S-97832A189 4-40 Shoulder Screws

Key Features & Benefits at a Glance

• Exceptional Corrosion Resistance: Crafted from 18-8 Stainless Steel for long-lasting performance in harsh industrial environments.
• High Tensile & Shear Strength: Withstands up to 70,000 psi tensile and 35,000 psi shear loads, ensuring reliable fastening under stress.
• Precision Thread Fit: Class 3A thread fit guarantees tight, secure connections with minimal backlash for vibration-resistant assemblies.
• Secure & Easy Installation: Hex socket drive with a 5/64" key size and knurled head texture provides superior grip and prevents tool slippage.
• Accurate Shoulder Alignment: The 7/8" shoulder length with tight tolerances ensures precise component positioning and smooth rotational movement.
• Broad Industrial Compliance: Meets RoHS 3 and REACH standards, making it suitable for global supply chains and sensitive applications.
• Durable Material Hardness: Rockwell B55 hardness offers excellent wear resistance, maintaining thread integrity through repeated use.

Professional Applications & Engineering Value

This 4-40 UNC thread shoulder screw is engineered to solve critical alignment and durability challenges in precision machinery. The 18-8 Stainless Steel construction provides superior corrosion resistance, ideal for applications in manufacturing equipment, automation systems, and electronic enclosures exposed to moisture or chemicals. The coarse UNC thread and Class 3A fit ensure quick assembly and a secure hold, reducing the risk of loosening under vibration. The 7/8" shoulder length acts as a precise axle or pivot, maintaining exact part spacing in linkages, bearings, and gears. With a hex socket head and knurled texture, installation is straightforward, even in confined spaces, enhancing maintenance efficiency. This screw delivers reliable performance in robotics, conveyor systems, and precision instruments where high tensile strength and dimensional accuracy are non-negotiable.

Specification Summary & Compliance

This shoulder screw adheres to UNC thread standards with a Class 3A thread fit for high precision. Key dimensional tolerances include a shoulder diameter of 1/8" (tolerance: -0.004" to -0.002") and shoulder length of 7/8" (tolerance: -0.005" to 0.005"). It is manufactured to meet RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) compliance, ensuring it is free from hazardous substances and suitable for industrial and electronic applications globally.