S-91251A656 3/8"-16 x 9 1/2" 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 applications, reducing the risk of fastener failure
- Class 3A thread fit provides superior precision and tighter tolerances for secure fastening in critical assemblies
- Black-oxide coating on alloy steel offers enhanced corrosion resistance and durability in demanding industrial environments
- Partially threaded design allows for optimal clamping force distribution while maintaining unthreaded shaft stability
- Hex socket drive (5/16") enables high-torque installation with standard tools, preventing cam-out and ensuring proper seating
- Rockwell C37 hardness maintains structural integrity under repeated loading and vibration conditions
- Coarse UNC threads facilitate quicker assembly and reduced cross-threading risks in production environments
Professional Applications & Engineering Value
This black-oxide alloy steel socket head cap screw delivers critical engineering solutions for heavy machinery, automotive assemblies, and industrial equipment where vibration resistance and structural integrity are paramount. The 3/8"-16 UNC coarse thread configuration combined with Class 3A precision ensures secure fastening in high-vibration environments while the partially threaded design provides optimal stress distribution across joint interfaces. The hex socket drive system allows for high-torque installation in confined spaces, making it ideal for precision equipment, manufacturing fixtures, and structural frameworks requiring reliable, high-strength fastening solutions that withstand extreme operational demands.
Specification Summary & Compliance
Manufactured to ASTM A574 specifications with Class 3A thread fit precision and UNC coarse thread profile. This 9-1/2" length socket head cap screw features partial threading with minimum 1-1/4" thread length and meets comprehensive compliance standards including RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations.
