S-97832A138 3/8"-24 ASME B18.3 Shoulder Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance with 18-8 stainless steel construction, ideal for harsh environments and long-term reliability.
• Exceptional strength and durability from a Rockwell B55 hardness and 70,000 psi tensile strength, preventing failure under high stress.
• Precise alignment and smooth rotation ensured by the 3" shoulder with tight diameter and length tolerances for reduced wear.
• Secure, fine-threaded fastening with a 3/8"-24 UNF Class 3A thread fit, offering excellent vibration resistance and holding power.
• Easy installation and removal using the 1/4" hex socket drive and knurled head for improved grip and torque application.
• Compliance with major industry standards including ASME B18.3, RoHS 3, and REACH, ensuring quality and environmental safety.
• Reliable performance in shear applications with a minimum shear strength of 35,000 psi for demanding mechanical assemblies.

Professional Applications & Engineering Value

This 18-8 stainless steel shoulder screw is engineered to address critical alignment and durability challenges in industrial settings. The 3" shoulder length provides a precise bearing surface, minimizing misalignment and reducing wear in pivoting mechanisms, such as in machinery linkages, conveyor systems, and automation equipment. Its Class 3A UNF fine thread ensures a tight, vibration-resistant fit, crucial for maintaining integrity in dynamic applications. The knurled head and hex socket drive facilitate quick, secure assembly even in confined spaces. Made from corrosion-resistant stainless steel, it withstands exposure to moisture and chemicals, extending service life in demanding environments like food processing, marine, or outdoor equipment. This combination of precision shoulder design and robust material makes it an essential component for engineers seeking reliable, long-lasting fastening solutions.

Specification Summary & Compliance

This shoulder screw features a 3/8"-24 UNF fine thread with Class 3A fit for high precision and a shoulder diameter tolerance of -0.004" to -0.002" and length tolerance of -0.005" to 0.005" to ensure consistent performance. It is manufactured in compliance with ASME B18.3 specifications and meets RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental standards, confirming its suitability for regulated industries and global supply chains.