3/8"-16 x 4 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
- Exceptional tensile strength of 170,000 psi ensures reliable performance in high-stress industrial applications.
- Superior corrosion resistance with black-oxide coating prolongs service life in demanding environments.
- Precision Class 3A thread fit guarantees secure, vibration-resistant connections with minimal backlash.
- Hex socket drive design allows for high-torque installation in confined spaces with standard tools.
- Partially threaded shank provides optimal grip length while preventing thread damage during assembly.
- Coarse UNC threading enables rapid installation and superior resistance to loosening under dynamic loads.
- Rockwell C37 hardness maintains structural integrity under repeated loading and extreme conditions.
Professional Applications & Engineering Value
Engineered for heavy-duty industrial applications, these black-oxide alloy steel socket head cap screws solve critical fastening challenges in machinery, automotive, and construction sectors. The 3/8"-16 UNC coarse thread configuration combined with Class 3A precision threads ensures rapid assembly while maintaining vibration resistance in high-cycle operations. The partially threaded design concentrates clamping force precisely where needed, preventing joint failure in structural components. With 170,000 psi tensile strength and corrosion-resistant black-oxide surface treatment, these fasteners deliver long-term reliability in harsh operating conditions where standard fasteners would fail prematurely.
Specification Summary & Compliance
Manufactured to ASTM A574 specifications with Class 3A thread fit ensuring superior dimensional accuracy. Features 3/8"-16 UNC coarse threads with right-hand thread direction and partial threading up to 1 1/4" minimum thread length. Full compliance with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations, making them suitable for global industrial applications requiring strict material safety standards.
