S-97760A441 M8 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

• Exceptional load-bearing capacity with Class 8.8 strength rating and 110,000 psi tensile strength for reliable performance in demanding applications
• Superior corrosion resistance and durability through high-quality steel construction and Rockwell C21 hardness rating
• Secure anti-loosening performance with left-hand thread direction ideal for counter-rotational applications
• Easy installation and removal with external hex drive design providing excellent torque transmission
• Consistent thread engagement through Class 6g thread fit and coarse 1.25mm pitch for quick assembly
• Full-length threading ensures maximum grip and distribution of clamping forces along the entire 40mm length
• Compliance with international standards including ASME B18.2.3.1M and ISO 898-1 for guaranteed quality and interchangeability

Professional Applications & Engineering Value

This M8 left-hand hex head screw delivers critical engineering solutions for applications requiring counter-clockwise tightening security. The Class 8.8 steel construction provides reliable strength where vibration-induced loosening is a concern, making it ideal for rotating machinery, conveyor systems, and equipment with reverse-thread requirements. The coarse 1.25mm pitch metric thread ensures rapid assembly while maintaining secure fastening, and the external hex drive allows for high-torque installation with standard tools. Fully threaded along its 40mm length, this left-hand thread fastener offers maximum thread engagement for superior load distribution in industrial assemblies, manufacturing equipment, and mechanical systems where conventional right-hand threads would unscrew under operational forces.

Specification Summary & Compliance

This metric fastener features precise Class 6g thread fit tolerances and M8 x 1.25mm coarse thread spacing with left-hand direction. Manufactured to ASME B18.2.3.1M and ISO 898-1 specifications, it ensures dimensional accuracy and mechanical performance. The product is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations, making it suitable for global industrial applications requiring strict material restrictions.