S-97832A186 4-40 Shoulder Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance with 18-8 Stainless Steel construction, ideal for harsh industrial environments.
• High-strength performance offering 70,000 psi tensile strength and 35,000 psi minimum shear strength for reliable load-bearing applications.
• Precise Class 3A thread fit ensures tight tolerances and secure fastening in critical assemblies.
• Easy installation and removal with a 5/64" hex drive and knurled head for enhanced grip and torque application.
• Durable shoulder design with controlled diameters and lengths for accurate component alignment and spacing.
• Compliance with environmental standards including RoHS 3 and REACH, supporting sustainable manufacturing practices.
• Coarse UNC thread provides quick assembly and reduced cross-threading risks in high-vibration settings.

Professional Applications & Engineering Value

This 4-40 UNC shoulder screw is engineered to address common industrial challenges such as misalignment and component wear. The 18-8 Stainless Steel material offers excellent resistance to rust and corrosion, making it suitable for applications in machinery, electronics, and automotive systems where exposure to moisture or chemicals is a concern. The Class 3A thread fit and precise shoulder dimensions ensure consistent positioning and reduced play, which is critical in precision assemblies like rotating shafts, bearings, and linkages. The socket head with knurled texture allows for secure tool engagement, minimizing slippage during installation. By combining high tensile and shear strength with a coarse thread design, this screw enhances assembly speed and reliability in demanding environments, reducing maintenance needs and downtime.

Specification Summary & Compliance

This shoulder screw adheres to UNC thread standards with a Class 3A thread fit for high precision. Dimensions include a thread diameter of 0.112", thread length of 5/32", shoulder diameter of 1/8" (tolerance: -0.004" to -0.002"), and shoulder length of 7/32" (tolerance: -0.005" to 0.005"). It meets RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) compliance, ensuring it is free from hazardous substances and suitable for global industrial use.