S-97760A221 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 holding power with 110,000 psi tensile strength for reliable performance in high-stress applications
• Exceptional durability thanks to Class 8.8 steel construction and Rockwell C21 hardness for long service life
• Secure anti-loosening performance from left-hand thread design ideal for counter-rotating machinery
• Quick installation and removal with external hex drive and coarse 1mm pitch threading
• Precise fit and compatibility ensured by M6 metric sizing and Class 6g thread fit tolerance
• Full-thread engagement along the 20mm length for maximum grip strength in assemblies
• Regulatory compliance confidence meeting international mechanical and environmental standards

Professional Applications & Engineering Value

This M6 left hand hex head screw provides critical engineering solutions where standard right-hand threads would loosen under specific rotational forces. The Class 8.8 steel construction delivers exceptional fatigue resistance in demanding mechanical systems, while the coarse 1mm pitch metric threading ensures rapid installation in production environments. The external hex drive accommodates standard tools for straightforward maintenance access. Ideal for counter-rotating equipment, conveyor systems, and machinery requiring reverse-thread security, this fully threaded fastener maintains integrity in vibration-intensive industrial applications where back-out prevention is paramount.

Specification Summary & Compliance

Manufactured to precise Class 6g thread fit tolerance with M6x1mm coarse threading and 20mm fully threaded length. Complies with ASME B18.2.3.1M and ISO 898-1 mechanical specifications for dimensional accuracy and performance. Meets RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations for hazardous substance restrictions.