S-97345A592 1/4"-28 ASME B18.3 Shoulder Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance in harsh environments thanks to 316 stainless steel construction, ensuring long-term reliability and reduced maintenance costs.
• Exceptional mechanical strength with a tensile strength of 70,000 psi and shear strength of 35,000 psi, providing secure, high-load fastening for demanding applications.
• Precise alignment and smooth rotation enabled by the Class 3A thread fit and standard shoulder fit, minimizing wear and ensuring consistent performance.
• Easy installation and removal with the 3/16" hex socket drive and knurled head, offering superior grip and torque application without slippage.
• Reliable dimensional stability from tight shoulder tolerances (diameter: -0.004" to -0.002", length: -0.005" to 0.005"), guaranteeing accurate assembly and interchangeability.
• Compliance with major industry standards including ASME B18.3, RoHS 3, and REACH, ensuring product safety, environmental responsibility, and global acceptance.
• Optimized for fine-thread applications with the 1/4"-28 UNF thread, providing enhanced vibration resistance and superior clamping force in precision assemblies.

Professional Applications & Engineering Value

This 316 stainless steel shoulder screw is engineered to address critical challenges in precision machinery, automation systems, and medical equipment where alignment, corrosion resistance, and high strength are paramount. The fine UNF thread and Class 3A fit ensure minimal backlash and reliable performance in high-vibration environments, preventing loosening over time. The knurled head and hex socket drive facilitate secure tool engagement, reducing installation errors and tool wear. With a 1" shoulder length held to tight tolerances, it acts as a precise pivot or spacer, eliminating misalignment in rotating assemblies like bearings, linkages, and pivots. Its full compliance with ASME B18.3 and environmental regulations makes it a trusted choice for OEMs and MRO professionals seeking durability and regulatory adherence.

Specification Summary & Compliance

This shoulder screw adheres to Class 3A thread fit for high-precision assemblies and is manufactured in accordance with ASME B18.3 specifications. Key dimensional tolerances include shoulder diameter tolerance of -0.004" to -0.002" and shoulder length tolerance of -0.005" to 0.005". The product is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006), ensuring it meets stringent environmental and safety standards for global industrial use.