S-90298A172 5/16"-18 ASME B18.3 Shoulder Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance with 18-8 stainless steel and passivated finish, ensuring long-term reliability in harsh environments.
• Precise alignment and secure positioning thanks to the knurled head and tight shoulder tolerances (±0.001" diameter, ±0.005" length).
• High-strength, reliable fastening with Class 3A thread fit and UNC coarse threads for optimal load distribution and vibration resistance.
• Easy installation and removal using a standard 3/16" hex drive, reducing assembly time and tool wear.
• Durable, industry-compliant construction meeting ASME B18.3 specifications for consistent performance in demanding applications.
• Environmental and safety compliance with RoHS 3 and REACH regulations, ensuring safe use in various industrial settings.
• Versatile right-hand threading for standard assembly processes, compatible with common UNC nuts and components.

Professional Applications & Engineering Value

This 18-8 stainless steel shoulder screw is engineered to address critical alignment and durability challenges in industrial machinery, automation systems, and precision equipment. The passivated finish enhances corrosion resistance, making it ideal for environments exposed to moisture, chemicals, or outdoor conditions. Its knurled head provides improved grip during manual adjustments, while the UNC coarse threads and Class 3A thread fit ensure secure, vibration-resistant connections in high-stress assemblies. The precise shoulder diameter and length tolerances allow for exact component positioning, reducing wear and misalignment in rotating parts or bearing mounts. By integrating ASME B18.3 standards, this screw delivers consistent dimensional accuracy, streamlining maintenance and replacement in industrial shoulder bolt applications such as pivots, shafts, and guides.

Specification Summary & Compliance

This shoulder screw adheres to Class 3A thread fit and UNC coarse thread standards (5/16"-18), with shoulder diameter tolerance of -0.001" to 0.001" and shoulder length tolerance of -0.005" to 0.005". Manufactured in compliance with ASME B18.3 specifications, it also meets RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations, ensuring safe and restricted substance-free use.