S-91518A120 M3 x 10 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 environments
• Exceptional mechanical strength with 70,000 psi tensile strength and Rockwell B70 hardness for reliable, long-term performance
• Secure, non-reversing fastening due to left-hand threading, preventing unintended loosening in rotating machinery
• Efficient installation and removal with 2mm hex drive, providing a positive grip and reducing tool slippage
• Precise, flush mounting with standard 90° countersink angle and flat head design for a smooth, aerodynamic surface
• Consistent thread engagement with Class 6g thread fit and M3x0.5 coarse pitch, ensuring reliable assembly in various materials
• Full regulatory compliance with RoHS 3 and REACH standards, meeting international environmental and safety requirements

Professional Applications & Engineering Value

This M3 left-hand metric flat head screw is engineered to address critical challenges in industrial and mechanical assemblies. Its 18-8 stainless steel material and passivated finish provide excellent resistance to oxidation and chemical exposure, making it suitable for applications in marine, automotive, and food processing equipment where corrosion is a concern. The left-hand thread is specifically designed for use in rotating components—such as machinery shafts or fan assemblies—where standard right-hand threads may loosen under counter-clockwise motion. The hex drive ensures high torque transmission without cam-out, while the fully threaded design offers maximum grip length for secure fastening in thin or variable materials. This combination of features delivers reliable performance, reduces maintenance frequency, and enhances the longevity of your equipment.

Specification Summary & Compliance

This screw features a Metric M3x0.5 coarse thread with a Class 6g thread fit for standard industrial tolerance. It is fully threaded and measures 10mm in length with a 6mm head diameter and 1.7mm head height. Manufacturing and material standards are upheld to ensure dimensional accuracy. The product is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, confirming its adherence to environmental and safety protocols for global industrial use.