S-91259A435 3/8"-16 ASME B18.3, ASTM A574 Shoulder Screws

Key Features & Benefits at a Glance

• Exceptional load-bearing capacity with 140,000 psi tensile strength and 84,000 psi shear strength for reliable performance in demanding applications
• Precise thread engagement with Class 3A fit and UNC coarse threads ensuring secure fastening and vibration resistance
• Superior corrosion protection through black oxide finish that extends service life in harsh industrial environments
• Enhanced grip and torque application with knurled socket head and 1/4" hex drive for secure tool engagement
• Consistent dimensional accuracy with controlled shoulder diameter and length tolerances for precise component alignment
• Optimized material performance through Rockwell C32 hardness for excellent wear resistance and durability
• Regulatory compliance assurance meeting ASME B18.3, RoHS 3, and REACH standards for quality and environmental safety

Professional Applications & Engineering Value

This 3/8"-16 UNC shoulder screw delivers exceptional engineering value in precision mechanical assemblies where accurate component positioning and reliable fastening are critical. The alloy steel construction with black oxide finish provides superior corrosion resistance in industrial environments, while the Class 3A thread fit ensures tight tolerances for vibration-resistant connections. The knurled socket head with 1/4" hex drive facilitates secure torque application in confined spaces, making it ideal for machinery, automation systems, and precision equipment requiring shoulder fastening solutions. The controlled shoulder dimensions maintain precise alignment in rotating assemblies and bearing applications, reducing wear and extending component life.

Specification Summary & Compliance

This shoulder screw features Class 3A thread fit with UNC coarse threads (3/8"-16) and maintains tight dimensional control with shoulder diameter tolerance of -0.004" to -0.002" and shoulder length tolerance of -0.005" to 0.005". Manufactured to ASME B18.3 specifications using ASTM A574 alloy steel, the fastener demonstrates compliance with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations, ensuring both mechanical reliability and regulatory adherence for industrial applications.