S-97345A525 1/4"-20 ASME B18.3 Shoulder Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance in harsh environments thanks to 316 stainless steel construction
• Exceptional mechanical strength with 70,000 psi tensile strength and 35,000 psi shear strength for high-stress applications
• Precise, reliable fit ensured by Class 3A thread fit and standard shoulder fit for minimal play
• Easy installation and removal with a 5/32" hex drive and knurled head for improved grip
• Durable, long-lasting performance backed by Rockwell B79 hardness for wear resistance
• Broad industrial compatibility with UNC coarse threads and right-hand threading for common machinery
• Secure assembly integrity from a 7/16" shoulder length providing stable component alignment

Professional Applications & Engineering Value

This 1/4"-20 UNC Class 3A shoulder screw is engineered to address critical needs in precision assemblies where alignment, strength, and corrosion resistance are paramount. The 316 stainless steel material offers excellent resistance to chemicals and moisture, making it ideal for marine, chemical processing, and food industry equipment. The socket head with hex drive allows for high-torque installation in confined spaces, while the knurled texture enhances handling during assembly. Its coarse thread and Class 3A fit ensure quick, secure fastening with high fatigue resistance, reducing maintenance and downtime in automated machinery, pivoting joints, and rotating assemblies.

Specification Summary & Compliance

This shoulder screw adheres to ASME B18.3 specifications, with a Class 3A thread fit for tight tolerances and a shoulder diameter tolerance of -0.004" to -0.002". It is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring it meets environmental and safety standards for industrial use worldwide.