S-91264A585 5/16"-18 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
- Vibration-resistant locking with permanent nylon pellet that maintains secure fastening from -50° to 250°F, preventing loosening in dynamic applications
- Exceptional strength-to-weight ratio from alloy steel construction, delivering 140,000 psi tensile strength for heavy-duty mechanical assemblies
- Precision shoulder alignment with 1¼" length and tight diameter tolerance for accurate component positioning and reduced wear
- Superior thread engagement through Class 3A UNC coarse threads ensuring reliable installation and high shear resistance (84,000 psi minimum)
- Corrosion-resistant protection via black oxide finish that extends service life in industrial environments
- Enhanced grip and torque application with knurled socket head and 3/16" hex drive for secure tool engagement during installation
- Regulatory compliance assurance meeting ASME B18.3, RoHS 3, and REACH standards for quality and environmental safety
Professional Applications & Engineering Value
This alloy steel shoulder screw addresses critical engineering challenges in precision machinery and rotating assemblies. The 1¼" shoulder length with controlled diameter tolerance provides exact axial positioning for gears, pulleys, and bearings, eliminating misalignment issues that cause premature wear. The permanent nylon locking pellet embedded in the 5/16"-18 UNC coarse threads creates consistent vibration resistance across temperature fluctuations from -50° to 250°F, making it ideal for automotive, aerospace, and industrial equipment subjected to dynamic loads. Combined with 140,000 psi tensile strength and black oxide finish, this fastener delivers long-term reliability in high-stress applications while maintaining dimensional stability under continuous operation.
Specification Summary & Compliance
Manufactured to ASME B18.3 specifications with Class 3A thread fit for precision engagement. The shoulder features diameter tolerance of -0.004" to -0.002" and length tolerance of -0.005" to 0.005" for consistent performance. Compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental standards. Material certification to ASTM A574 ensures consistent Rockwell C32 hardness and mechanical properties.
