S-97760A915 M6 x 20 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 mechanical strength with Class 8.8 rating and 110,000 psi tensile strength for heavy-duty applications
• Reliable left-hand threading provides secure fastening in specialized machinery and reverse-rotation systems
• Optimized torque transmission through external hex drive design for efficient installation and removal
• Precision metric threading with M6 x 1mm coarse pitch ensures quick assembly and vibration resistance
• Consistent performance guaranteed by Rockwell C21 hardness and Class 6h thread fit tolerances
• Full thread coverage along the 20mm length maximizes grip strength and load distribution

Professional Applications & Engineering Value

Engineered for demanding industrial scenarios, these M6 left-hand thread hex head screws solve critical fastening challenges in machinery requiring reverse-thread security. The Class 8.8 steel construction combined with zinc plating provides exceptional durability against corrosion and mechanical stress, making them ideal for automotive assemblies, conveyor systems, and specialized equipment where standard right-hand threads would loosen under counter-rotational forces. The metric coarse threading ensures rapid installation while maintaining vibration resistance, and the external hex drive facilitates high-torque applications without stripping. These fully threaded fasteners deliver uniform clamping force across the entire 20mm length, preventing joint failure in high-stress environments.

Specification Summary & Compliance

This hex head screw features precise M6 x 1mm left-hand metric coarse threads with Class 6h fit tolerance, ensuring compatibility with standard metric components. Manufactured from steel with Rockwell C21 hardness and 110,000 psi tensile strength, it complies with ASME B18.2.3.1M and ISO 898-1 standards for dimensional accuracy and mechanical properties. The zinc-plated finish meets industry corrosion protection requirements while maintaining RoHS and REACH compliance for environmental safety.