S-8077A588 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 a protective layer against abrasion and galling.
• High-strength performance with 70,000 psi tensile strength and 35,000 psi shear strength, ensuring reliable load-bearing in demanding applications.
• Precise alignment and smooth rotation due to the knurled head and standard shoulder fit, minimizing component misalignment and wear.
• Secure, high-tolerance fastening with Class 3A thread fit and UNC coarse thread, offering excellent vibration resistance and ease of assembly.
• Easy installation and removal using a standard 3/16" hex drive socket head, reducing tool slippage and maintenance time.
• Compliance with industry standards including ASME B18.3, RoHS 3, and REACH, ensuring safety, quality, and environmental responsibility.

Professional Applications & Engineering Value

This 316 stainless steel shoulder screw is engineered to address critical challenges in precision machinery, automation, and assembly systems. The black oxide finish enhances corrosion resistance, making it suitable for applications exposed to moisture, chemicals, or outdoor conditions, such as in marine equipment or food processing machinery. The knurled head and standard shoulder diameter provide stable alignment for rotating components like bearings, pulleys, and gears, reducing friction and extending service life. With a Class 3A thread fit and UNC coarse thread, it ensures tight, reliable fastening in high-vibration environments, from automotive assemblies to industrial robots. The combination of high tensile and shear strength supports heavy-duty use, while the hex drive socket head allows for efficient installation in confined spaces, streamlining maintenance and reducing downtime.

Specification Summary & Compliance

This shoulder screw adheres to precise dimensional standards, including a Class 3A thread fit for tight tolerances and UNC coarse thread with 5/16"-18 size. The shoulder diameter is 3/8" with a tolerance of -0.004" to -0.002", and shoulder length is 1-1/4" with a tolerance of -0.005" to 0.005", ensuring consistent performance in alignment applications. It meets ASME B18.3 specifications for dimensional accuracy and is compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, confirming it is free from hazardous substances and suitable for global industrial use.