S-91864A031 1/2"-20 x 3 1/4" 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 under extreme loads and vibrations
- Superior corrosion resistance with black-oxide coating extends service life in harsh industrial environments
- Precision Class 3A thread fit provides secure fastening with minimal backlash in critical assemblies
- Fine UNF threading offers better adjustment control and vibration resistance compared to coarse threads
- Rockwell C37 hardness maintains structural integrity and prevents deformation during installation
- 3/8" hex drive design allows for high torque application with standard tools while preventing cam-out
- Partially threaded shank provides unthreaded bearing surface for improved clamping force distribution
Professional Applications & Engineering Value
These black-oxide alloy steel socket head cap screws deliver critical performance advantages in demanding applications where reliability is non-negotiable. The combination of UNF fine threading and Class 3A thread fit ensures precise engagement in machinery, automotive components, and precision equipment where vibration resistance is essential. The 170,000 psi tensile strength and Rockwell C37 hardness provide exceptional load-bearing capacity while resisting shear forces in heavy-duty assemblies. The corrosion-resistant black-oxide surface treatment protects against environmental degradation in manufacturing facilities, outdoor equipment, and marine applications, significantly extending maintenance intervals and reducing total cost of ownership.
Specification Summary & Compliance
Manufactured to exacting inch system dimensions with 1/2"-20 UNF fine threading and precision Class 3A thread fit tolerances. These socket head cap screws conform to ASTM A574 specification for high-strength alloy steel fasteners and demonstrate compliance with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations, ensuring they meet current industry standards for restricted substances and chemical safety in industrial applications worldwide.
