S-97345A300 4-40 Shoulder Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance with 316 stainless steel construction, ideal for harsh industrial environments and outdoor applications.
• High-strength performance offering 70,000 psi tensile and 35,000 psi shear strength for reliable, long-lasting fastening under stress.
• Precise Class 3A thread fit ensures tight tolerances and secure assembly, reducing the risk of loosening in critical applications.
• Extended 3-inch shoulder length provides stable alignment and spacing for rotating parts like gears and pulleys.
• Easy installation and removal with a 5/64" hex socket drive and knurled head for improved grip and torque application.
• Durable Rockwell B79 hardness maintains structural integrity and resists wear in high-motion assemblies.
• Compliance with RoHS 3 and REACH regulations ensures environmental safety and suitability for global industrial markets.

Professional Applications & Engineering Value

This 316 stainless steel shoulder screw is engineered to address common challenges in precision machinery, such as misalignment and corrosion-induced failure. Its 4-40 UNC coarse thread and Class 3A fit provide secure fastening with minimal backlash, essential for assemblies requiring repeatable accuracy. The 3-inch shoulder length acts as a stable axle or pivot, supporting rotating components in automation equipment, conveyor systems, and electronic enclosures. Made from corrosion-resistant 316 stainless steel, it withstands exposure to chemicals, moisture, and temperature variations, reducing maintenance needs. The knurled head and hex socket drive facilitate quick installation in tight spaces, enhancing efficiency in production lines and repair operations.

Specification Summary & Compliance

This shoulder screw features a 4-40 UNC thread with Class 3A precision fit, ensuring tight dimensional control per standard specifications. The shoulder diameter is 1/8" with a tolerance of -0.004" to -0.002", and the shoulder length is 3" with a tolerance of -0.005" to 0.005" for consistent performance. It complies with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, confirming its suitability for environmentally conscious industrial applications.