S-97345A197 4-40 Shoulder Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance with 316 stainless steel construction, ideal for harsh industrial and marine environments.
• Exceptional mechanical strength offering 70,000 psi tensile and 35,000 psi shear strength for reliable, high-stress applications.
• Precise Class 3A thread fit ensures secure, vibration-resistant assemblies with minimal backlash.
• Knurled socket head with 5/64" hex drive provides superior grip and torque transmission, reducing tool slippage.
• Coarse UNC threads enable faster installation and are less prone to clogging in demanding conditions.
• Full compliance with RoHS 3 and REACH meets stringent environmental regulations for global supply chains.
• Durable Rockwell B79 hardness maintains thread integrity and shoulder dimensions under repeated use.

Professional Applications & Engineering Value

This 316 stainless steel shoulder screw is engineered to solve critical alignment and pivot point challenges in precision assemblies. The 4-40 UNC coarse thread and Class 3A fit provide a secure, repeatable fastening solution that resists loosening under vibration, making it ideal for machinery, robotics, and electronic enclosures. The knurled socket head enhances grip during installation, while the precise shoulder diameter and length act as a reliable spacer or bearing surface. Its high tensile and shear strength ensures long-term performance in corrosive or high-load environments, reducing maintenance downtime and replacement costs.

Specification Summary & Compliance

This shoulder screw features a 4-40 UNC thread with Class 3A fit for high precision, a shoulder diameter of 1/8" with tolerance of -0.004" to -0.002", and a shoulder length of 1 1/8" with tolerance of -0.005" to 0.005". It is manufactured to meet RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) compliance standards, ensuring environmental safety and regulatory acceptance for industrial use.