S-97760A831 M12 x 30 mm ASME B18.2.3.1M, ISO 898-1 Left-Hand Threaded Medium-Strength Metric Class 8.8 Steel Hex Head Screws

Key Features & Benefits at a Glance

• Superior tensile strength with Class 8.8 rating (110,000 psi) for reliable performance in high-stress industrial environments
• Exceptional hardness at Rockwell C21 ensures excellent wear resistance and extended service life
• Left-hand threading provides secure fastening in applications where standard right-hand threads would loosen under rotational forces
• Coarse 1.75mm pitch enables quicker installation and better resistance to vibration-induced loosening
• External hex drive design allows for high torque application with standard tools and easy access in confined spaces
• Full threading along 30mm length ensures maximum grip strength and uniform load distribution
• Environmental compliance with RoHS 3 and REACH regulations makes these screws suitable for regulated industries

Professional Applications & Engineering Value

This M12 left-hand hex head screw delivers critical engineering solutions where reverse-thread applications prevent mechanical loosening in rotating equipment. The Class 8.8 steel construction provides optimal strength-to-weight ratio for heavy-duty machinery, automotive assemblies, and industrial equipment subjected to constant vibration and dynamic loads. With coarse metric threading (1.75mm pitch) and Class 6g thread fit, these fasteners maintain precise engagement while resisting cross-threading during installation. The external hex drive combined with 19mm head width enables high-torque tightening without stripping, making them ideal for maintenance applications where accessibility is limited. These left-hand threaded screws are specifically engineered for counter-rotational systems, conveyor mechanisms, and specialized machinery where standard right-hand threads would compromise safety and performance.

Specification Summary & Compliance

This metric hex head screw features M12 x 1.75mm coarse threading with Class 6g thread tolerance for precise fitment. Manufactured to ISO 898-1 and ASME B18.2.3.1M standards, ensuring dimensional accuracy and mechanical properties. Fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations. The 30mm length provides versatile application coverage while maintaining structural integrity across the fully threaded shank.