S-91251A512 2-56 x 1 3/8" 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 for reliable performance in high-stress industrial applications
- Superior thread precision with Class 3A fit ensures secure fastening and vibration resistance
- Enhanced corrosion resistance through black-oxide coating on alloy steel for extended service life
- Optimized drive engagement with 5/64" hex socket for secure tool connection and reduced stripping risk
- Versatile partial threading design allows for both clamping and alignment functions in assemblies
- High hardness rating (Rockwell C37) maintains thread integrity and prevents deformation under load
- Coarse UNC threading provides rapid installation and superior performance in various materials
Professional Applications & Engineering Value
These black-oxide alloy steel socket head cap screws deliver critical performance advantages in demanding industrial environments. The combination of Class 3A thread fit and 170,000 psi tensile strength addresses common failure points in machinery, automotive, and precision equipment applications where vibration resistance and joint integrity are paramount. The UNC coarse thread pattern ensures rapid assembly while maintaining holding power, while the partial threading design allows for precise clamping force distribution. The black-oxide surface treatment provides essential corrosion protection without dimensional compromise, making these socket head screws ideal for applications requiring both precision fit and environmental durability. The standardized hex drive socket design ensures compatibility with common industrial tools, streamlining maintenance and assembly processes.
Specification Summary & Compliance
Manufactured to ASTM A574 specifications with Class 3A thread fit precision and UNC coarse thread spacing. Features include 5/8" minimum thread length, 1 3/8" overall length, and right-hand thread direction. Fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations, ensuring suitability for global industrial markets and restricted substance requirements.
