S-97832A195 4-40 Shoulder Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance with 18-8 Stainless Steel construction for long-lasting performance in harsh environments.
• Precise alignment and spacing ensured by the consistent 1/8" shoulder diameter and 2-1/2" shoulder length, reducing assembly errors.
• High-strength reliability with a tensile strength of 70,000 psi and shear strength of 35,000 psi for demanding mechanical applications.
• Secure, non-slip installation thanks to the knurled socket head and 5/64" hex drive, providing excellent torque transfer.
• Accurate and durable thread engagement from the Class 3A UNC coarse thread fit, ensuring vibration resistance and easy assembly.
• Consistent dimensional stability with tight shoulder tolerances for reliable performance in precision assemblies.
• Compliance with global environmental standards including RoHS 3 and REACH, making it suitable for regulated industries.

Professional Applications & Engineering Value

This 4-40 UNC shoulder screw is engineered to address critical alignment and pivot point requirements in industrial machinery, automation systems, and precision instruments. The 18-8 Stainless Steel material offers excellent resistance to corrosion and oxidation, which is vital for applications in humid or chemically aggressive environments. The Class 3A thread fit and coarse UNC thread provide robust, vibration-resistant fastening, reducing the risk of loosening under dynamic loads. The knurled socket head with a 5/64" hex drive ensures secure tool engagement, preventing cam-out during high-torque installation. This combination of a precise 1/8" shoulder diameter and extended 2-1/2" shoulder length allows for accurate component positioning, making it ideal for use in linkages, bearings, and rotating assemblies where exact spacing is crucial for operational efficiency and longevity.

Specification Summary & Compliance

This shoulder screw adheres to UNC thread standards with a Class 3A thread fit for high precision. Dimensional tolerances include a shoulder diameter of -0.004" to -0.002" and shoulder length of -0.005" to 0.005", ensuring consistent performance. It is manufactured from 18-8 Stainless Steel with a hardness of Rockwell B55 and meets RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) compliance for environmental safety.