S-8077A318 3/8"-16 ASME B18.3 Shoulder Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance with 316 stainless steel construction, ideal for harsh industrial environments and chemical exposure.
• Enhanced durability and wear resistance from the black oxide finish, providing a protective layer against abrasion and galling.
• High-strength performance with 70,000 psi tensile and 35,000 psi shear strength, ensuring reliable load-bearing in demanding applications.
• Precise alignment and smooth rotation due to the 1/2" shoulder diameter and standard shoulder fit, minimizing component wear.
• Secure, non-slip installation with a knurled socket head and 1/4" hex drive, allowing for high-torque tightening without stripping.
• Consistent, reliable threading with Class 3A fit and 3/8"-16 UNC coarse thread, enabling quick assembly and vibration resistance.
• Compliance with industry standards including ASME B18.3, RoHS 3, and REACH, ensuring safety and environmental responsibility.

Professional Applications & Engineering Value

This 316 stainless steel shoulder screw is engineered to address common industrial challenges such as misalignment, corrosion, and mechanical stress. The black oxide finish not only enhances corrosion resistance but also reduces friction, making it ideal for rotating assemblies in machinery, automotive, and aerospace sectors. The 1/2" shoulder diameter and 1-5/8" shoulder length provide a precise pivot point or spacer, ensuring components like bearings and gears operate smoothly without lateral movement. With a Class 3A thread fit and coarse UNC thread, it offers quick installation and high vibration resistance, reducing maintenance downtime in industrial applications. Its 70,000 psi tensile strength and Rockwell B79 hardness guarantee long-term reliability under heavy loads, while the knurled socket head allows for secure tool engagement in confined spaces.

Specification Summary & Compliance

This shoulder screw features precise dimensional tolerances, including a shoulder diameter tolerance of -0.004" to -0.002" and shoulder length tolerance of -0.005" to 0.005", ensuring consistent performance. The thread fit adheres to Class 3A standards with a 3/8"-16 UNC coarse thread and right-hand direction. Manufactured in compliance with ASME B18.3 specifications, it also meets RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations, confirming its suitability for global industrial use without hazardous substances.