S-91518A170 M6 x 12 mm Left-Hand-Thread Stainless Steel Hex-Drive Flat Head Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance with 18-8 stainless steel construction and passivated finish, ideal for harsh industrial environments
• Enhanced mechanical reliability offering Rockwell B70 hardness and 70,000 psi tensile strength for demanding applications
• Precise left-hand thread engagement with Class 6g fit and coarse 1mm pitch, ensuring secure fastening in reverse-thread scenarios
• Efficient installation and removal via 4mm hex drive, compatible with standard tools for reduced assembly time
• Optimal flush mounting with standard 90° countersink angle and flat head design, minimizing protrusion in finished surfaces
• Full thread coverage across the 12mm length, providing consistent grip strength along the entire fastener
• Compliance with environmental regulations, meeting RoHS 3 and REACH standards for safe, sustainable industrial use

Professional Applications & Engineering Value

This M6 left-hand metric flat head screw is engineered to address critical challenges in machinery requiring reverse-thread security, such as rotating components where standard right-hand threads may loosen under torque. The 18-8 stainless steel material, combined with a passivated finish, delivers exceptional resistance to oxidation and chemical exposure, prolonging service life in humid or corrosive settings like marine equipment, food processing lines, and outdoor assemblies. Its Class 6g thread fit and coarse 1mm pitch ensure rapid, reliable engagement, reducing the risk of cross-threading during installation. The hex drive and flat head profile facilitate easy access in confined spaces, while the 90° countersink allows for seamless integration into angled surfaces, maintaining structural integrity and aesthetic appeal in precision engineering projects.

Specification Summary & Compliance

This fastener adheres to metric threading standards with M6x1mm dimensions, Class 6g thread tolerance for precise fit, and a left-hand thread direction. It complies with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring it is free of hazardous substances and suitable for global industrial applications. The screw is fully threaded, with a 12mm length, 4mm hex drive, and standard flat head profile, manufactured to deliver consistent performance in high-stress environments.