S-91029A104 M8 x 25 mm ISO 4017, DIN 933 Extreme-Strength Metric Class12.9 Steel Hex Head Screws

Key Features & Benefits at a Glance

• Maximum Load Capacity: Class 12.9 strength rating with 170,000 PSI tensile strength ensures reliable performance in high-stress industrial applications
• Superior Corrosion Protection: Zinc yellow-chromate plating provides excellent resistance against rust and environmental degradation
• Optimized Thread Design: M8 coarse pitch (1.25mm) with Class 6h thread fit delivers secure fastening and vibration resistance
• Enhanced Durability: Rockwell C39 hardness maintains structural integrity under repeated stress and heavy loads
• Industry Standard Compliance: Meets ISO 4017/DIN 933 specifications for consistent quality and international compatibility
• Efficient Installation: External hex drive with 13mm head width allows for quick installation using standard tools
• Full Thread Engagement: 25mm fully threaded design provides maximum grip strength across the entire fastener length

Professional Applications & Engineering Value

This M8 hex head screw delivers exceptional engineering value in demanding industrial environments where failure is not an option. The Class 12.9 steel construction, combined with Rockwell C39 hardness, provides the structural integrity needed for heavy machinery, automotive assemblies, and construction equipment. The zinc yellow-chromate plating addresses corrosion concerns in harsh environments, while the coarse thread pitch ensures reliable performance in vibration-prone applications. The fully threaded metric design with external hex drive enables rapid installation and consistent clamping force, making it ideal for production lines where efficiency and reliability are critical. Engineered to ISO 4017 standards, this fastener meets the rigorous demands of industrial manufacturing and maintenance operations.

Specification Summary & Compliance

This high-strength hex head screw features precise M8 x 1.25mm coarse thread with Class 6h thread fit tolerance for optimal engagement. The fastener complies with ISO 4017/DIN 933 specifications for dimensional accuracy and manufacturing consistency. With a length of 25mm and fully threaded design, it maintains Class 12.9 strength classification throughout its entire structure. The zinc yellow-chromate finish provides corrosion protection while meeting industry standards for surface treatments. Manufactured to international metric standards, this screw ensures compatibility with global engineering specifications and industrial applications.