S-97760A641 M10 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 strength for demanding applications – Class 8.8 steel construction provides 110,000 psi tensile strength and Rockwell C21 hardness for reliable performance under high stress.
• Left-hand threading for specialized assemblies – Designed for applications requiring reverse-threading to prevent loosening from standard rotational forces.
• Full-thread engagement for maximum grip – Fully threaded design ensures consistent holding power along the entire 40mm length.
• Coarse pitch for quick assembly and debris resistance – 1.5mm coarse thread pitch enables faster installation and better performance in dirty or high-vibration environments.
• Precision thread fit for secure fastening – Class 6g thread tolerance ensures consistent, reliable engagement with mating components.
• External hex drive for high-torque applications – 17mm hex head allows for secure tool engagement and efficient installation with standard wrenches.
• Compliance with international standards – Meets ASME B18.2.3.1M and ISO 898-1 specifications for guaranteed dimensional accuracy and performance reliability.

Professional Applications & Engineering Value

This M10 left-hand hex head screw addresses critical engineering challenges in industrial applications where reverse-threading is essential for safety and functionality. The Class 8.8 steel construction provides exceptional durability in high-stress environments, while the coarse thread pitch (1.5mm) ensures reliable performance in vibrating machinery and equipment where fine threads might loosen. The fully threaded design offers consistent clamping force across the entire 40mm length, making it ideal for heavy-duty assemblies in manufacturing, automotive, and machinery sectors. With external hex drive compatibility, installation and maintenance are streamlined using standard tools, reducing downtime in production environments.

Specification Summary & Compliance

This fastener maintains Class 6g thread fit tolerance per metric standards and complies with ASME B18.2.3.1M and ISO 898-1 manufacturing specifications. Environmental compliance includes RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) standards, ensuring safe use in regulated industries.