S-90807A122 5/16"-18 Shoulder Screws

Key Features & Benefits at a Glance

• Exceptional Tensile Strength: With 140,000 psi tensile strength, this shoulder screw handles high-stress applications without failure, ensuring long-term reliability in demanding environments.
• Superior Corrosion Resistance: The black oxide finish provides a durable protective layer, reducing wear and extending service life in humid or corrosive industrial settings.
• Precise Thread Fit: Class 3A thread fit guarantees tight tolerances and secure fastening, minimizing vibration loosening and improving assembly accuracy.
• Enhanced Grip and Control: The knurled socket head design offers improved torque application and slip resistance, allowing for easier installation and maintenance with standard hex tools.
• High Material Hardness: Rockwell C32 hardness ensures the screw maintains its shape and thread integrity under heavy loads, reducing deformation risks.
• Regulatory Compliance: Meets RoHS 3 and REACH standards, making it safe for use in various industries without environmental or health concerns.
• Optimized Shoulder Dimensions: Consistent shoulder diameter and length tolerances provide stable alignment and spacing in machinery, enhancing operational efficiency.

Professional Applications & Engineering Value

This 5/16"-18 UNC shoulder screw is engineered to address critical challenges in industrial assembly, such as misalignment and component wear. Made from alloy steel with a black oxide finish, it combats corrosion while offering high tensile strength for heavy-duty applications like automotive systems, robotics, and precision machinery. The Class 3A thread fit and knurled socket head ensure secure, vibration-resistant connections, reducing maintenance downtime. Its right-hand coarse threads facilitate quick installation, making it ideal for high-volume production lines where reliability and compliance with RoHS and REACH are paramount for safety and performance.

Specification Summary & Compliance

This shoulder screw adheres to UNC thread standards with a Class 3A thread fit for precise engagement, and features a shoulder diameter tolerance of -0.004" to -0.002" and length tolerance of -0.005" to 0.005" for consistent performance. Manufactured in compliance with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006), it meets stringent environmental and safety regulations, ensuring suitability for global industrial use without hazardous substances.