S-91259A724 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
• Precision alignment and smooth rotation thanks to the 3" shoulder with tight diameter tolerance (-0.004" to -0.002") and length tolerance (-0.005" to 0.005")
• Superior corrosion resistance provided by the black oxide finish, extending service life in industrial environments
• High-strength alloy steel construction with Rockwell C32 hardness ensures durability and resistance to wear under heavy loads
• Secure installation and removal with 1/4" hex drive socket head and knurled texture for enhanced grip during assembly
• Reliable thread engagement through Class 3A UNC coarse threads (3/8"-16) that resist loosening under vibration
• Full regulatory compliance meeting ASME B18.3, ASTM A574, RoHS 3, and REACH standards for quality assurance

Professional Applications & Engineering Value

This alloy steel shoulder screw delivers critical engineering solutions where precise alignment and rotational movement are paramount. The 3" shoulder length with controlled tolerances provides exact positioning for components in machinery, while the black oxide finish offers essential corrosion protection in industrial environments. The Class 3A UNC threads ensure secure fastening in high-vibration applications, and the socket head with hex drive allows for efficient installation in confined spaces. These shoulder screws are engineered to maintain structural integrity in demanding applications such as precision machinery, automotive assemblies, and heavy equipment where 140,000 psi tensile strength prevents failure under extreme loads.

Specification Summary & Compliance

This shoulder screw features precision Class 3A thread fit with 3/8"-16 UNC coarse threading and maintains tight shoulder diameter tolerance (-0.004" to -0.002") and shoulder length tolerance (-0.005" to 0.005"). Manufactured to ASME B18.3 specifications using ASTM A574 alloy steel, it complies with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental standards for industrial use.