S-91251A755 9/16"-12 x 1 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 in high-stress applications and prevents fastener failure
- Superior corrosion resistance from the black-oxide finish on alloy steel extends service life in demanding industrial environments
- Precise Class 3A thread fit provides tighter tolerances for secure, vibration-resistant connections in critical assemblies
- Hex socket drive design allows for high-torque installation and removal in confined spaces with standard tools
- Coarse UNC threading enables faster installation and reduced cross-threading risks compared to fine-thread alternatives
- Full threading along the entire 1-1/4" length offers maximum adjustability and clamping force distribution
- Rockwell C37 hardness rating maintains thread integrity and prevents stripping during repeated use
Professional Applications & Engineering Value
These socket head cap screws deliver critical engineering advantages for industrial applications where high-strength fastening is essential. The black-oxide alloy steel construction provides superior corrosion protection while maintaining the 170,000 psi tensile strength needed for heavy machinery, automotive systems, and structural frameworks. The 9/16"-12 UNC coarse thread configuration ensures rapid assembly in production environments while the Class 3A thread fit guarantees precise engagement that resists loosening under vibration. The hex socket drive design enables high-torque installation in space-constrained applications, making these fasteners ideal for precision equipment, manufacturing fixtures, and maintenance operations requiring reliable, high-performance connections.
Specification Summary & Compliance
Manufactured to ASTM A574 specifications with Class 3A thread tolerances for precision fit. Features UNC coarse threading (9/16"-12) with right-hand direction and full threading along the 1-1/4" length. Compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations, ensuring safe use across industrial sectors.
