S-97345A644 5/16"-18 ASME B18.3 Shoulder Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance in harsh environments thanks to 316 stainless steel construction, ideal for chemical processing and marine applications.
• Exceptional mechanical strength with 70,000 psi tensile and 35,000 psi shear strength, ensuring reliable performance under high-stress conditions.
• Precise alignment and smooth rotation enabled by the 1 1/2" shoulder with tight diameter and length tolerances for accurate component positioning.
• Secure and repeatable fastening from the Class 3A thread fit and UNC coarse threads, providing excellent vibration resistance and easy assembly.
• Easy installation and removal with the hex socket drive and knurled head, allowing for high-torque application without slippage.
• Long-term durability and hardness backed by Rockwell B79 rating, reducing wear and extending service life in demanding operations.
• 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 and industrial equipment. The 1 1/2" shoulder length with minimal tolerances ensures exact alignment for rotating parts like bearings, pulleys, and gears, minimizing misalignment and reducing wear. The UNC coarse threads and Class 3A fit provide a secure, vibration-resistant connection, essential for assembly lines and heavy-duty applications. With a hex socket drive and knurled head, it allows for efficient installation in tight spaces, enhancing productivity. Its high tensile and shear strength, combined with excellent corrosion resistance from 316 stainless steel, makes it ideal for use in chemical plants, marine environments, and automated systems where reliability and longevity are paramount.

Specification Summary & Compliance

This shoulder screw features precise dimensions including a 5/16"-18 UNC thread with Class 3A fit for tight tolerances, a shoulder diameter of 3/8" with tolerance of -0.004" to -0.002", and shoulder length of 1 1/2" with tolerance of -0.005" to 0.005". It meets ASME B18.3 specifications for consistency and performance. The product is RoHS 3 (2015/863/EU) Compliant and REACH (EC 1907/2006) Compliant, ensuring it adheres to environmental and safety regulations for hazardous substances.