S-97345A671 1/4"-20 ASME B18.3 Shoulder Screws

Key Features & Benefits at a Glance

• Exceptional corrosion resistance in harsh environments due to 316 stainless steel construction, ideal for chemical processing and marine applications.
• Superior load-bearing capability with a high 70,000 psi tensile strength, ensuring reliable performance under heavy mechanical stress.
• Precise alignment and smooth rotation for components like gears and pulleys, enabled by the consistent 3/8" shoulder diameter and standard fit.
• Secure, non-slip installation with the knurled socket head and 3/16" hex drive, providing excellent grip and torque application.
• Durable thread engagement from the Class 3A fit and coarse 1/4"-20 UNC threads, reducing cross-threading risks in high-vibration settings.
• Compliance with stringent industry standards including ASME B18.3, RoHS 3, and REACH, ensuring safety and environmental responsibility.
• Optimized for repetitive assembly with a robust Rockwell B79 hardness, maintaining integrity through multiple use cycles.

Professional Applications & Engineering Value

This 316 stainless steel shoulder screw is engineered to address common industrial challenges, such as component misalignment and corrosion-induced failure. The 1/4"-20 UNC coarse thread with Class 3A fit ensures quick, secure fastening in high-vibration machinery, reducing downtime in assembly lines. Its knurled socket head design enhances grip for efficient torque application, even in confined spaces. Ideal for precision applications like rotating shafts in conveyor systems or linkages in automotive assemblies, the screw's 1 5/8" shoulder length provides a stable bearing surface, preventing lateral movement and wear. Made from corrosion-resistant 316 stainless steel, it withstands exposure to moisture, chemicals, and extreme temperatures, making it a reliable choice for industrial shoulder bolts in demanding sectors like manufacturing and aerospace.

Specification Summary & Compliance

This shoulder screw adheres to Class 3A thread fit and UNC thread standards for precise dimensional accuracy, with a shoulder diameter tolerance of -0.004" to -0.002" and length tolerance of -0.005" to 0.005". It meets ASME B18.3 manufacturing specifications 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.