S-97760A421 M8 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

• Exceptional tensile strength of 110,000 psi ensures reliable performance under high-stress conditions
• Left-hand thread design provides secure fastening in applications where standard right-hand threads may loosen
• Class 8.8 strength grade delivers superior mechanical properties for demanding industrial environments
• Coarse thread pitch enables faster installation and reduced cross-threading risk
• Fully threaded design offers maximum grip length and uniform load distribution
• External hex drive allows for high-torque application with standard tools
• Rockwell C21 hardness provides excellent wear resistance and durability

Professional Applications & Engineering Value

This M8 left-hand hex head screw addresses critical engineering challenges in applications where reverse rotation or vibration could cause conventional fasteners to loosen. The Class 8.8 steel construction combined with coarse metric threading delivers exceptional holding power in machinery, automotive systems, and industrial equipment requiring left-hand threaded fasteners. The external hex drive facilitates high-torque installation while the fully threaded design ensures maximum engagement in various material thicknesses. Engineered to prevent accidental disassembly in rotating systems, this high-strength screw provides reliable performance where safety and security are paramount.

Specification Summary & Compliance

Manufactured to precise Class 6g thread fit tolerance standards with M8 x 1.25mm coarse thread specifications. This fastener meets ASME B18.2.3M and ISO 898-1 manufacturing standards, ensuring dimensional accuracy and mechanical performance. Fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations, making it suitable for global industrial applications requiring certified components.