S-97832A145 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.
• Exceptional mechanical strength offering 70,000 psi tensile and 35,000 psi shear strength for reliable performance in high-stress applications.
• Precise alignment and smooth rotation ensured by the 1/2" diameter shoulder with tight tolerances, reducing wear on mating components.
• Secure and efficient installation using the 1/4" hex drive and knurled head, providing excellent grip and preventing tool slippage.
• Consistent and reliable threading with Class 3A fit and 5/16"-18 UNC coarse threads for easy assembly and strong holding power.
• Compliance with major industry standards including ASME B18.3, RoHS 3, and REACH, ensuring quality and environmental safety.
• Durable and wear-resistant with a Rockwell B55 hardness, maintaining integrity under repeated use and load.

Professional Applications & Engineering Value

This stainless steel shoulder screw is engineered to address critical alignment and pivot point challenges in precision machinery, automation systems, and industrial assemblies. The 1/2" shoulder diameter with controlled tolerances provides a stable bearing surface, preventing misalignment and reducing friction in rotating parts like gears, pulleys, and linkages. Made from 18-8 stainless steel, it resists rust and corrosion in demanding environments, from manufacturing floors to outdoor equipment. The 5/16"-18 UNC coarse thread and Class 3A thread fit ensure quick, secure fastening with high clamp load, while the socket head with hex drive allows for easy installation in confined spaces. This combination of material strength, dimensional precision, and standard compliance makes it a reliable choice for engineers seeking to enhance assembly durability and reduce maintenance downtime.

Specification Summary & Compliance

This shoulder screw features a 5/16"-18 UNC thread with Class 3A fit for precise engagement, and a shoulder diameter of 1/2" with tolerances from -0.004" to -0.002". The shoulder length is 1/2" with a tolerance of -0.005" to 0.005". It is manufactured in accordance with ASME B18.3 specifications and is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring it meets industry standards for performance and environmental safety.