S-97832A191 4-40 Shoulder Screws

Key Features & Benefits at a Glance

• Exceptional Corrosion Resistance: Crafted from 18-8 Stainless Steel for reliable performance in demanding environments, reducing maintenance and replacement costs.
• Precision Alignment & Secure Fit: Features a 1-1/2" precision shoulder with tight tolerances for accurate component location and reduced assembly vibration.
• Superior Thread Reliability: Class 3A thread fit ensures consistent, high-strength engagements, minimizing the risk of cross-threading and thread failure.
• High Mechanical Strength: With a tensile strength of 70,000 psi and shear strength of 35,000 psi, it provides robust fastening for high-stress applications.
• Enhanced Grip & Easy Installation: The knurled socket head allows for secure tool engagement and easier manual handling during assembly.
• Broad Industry Compliance: Meets RoHS 3 and REACH regulations, ensuring environmental safety and suitability for global markets.
• Durable & Long-Lasting: Rockwell B55 hardness offers excellent wear resistance, extending the service life of the fastener.

Professional Applications & Engineering Value

This 4-40 UNC shoulder screw is engineered to solve critical alignment and durability challenges in industrial assemblies. The 18-8 Stainless Steel construction provides excellent corrosion resistance, making it ideal for machinery, electronics, and automotive components exposed to harsh conditions. The precise 1-1/2" shoulder length acts as a dependable axle or pivot, ensuring components like gears and bearings remain perfectly aligned, which reduces wear and improves operational accuracy. The Class 3A thread fit and coarse UNC thread facilitate quick, secure fastening, while the knurled socket head enhances grip for efficient installation and maintenance. Its high tensile and shear strength guarantees reliability in dynamic applications, from precision instruments to conveyor systems, delivering long-term performance and reducing downtime.

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 1-1/2" (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 use in regulated industries.