S-90298A156 8-32 ASME B18.3 Shoulder Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance with 18-8 stainless steel construction and passivated finish, ensuring long-term reliability in harsh industrial environments.
• Precise component alignment thanks to the 3/16" shoulder diameter with tight tolerance, minimizing play and improving assembly accuracy.
• High-strength thread engagement with Class 3A fit and 8-32 UNC coarse thread, providing secure fastening and vibration resistance.
• Efficient installation and removal using the hex socket drive, allowing for high torque application in confined spaces.
• Durable and smooth operation from the standard socket head profile and smooth head texture, reducing wear during repeated use.
• Broad regulatory compliance including ASME B18.3, RoHS 3, and REACH, ensuring safety and environmental standards are met for global supply chains.
• Optimized for heavy-duty applications with a 1 1/4" shoulder length, providing stable support for rotating parts and mechanical assemblies.

Professional Applications & Engineering Value

This stainless steel shoulder screw is engineered to address critical alignment and durability challenges in industrial applications. The 18-8 stainless steel material combined with a passivated finish offers excellent resistance to corrosion and oxidation, making it ideal for machinery exposed to moisture or chemicals. The 3/16" shoulder diameter with minimal tolerance ensures precise location of components, reducing misalignment and wear in assemblies like pivots, gears, and linkages. The 8-32 UNC coarse thread and Class 3A thread fit deliver reliable clamping force and vibration resistance, essential for high-stress environments. With a hex socket drive, installation is straightforward even in tight spaces, enhancing maintenance efficiency. These screws are commonly used in precision engineering, automotive, and electronics for robust, long-lasting performance.

Specification Summary & Compliance

This shoulder screw features a Class 3A thread fit for high precision, with UNC coarse threads and a shoulder diameter tolerance of -0.001" to 0.001" for exact alignment. It complies with ASME B18.3 manufacturing standards, ensuring consistent quality and interchangeability. The product is RoHS 3 (2015/863/EU) Compliant and REACH (EC 1907/2006) Compliant, meeting environmental and safety regulations for hazardous substances.