S-92981A159 M20 ISO 7379 Shoulder Screws

Key Features & Benefits at a Glance

• Enhanced Durability & Corrosion Resistance – Black oxide finish on alloy steel provides reliable protection against rust, extending service life in demanding industrial environments.
• High Tensile & Shear Strength – With 140,000 psi tensile and 84,000 psi minimum shear strength, this screw withstands heavy loads and mechanical stress without failure.
• Precision Shoulder for Accurate Alignment – The 24mm shoulder diameter with tight tolerance (-0.072 to -0.01 mm) ensures exact positioning and smooth rotation in assemblies.
• Secure Hex Drive Installation – 12mm hex socket drive allows for high torque application, reducing the risk of stripping and ensuring firm fastening.
• Consistent Thread Performance – M20x2.5 coarse thread with Class 5g6g fit offers reliable engagement and vibration resistance in high-stress applications.
• Compliance with International Standards – Meets ISO 7379 specifications and is RoHS 3 and REACH compliant, ensuring safety and regulatory acceptance worldwide.
• Optimized for Heavy-Duty Use – Rockwell C32 hardness and robust shoulder length (45mm) provide stability and wear resistance in machinery and automation systems.

Professional Applications & Engineering Value

This M20x2.5 shoulder screw is engineered to address critical alignment and load-bearing challenges in precision assemblies. The alloy steel construction, combined with a black oxide finish, resists corrosion and wear, making it ideal for automotive, robotics, and industrial machinery where exposure to oils and moisture is common. The 24mm shoulder diameter with tight tolerance ensures components rotate or pivot smoothly without misalignment, reducing maintenance needs. The socket head design with 12mm hex drive facilitates easy installation in confined spaces, while the coarse metric thread and Class 5g6g fit maintain secure fastening under dynamic loads. By integrating high tensile strength and compliance with ISO 7379, this screw enhances reliability in cam followers, bearing mounts, and linkage systems, minimizing downtime and improving operational efficiency.

Specification Summary & Compliance

This shoulder screw adheres to ISO 7379 standards, with precise dimensional controls including a shoulder diameter tolerance of -0.072 to -0.01 mm and shoulder length tolerance of 0 to 0.25 mm. The thread fit Class 5g6g ensures consistent engagement for metric coarse threads (M20x2.5). It is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, confirming the absence of hazardous substances. Manufactured from alloy steel with a black oxide finish, it meets specified mechanical properties such as Rockwell C32 hardness and 140,000 psi tensile strength, supporting use in regulated and high-performance industrial applications.