S-97760A934 M12 x 40 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 corrosion resistance with zinc-plated finish for extended service life in harsh industrial environments
• Exceptional tensile strength of 110,000 psi ensures reliable performance under high-stress applications
• Left-hand threading provides secure fastening in specialized applications where reverse rotation is required
• Full threading design offers maximum grip length and superior load distribution across the entire fastener
• Coarse 1.75mm pitch enables quick installation and reduced cross-threading risks in assembly operations
• Class 8.8 strength grade delivers proven mechanical performance for critical industrial applications
• External hex drive allows for high-torque installation with standard tools and easy maintenance access

Professional Applications & Engineering Value

This M12 left-hand hex head screw delivers critical engineering solutions where standard right-hand fasteners would compromise safety and functionality. The Class 8.8 steel construction with Rockwell C21 hardness provides optimal balance between strength and ductility, preventing brittle failure in high-vibration environments. The coarse metric thread with 1.75mm pitch ensures rapid assembly in manufacturing lines while maintaining secure connections in equipment subject to reverse rotational forces. The zinc-plated finish offers essential corrosion protection for machinery, conveyor systems, and outdoor installations where moisture and chemical exposure are concerns. These fully threaded fasteners are engineered for applications requiring consistent clamping force across the entire engagement length, making them ideal for heavy machinery, automotive assemblies, and specialized industrial equipment where left-hand threading is specified for safety-critical connections.

Specification Summary & Compliance

This metric hex head screw features precise M12 x 1.75mm coarse threading with Class 6h thread fit tolerance for consistent engagement. Manufactured to ASME B18.2.3M and ISO 898-1 standards, ensuring dimensional accuracy and mechanical properties compliance. The fastener maintains Class 8.8 strength grade with verified tensile strength of 110,000 psi and Rockwell C21 hardness. Complete with 40mm length, 19mm hex head width, and 7.5mm head height for standardized tool compatibility. Meets industry requirements for quality assurance in industrial fastener applications.