S-97832A149 5/16"-18 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.
• Enhanced assembly precision through Class 3A thread fit, ensuring tight, secure connections and reducing the risk of loosening.
• Exceptional mechanical strength offering 70,000 psi tensile and 35,000 psi shear strength for reliable performance under high-stress conditions.
• Improved grip and handling with a knurled head texture, allowing for easier manual installation and removal without slippage.
• Broad compatibility and standardization with UNC coarse threads and ASME B18.3 specifications, facilitating seamless integration into existing systems.
• Durable wear resistance due to Rockwell B55 hardness, maintaining structural integrity through repeated use.
• Environmental and regulatory compliance with RoHS 3 and REACH standards, ensuring safe, sustainable use in global markets.

Professional Applications & Engineering Value

This socket head shoulder screw is engineered to address critical alignment and load-bearing challenges in precision assemblies. The 1 1/2" shoulder length provides a stable, unthreaded bearing surface that maintains precise component positioning in machinery, pivoting mechanisms, and rotating assemblies. Made from 18-8 stainless steel, it resists corrosion in demanding environments like automotive, aerospace, and manufacturing equipment. The 5/16"-18 UNC coarse threads and Class 3A thread fit ensure rapid, secure fastening with high vibration resistance, reducing maintenance needs. The knurled head enhances grip during installation, while the hex drive allows for high-torque applications. Ideal for use in jigs, fixtures, and conveyor systems, this screw delivers reliable performance where exact tolerances and durability are paramount.

Specification Summary & Compliance

This shoulder screw adheres to ASME B18.3 standards, with precise dimensions including a shoulder diameter tolerance of -0.004" to -0.002" and shoulder length tolerance of -0.005" to 0.005". The UNC coarse threads feature a Class 3A fit for high accuracy, and the product is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring it meets international safety and environmental requirements.