S-90298A739 3/8"-16 ASME B18.3 Shoulder Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance with 18-8 Stainless Steel construction, ideal for harsh industrial environments and extended service life.
• Precise component alignment ensured by the 1/2" diameter shoulder with tight tolerances, reducing wear and misalignment in assemblies.
• High tensile and shear strength (70,000 psi and 35,000 psi minimum) for reliable performance in heavy-duty and high-stress applications.
• Secure, non-slip fastening provided by the knurled head and hex socket drive, allowing for high torque application and easy installation.
• Consistent and reliable threading with Class 3A UNC coarse threads, ensuring a precise fit and reducing the risk of cross-threading.
• Broad industrial compliance meeting ASME B18.3 standards, RoHS 3, and REACH, ensuring quality and environmental safety for global supply chains.
• Optimized for machinery and pivoting parts with a long 6-1/2" shoulder, serving as an ideal alignment pin or shaft in rotating assemblies.

Professional Applications & Engineering Value

This 18-8 Stainless Steel shoulder screw is engineered to address critical alignment and durability challenges in industrial machinery. The 1/2" shoulder diameter with minimal tolerance provides a precise bearing surface, minimizing play and wear in pivoting joints and linkages. The 3/8"-16 UNC coarse thread and Class 3A fit enable quick assembly and a secure hold in heavy-duty applications, from conveyor systems to robotic arms. The knurled head and hex socket drive offer superior grip for high-torque fastening, even in greasy conditions. Made from corrosion-resistant stainless steel, it withstands demanding environments, reducing maintenance downtime and ensuring long-term operational reliability in precision engineering and automation.

Specification Summary & Compliance

This shoulder screw adheres to ASME B18.3 specifications, with a Class 3A thread fit for superior precision. The shoulder diameter tolerance is -0.004" to -0.002", and shoulder length tolerance is -0.005" to 0.005", ensuring exact dimensional control. It is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, confirming its suitability for industrial use without hazardous substances.