S-91319A222 M8 ISO 7379 Shoulder Screws

Key Features & Benefits at a Glance

• Vibration-resistant locking with integrated nylon pellet ensures secure fastening in high-stress applications, preventing loosening under dynamic loads.
• Exceptional mechanical strength from alloy steel construction provides 150,000 psi tensile and 84,000 psi shear strength for heavy-duty industrial use.
• Corrosion-resistant black oxide finish enhances durability and provides a protective layer against wear and environmental exposure.
• Precision shoulder positioning with a 10mm diameter and 35mm length allows for accurate component alignment and rotational bearing surfaces.
• Reliable thread engagement with Class 5g6g fit and coarse M8x1.25mm thread ensures easy assembly and consistent performance in metric systems.
• Secure hex socket drive with 5mm key size and knurled head offers superior torque transmission and slip-resistant handling during installation.
• Wide temperature tolerance from -50° to 250°F maintains locking integrity and mechanical properties in varied operating environments.

Professional Applications & Engineering Value

This M8 shoulder screw is engineered to address critical alignment and vibration challenges in precision machinery. The alloy steel core, hardened to Rockwell C32, delivers high fatigue resistance, making it ideal for rotating assemblies, linkages, and pivoting mechanisms where shoulder diameter and length must maintain tight tolerances. The integrated nylon pellet thread locker secures fasteners in high-vibration environments like automotive drivetrains, robotics, and conveyor systems, eliminating the need for separate locking washers or adhesives. With its coarse metric thread and black oxide finish, it ensures quick installation and extended service life in industrial settings, reducing maintenance downtime and improving assembly reliability.

Specification Summary & Compliance

This shoulder screw adheres to ISO 7379 dimensional standards, with a Class 5g6g thread fit for precise tolerance. The shoulder diameter tolerance is -0.049 to -0.01 mm, and shoulder length tolerance is 0 to 0.25 mm, ensuring consistent alignment. It is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations, supporting sustainable manufacturing practices.