S-97768A396 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 wear resistance and reduced light reflection thanks to the black oxide finish, providing added durability and a professional appearance.
• Exceptional mechanical strength offering 70,000 psi tensile and 35,000 psi shear strength for reliable performance in high-stress applications.
• Precise component alignment and rotation enabled by the 4" shoulder with tight length tolerance (±0.005") and standard fit.
• Secure, high-precision thread engagement with Class 3A UNC coarse threads, ensuring consistent clamping force and vibration resistance.
• Easy installation and removal using a standard 3/16" hex key drive and knurled head for improved grip and torque application.
• Guaranteed compliance and reliability meeting ASME B18.3 specifications and being RoHS 3 & REACH compliant for global industrial use.

Professional Applications & Engineering Value

This shoulder screw is engineered to solve critical alignment and pivot point challenges in industrial machinery, automation systems, and precision assemblies. The 4" shoulder length with minimal tolerance provides a stable bearing surface for rotating components like gears, pulleys, and linkages, preventing misalignment and reducing wear. Manufactured from 18-8 Stainless Steel with a black oxide finish, it resists corrosion in demanding environments, from manufacturing floors to outdoor equipment. The 5/16"-18 UNC coarse thread and Class 3A fit ensure quick assembly and high vibration resistance, while the hex socket drive and knurled head allow for secure tightening in confined spaces. This combination of high tensile strength and precise dimensions makes it a reliable choice for applications requiring durability and exacting performance.

Specification Summary & Compliance

This shoulder screw features a 5/16"-18 UNC coarse thread with a Class 3A thread fit for precision engagement. The shoulder diameter is 3/8" with a tolerance of -0.004" to -0.002", and the shoulder length is 4" with a tight tolerance of ±0.005". It is manufactured in compliance with ASME B18.3 standards and is certified RoHS 3 (2015/863/EU) Compliant and REACH (EC 1907/2006) Compliant, ensuring it meets rigorous safety and environmental regulations for industrial use.