S-94383A480 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 through black oxide finish, extending service life in harsh industrial environments
• Precision thread engagement with Class 3A fit ensuring consistent, vibration-resistant fastening in critical assemblies
• Enhanced durability from Rockwell C32 hardness alloy steel construction, maintaining dimensional stability under heavy loads
• Secure installation and removal with 1/4" hex drive and knurled head design for positive grip during torque application
• Accurate component alignment through precisely machined shoulder with tight diameter and length tolerances
• Industry compliance assurance meeting ASME B18.3 specifications and environmental regulations for global manufacturing requirements

Professional Applications & Engineering Value

This alloy steel shoulder screw delivers critical engineering solutions for demanding industrial applications where precision alignment and high strength are paramount. The 3/8"-16 UNC coarse thread with Class 3A fit provides superior engagement in metal components, resisting vibration loosening in machinery, automation systems, and rotating assemblies. The 1-1/2" shoulder length with tight tolerances ensures precise component spacing and rotational accuracy in bearing mounts, linkage systems, and precision guides. The black oxide finish offers reliable corrosion protection while maintaining dimensional integrity, making it ideal for manufacturing equipment, automotive fixtures, and industrial machinery where environmental exposure is a concern. The combination of 140,000 psi tensile strength and 84,000 psi shear strength addresses the need for reliable fastening in high-load applications, preventing component failure and reducing maintenance downtime.

Specification Summary & Compliance

This precision shoulder screw maintains Class 3A thread fit with UNC coarse thread spacing for optimal engagement in industrial applications. The shoulder features tight dimensional control with diameter tolerance of -0.004" to -0.002" and length tolerance of -0.005" to 0.005" for precise component alignment. Manufactured to ASME B18.3 specifications using ASTM A574 alloy steel with Rockwell C32 hardness, ensuring consistent mechanical properties. The product is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations, meeting international standards for industrial safety and material restrictions.