S-97760A416 M8 x 16 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

• Exceptional Load-Bearing Capability - Class 8.8 strength grade and 110,000 psi tensile strength ensure reliable performance under high-stress conditions
• Superior Torque Transmission - External hex drive design provides maximum torque application with standard tools
• Reverse-Thread Security - Left-hand thread direction prevents loosening in counter-rotating machinery applications
• Precision Thread Engagement - Class 6g thread fit and coarse 1.25mm pitch enable quick assembly and vibration resistance
• Full-Length Threading - Completely threaded shank allows for maximum adjustment and secure fastening throughout the entire length
• Industrial-Grade Durability - Steel construction with Rockwell C21 hardness provides excellent wear resistance and longevity
• Standardized Compatibility - Metric M8 sizing ensures seamless integration with existing metric system components

Professional Applications & Engineering Value

This left-hand metric hex head screw addresses critical engineering challenges in industrial environments where reverse rotation is present. The Class 8.8 steel construction delivers reliable performance in high-vibration applications, while the external hex drive enables efficient installation in confined spaces. The coarse thread pitch (1.25mm) provides rapid assembly and superior resistance to vibration-induced loosening, making it ideal for machinery, automotive, and manufacturing equipment where counter-clockwise motion occurs. The fully threaded design ensures maximum grip length and adjustment flexibility, while the precise Class 6g thread fit guarantees consistent performance across multiple installations.

Specification Summary & Compliance

This M8 x 1.25mm hex head screw features Class 6g thread fit tolerance and complies with ASME B18.2.3M and ISO 898-1 manufacturing specifications. The fastener meets RoHS 3 (2015/863/EU) compliance for hazardous substance restrictions and REACH (EC 1907/2006) standards for chemical safety. With dimensions of 16mm length, 13mm head width, and 5.3mm head height, this left-hand metric screw maintains precise dimensional accuracy for consistent industrial performance.