S-91259A727 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 industrial applications
• Superior corrosion resistance thanks to the black oxide finish, extending service life in demanding environments
• Precise component alignment enabled by the 1/2" shoulder diameter with tight tolerance control for reduced assembly vibration
• Enhanced torque transmission through the Class 3A thread fit and coarse UNC thread spacing for secure fastening in heavy machinery
• Easy installation and maintenance with standard hex drive socket and knurled head design for non-slip tool engagement
• Long-term durability from Rockwell C32 hardened alloy steel construction that withstands repeated use cycles
• Regulatory compliance assurance meeting ASME B18.3 specifications and environmental standards (RoHS 3/REACH) for global industrial use

Professional Applications & Engineering Value

This 3/8"-16 UNC shoulder screw delivers critical engineering solutions for precision industrial assemblies where component alignment and rotational stability are paramount. The alloy steel construction with black oxide finish provides exceptional corrosion resistance in manufacturing environments exposed to moisture and chemicals. The precisely machined 1/2" shoulder diameter acts as a built-in locating dowel, eliminating the need for additional alignment components in machinery, conveyor systems, and robotic assemblies. The Class 3A thread fit ensures vibration-resistant fastening in dynamic applications, while the coarse thread spacing enables rapid assembly in production environments. With its knurled head texture and standard hex drive socket, this fastener simplifies maintenance operations in tight spaces, making it ideal for automotive jigs, packaging equipment, and industrial automation systems requiring reliable, precision fastening solutions.

Specification Summary & Compliance

This shoulder screw maintains precision dimensional control with shoulder diameter tolerance of -0.004" to -0.002" and shoulder length tolerance of -0.005" to 0.005". The thread system follows UNC standards with Class 3A fit for superior engagement. Manufacturing complies with ASME B18.3 specifications and material meets ASTM A574 requirements. The product is fully RoHS 3 (2015/863/EU) Compliant and REACH (EC 1907/2006) Compliant, ensuring environmental regulation adherence for international industrial applications.