S-8077A336 5/16"-18 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 long-lasting performance under heavy use
• High-strength reliability with 70,000 psi tensile strength and 35,000 psi shear strength for demanding mechanical applications
• Precise alignment and smooth rotation ensured by the 2-1/2" shoulder with tight diameter tolerance for reduced vibration and wear
• Secure, non-slip installation thanks to the knurled socket head and 1/4" hex drive for firm tool grip
• Accurate thread engagement with Class 3A UNC coarse threads, offering consistent fastening in high-vibration settings
• Compliance with industry standards including ASME B18.3, RoHS 3, and REACH for quality assurance and environmental safety

Professional Applications & Engineering Value

This 316 stainless steel shoulder screw is engineered to address critical challenges in precision machinery and industrial assemblies. The black oxide finish enhances corrosion resistance, making it suitable for applications exposed to moisture, chemicals, or outdoor conditions. Its 2-1/2" shoulder length provides a stable pivot or spacer, reducing misalignment and bearing wear in rotating components like conveyor systems, robotic arms, and automotive fixtures. The 5/16"-18 UNC coarse thread and Class 3A fit ensure reliable fastening in high-vibration environments, while the knurled socket head allows for secure tool engagement during installation. Ideal for use in manufacturing, aerospace, and marine sectors, this screw delivers long-term performance by minimizing maintenance needs and downtime.

Specification Summary & Compliance

This shoulder screw features precise dimensional tolerances, including a shoulder diameter of 1/2" with a tolerance of -0.004" to -0.002" and shoulder length of 2-1/2" with a tolerance of -0.005" to 0.005". Thread specifications include 5/16"-18 UNC coarse threads with a Class 3A fit for high accuracy. It complies with ASME B18.3 manufacturing standards and meets RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations, ensuring safety and quality in industrial applications.