S-91180A916 M18 x 40 mm ISO 8676, DIN 961 Medium-Strength Metric Class 8.8 Steel Hex Head Screws

Key Features & Benefits at a Glance

• Exceptional load-bearing capacity with 110,000 psi tensile strength for reliable performance in demanding applications
• Superior corrosion resistance through zinc plating, extending service life in harsh industrial environments
• Precision thread engagement with Class 6h fit and fine 1.5mm pitch ensuring secure, vibration-resistant connections
• Optimized torque transmission via external hex drive and 27mm head width for efficient installation and removal
• Consistent mechanical properties with Rockwell C21 hardness and Class 8.8 strength grade for predictable performance
• Full-threaded design providing maximum grip length and uniform stress distribution along the entire 40mm length
• Regulatory compliance assurance meeting international standards for quality and environmental safety

Professional Applications & Engineering Value

Engineered for heavy-duty industrial applications, these M18 hex head screws deliver exceptional performance where reliability is paramount. The Class 8.8 steel construction provides the necessary strength for structural connections, machinery assembly, and equipment manufacturing. The fine 1.5mm thread pitch offers superior resistance to vibration loosening compared to coarse threads, making them ideal for dynamic load conditions. Zinc plating creates a protective barrier against corrosion, significantly extending service life in environments exposed to moisture or chemicals. The external hex drive design allows for high torque application during installation, ensuring secure fastening in critical joints while the fully threaded configuration maximizes clamping force distribution across the entire 40mm length.

Specification Summary & Compliance

This metric hex head screw features M18 x 1.5mm fine thread spacing with Class 6h thread fit precision according to ISO standards. Manufacturing complies with ISO 8676/DIN 961 specifications for dimensional accuracy and mechanical properties. The fastener meets RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations, ensuring compliance with international substance restrictions. The Class 8.8 strength grade corresponds to minimum tensile strength of 110,000 psi with Rockwell C21 hardness, providing consistent performance across industrial applications.