S-91259A714 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 high-stress applications
• Superior corrosion resistance provided by the black oxide finish, extending service life in demanding industrial environments
• Precision shoulder alignment with controlled diameter tolerance (-0.004" to -0.002") ensuring accurate component positioning
• Enhanced grip and torque application through knurled head texture and 1/4" hex drive socket for secure installation
• Industry-standard compatibility with UNC coarse threads (Class 3A fit) for reliable engagement and vibration resistance
• Consistent hardness performance at Rockwell C32 for durability across repeated assembly cycles
• Regulatory compliance assurance meeting ASME B18.3 specifications and environmental standards (RoHS 3, REACH)

Professional Applications & Engineering Value

This alloy steel shoulder screw delivers critical engineering solutions for precision assembly applications where alignment accuracy and structural integrity are paramount. The 3/8"-16 UNC coarse thread configuration provides excellent engagement in various materials while resisting vibration-induced loosening. The black oxide finish creates a protective barrier against corrosion in industrial environments, significantly extending component lifespan. The precisely machined shoulder with controlled diameter tolerance (-0.004" to -0.002") ensures accurate positioning of rotating components, bearings, and linkages in machinery, automation equipment, and precision instruments. With its socket head design and knurled texture, installation torque is efficiently transferred while preventing tool slippage during high-torque applications.

Specification Summary & Compliance

This shoulder screw maintains Class 3A thread fit per UNC standards with precise shoulder diameter tolerance (-0.004" to -0.002") and shoulder length tolerance (-0.005" to 0.005"). Manufacturing complies with ASME B18.3 specifications where identified as ASTM A574. The product is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations, meeting the January 17, 2023 SVHC requirements.