S-94383A410 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 minimum shear strength for reliable performance in demanding applications
• Superior corrosion and wear resistance thanks to the black oxide finish, extending service life in harsh industrial environments
• Precise component alignment and smooth rotation enabled by the 1/2" shoulder diameter with tight tolerance control
• Secure, non-slip installation with the knurled socket head and 1/4" hex drive for easy torque application
• High thread reliability with Class 3A fit and coarse UNC thread for quick assembly and vibration resistance
• Enhanced durability from Rockwell C32 hardness alloy steel construction, resisting deformation under stress
• Broad regulatory compliance meeting ASME B18.3, ASTM A574, RoHS 3, and REACH standards for global industrial use

Professional Applications & Engineering Value

This 3/8"-16 UNC shoulder screw delivers critical engineering value in applications requiring precise shaft alignment and rotational movement, such as machinery assemblies, pivoting mechanisms, and conveyor systems. The alloy steel construction with Rockwell C32 hardness ensures dimensional stability under high loads, while the black oxide finish provides a protective layer against rust and abrasion in industrial settings. The 1/2" shoulder diameter with controlled tolerances acts as a reliable bearing surface, reducing wear on mating components. Combined with the Class 3A thread fit and coarse UNC threading, it offers secure fastening and resistance to loosening in high-vibration environments, making it ideal for precision shoulder bolt applications in automotive, aerospace, and heavy equipment manufacturing.

Specification Summary & Compliance

This shoulder screw features a Class 3A thread fit with 3/8"-16 UNC coarse threading and precise shoulder dimensions (1/2" diameter with -0.004" to -0.002" tolerance, 1/4" length with -0.005" to 0.005" tolerance). Manufactured to ASME B18.3 specifications using ASTM A574 alloy steel, it is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations, ensuring safe and reliable use in global industrial markets.