S-91259A491 3/8"-16 ASME B18.3, ASTM A574 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
- Superior corrosion resistance through black oxide finish, extending service life in demanding industrial environments
- Precise component alignment with Class 3A thread fit and controlled shoulder diameter tolerances for consistent assembly
- Enhanced grip and handling thanks to knurled head texture, facilitating easier installation and removal
- Optimized torque transmission with 1/4" hex drive socket head design, preventing tool slippage during tightening
- Industry-standard compatibility through UNC coarse thread pattern and ASME B18.3 compliance for seamless integration
- Environmental regulation compliance meeting RoHS 3 and REACH standards for safe, sustainable manufacturing
Professional Applications & Engineering Value
This alloy steel shoulder screw delivers critical engineering solutions for precision machinery and industrial equipment. The 3/8"-16 UNC coarse thread configuration ensures rapid assembly while maintaining Class 3A thread fit accuracy for vibration-resistant connections. The 1/2" shoulder diameter provides exact component positioning in rotating assemblies, jigs, and fixtures, eliminating misalignment issues. The black oxide finish creates a protective barrier against corrosion in manufacturing environments, while the Rockwell C32 hardness maintains dimensional stability under repeated loads. These shoulder screws are engineered to withstand the rigors of automation systems, conveyor equipment, and precision tooling applications where reliability and repeatability are paramount.
Specification Summary & Compliance
Manufactured to exacting standards with Class 3A thread fit precision and shoulder diameter tolerance of -0.004" to -0.002". Thread specifications conform to UNC coarse thread standards with 3/8"-16 sizing. Complies with ASME B18.3 dimensional requirements and material specifications per ASTM A574. Meets RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental compliance standards for restricted substances.
