S-91259A446 5/8"-11 ASME B18.3, ASTM A108 Shoulder Screws
Shoulder 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 load-bearing capacity with 140,000 psi tensile strength for reliable performance in high-stress applications
- Precision thread engagement with Class 3A fit ensuring secure fastening and vibration resistance
- Superior corrosion protection through black oxide finish extending service life in demanding environments
- Enhanced grip and torque application with knurled head and 3/8" hex drive for secure installation
- Accurate component alignment through precisely machined shoulder with tight diameter tolerance
- Industry-standard compatibility with UNC coarse threads for easy replacement and maintenance
- Long-term reliability supported by Rockwell C32 hardness for consistent performance under repeated use
Professional Applications & Engineering Value
This alloy steel shoulder screw delivers critical engineering solutions for industrial machinery and precision equipment. The black oxide finish provides essential corrosion resistance in manufacturing environments, while the Class 3A thread fit maintains precise alignment in rotating assemblies and bearing applications. The knurled socket head with hex drive ensures secure torque transmission during installation, preventing slippage in high-vibration settings. Engineered with UNC coarse threads and precise shoulder dimensions, this fastener solves alignment challenges in automotive, aerospace, and heavy equipment applications where dimensional accuracy and 140,000 psi tensile strength are paramount for operational safety and longevity.
Specification Summary & Compliance
Manufactured to exacting standards with Class 3A thread fit precision and UNC thread specifications. The shoulder features tight dimensional control with diameter tolerance of -0.004" to -0.002" and length tolerance of -0.005" to 0.005". Full compliance with ASME B18.3 specifications, ASTM A108 material standards, RoHS 3 (2015/863/EU) environmental directives, and REACH (EC 1907/2006) regulatory requirements ensures suitability for global industrial applications.
