S-91259A728 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 harsh industrial environments
• Precision thread engagement with Class 3A thread fit ensuring secure fastening and vibration resistance
• Enhanced grip and torque application through knurled head texture and 1/4" hex drive for easy installation
• Accurate component alignment with 1/2" shoulder diameter and 4" shoulder length maintaining precise positioning
• High durability from Rockwell C32 hardness alloy steel construction for long-term reliability
• Industry compliance assurance meeting ASME B18.3, ASTM A574, RoHS 3, and REACH standards for quality and safety

Professional Applications & Engineering Value

This 3/8"-16 UNC shoulder screw delivers critical engineering solutions for industrial applications requiring precise component alignment and robust fastening. The alloy steel construction with Rockwell C32 hardness provides exceptional strength-to-weight ratio, while the black oxide finish offers superior corrosion protection in demanding environments. The Class 3A thread fit and UNC coarse threading ensure secure engagement and vibration resistance in machinery, automation systems, and precision equipment. The 4" shoulder length and 1/2" shoulder diameter maintain accurate alignment in rotating assemblies, pivot points, and bearing mounts, reducing wear and extending component life. The combination of high tensile strength and knurled head texture makes this socket head shoulder screw ideal for applications where reliability, precision, and easy maintenance are paramount.

Specification Summary & Compliance

This shoulder screw features precision Class 3A thread fit with UNC coarse threading (3/8"-16) and maintains tight tolerances for shoulder diameter (-0.004" to -0.002") and shoulder length (-0.005" to 0.005"). Manufactured to ASME B18.3 specifications and ASTM A574 standards, ensuring dimensional accuracy and mechanical properties. The product is fully RoHS 3 (2015/863/EU) Compliant and REACH (EC 1907/2006) Compliant, meeting international environmental and safety regulations for industrial fasteners.