S-91259A440 1/2"-13 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
- Superior corrosion resistance with black oxide finish, extending service life in harsh industrial environments
- Exceptional mechanical strength with 140,000 psi tensile strength and 84,000 psi shear strength for heavy-duty applications
- Precision Class 3A thread fit ensures secure fastening and reliable performance in high-vibration settings
- Knurled socket head design provides enhanced grip and prevents tool slippage during installation
- Coarse UNC threading enables quick assembly and disassembly while maintaining holding power
- Strict dimensional tolerances on shoulder components guarantee consistent fit and alignment in precision machinery
- Comprehensive compliance with ASME B18.3, ASTM A574, RoHS 3, and REACH standards for quality assurance
Professional Applications & Engineering Value
This alloy steel shoulder screw with black oxide finish delivers critical performance in demanding industrial applications where precision alignment and high strength are paramount. The 1/2"-13 UNC coarse thread configuration combined with Class 3A thread fit provides superior resistance to vibration loosening in heavy machinery, automotive assemblies, and manufacturing equipment. The precisely machined shoulder with tight diameter and length tolerances ensures accurate component positioning in rotating mechanisms, pivot points, and bearing mounts. With Rockwell C32 hardness and exceptional tensile strength, this socket head shoulder bolt maintains integrity under extreme loads while the corrosion-resistant finish protects against degradation in challenging environments.
Specification Summary & Compliance
Manufactured to exacting standards with Class 3A thread fit per UNC specifications and precision shoulder tolerances (diameter: -0.004" to -0.002", length: -0.005" to 0.005"). Complies with ASME B18.3 dimensional requirements and ASTM A574 material specifications. Meets RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental compliance standards for restricted substances.
