S-97345A211 1/4"-20 ASME B18.3 Shoulder Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance with 316 stainless steel construction, ideal for harsh environments and extended service life.
• Precise alignment and reduced wear thanks to the Class 3A thread fit and standard shoulder fit, ensuring accurate assembly and smooth operation.
• High mechanical strength with 70,000 psi tensile and 35,000 psi shear strength, providing reliable performance under heavy loads.
• Easy installation and removal using a standard 5/32" hex drive and knurled head for improved grip and torque application.
• Dimensional stability and durability from Rockwell B79 hardness, maintaining integrity in demanding applications.
• Broad compatibility with UNC coarse threads and ASME B18.3 standards, ensuring interchangeability and quality assurance.
• Environmental and safety compliance with RoHS 3 and REACH regulations, supporting sustainable and safe industrial practices.

Professional Applications & Engineering Value

This 316 stainless steel shoulder screw is engineered to address critical challenges in precision machinery, such as misalignment and corrosion-induced failure. Its 1/4"-20 UNC coarse threads with Class 3A fit provide tight tolerances that minimize vibration and wear in high-stress assemblies, from rotating shafts to pivot points. The knurled head and hex drive facilitate quick, secure fastening in confined spaces, while the 1 3/4" shoulder length offers stable support for components like bearings and gears. Ideal for industries like aerospace, automotive, and marine, this screw combines corrosion resistance with high tensile and shear strength, ensuring long-term reliability in demanding environments without compromising on regulatory standards.

Specification Summary & Compliance

This shoulder screw adheres to precise dimensional tolerances, including a Class 3A thread fit for superior accuracy and a shoulder diameter tolerance of -0.004" to -0.002". It meets ASME B18.3 specifications for consistent manufacturing quality and is compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring it is free from hazardous substances and suitable for global industrial use.