S-92981A307 M8 ISO 7379 Shoulder Screws

Key Features & Benefits at a Glance

• Exceptional Durability – Made from high-strength alloy steel with a black oxide finish for superior corrosion resistance and long service life in demanding environments.
• Precision Fit & Alignment – Features a consistent shoulder diameter with tight tolerance (-0.072 to -0.01 mm) to ensure accurate component positioning and reduced assembly play.
• High Load Capacity – Offers a tensile strength of 140,000 psi and minimum shear strength of 84,000 psi for reliable performance under heavy mechanical stress.
• Easy Installation & Removal – Hex socket drive (5 mm) allows for secure tool engagement and efficient fastening in confined spaces.
• Industry Standard Compliance – Manufactured to ISO 7379 specifications with Class 5g6g thread fit, ensuring interchangeability and consistent quality.
• Environmental & Safety Assurance – Complies with RoHS 3 and REACH regulations, making it suitable for use in regulated industries and export markets.
• Optimized for Coarse Thread Applications – M8x1.25 right-hand coarse thread enables quick assembly and high resistance to vibration loosening.

Professional Applications & Engineering Value

This M8 shoulder screw is engineered to address critical alignment and load-bearing challenges in industrial assemblies. The alloy steel construction, combined with a black oxide finish, provides excellent wear resistance and protection against rust, making it ideal for machinery, automotive, and precision equipment where exposure to oils and moisture is common. The 50 mm shoulder length acts as a precise pivot or spacer, eliminating the need for additional bushings and reducing component count. With its hex socket drive and coarse pitch thread, it ensures rapid installation and secure fastening in high-vibration environments, enhancing assembly efficiency and reducing maintenance downtime. This screw is a trusted solution for applications requiring reliable shoulder diameter tolerance and consistent performance under dynamic loads.

Specification Summary & Compliance

The screw adheres to ISO 7379 standards, with a Class 5g6g thread fit ensuring precise thread engagement and dimensional accuracy. The shoulder diameter tolerance is tightly controlled at -0.072 to -0.01 mm, and the shoulder length tolerance is 0 to 0.25 mm for reliable fit in precision assemblies. It is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006), meeting environmental and safety requirements for global industrial use.