S-97760A931 M12 x 25 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 in demanding applications, reducing the risk of fastener failure.
• Left-hand threading provides secure fastening in applications where standard right-hand threads may loosen due to rotational forces.
• Zinc-plated finish offers excellent corrosion resistance, extending the service life of the fastener in various industrial environments.
• Class 8.8 strength grade and Rockwell C21 hardness deliver superior durability and resistance to wear under heavy loads.
• Coarse 1.75mm pitch thread allows for quicker installation and better performance in materials prone to stripping or vibration.
• Fully threaded design ensures maximum grip and holding power along the entire 25mm length for consistent clamping force.
• External hex drive with 19mm head width facilitates easy installation and removal using standard tools, improving assembly efficiency.

Professional Applications & Engineering Value

This M12 hex head screw is engineered to address critical industrial fastening challenges where left-hand threading is essential for safety and reliability. The Class 8.8 steel construction and Rockwell C21 hardness provide exceptional resistance to shear and tensile stresses, making it ideal for heavy machinery, automotive assemblies, and equipment subjected to counter-clockwise rotational forces. The coarse metric thread with 1.75mm pitch ensures secure engagement in soft materials or components prone to vibration loosening, while the zinc-plated finish protects against corrosion in harsh environments. Fully threaded for maximum load distribution, this industrial hex screw delivers consistent performance in applications requiring high-strength fastening solutions that comply with international standards.

Specification Summary & Compliance

This fastener features M12 x 1.75mm coarse thread with Class 6h thread fit for precise dimensional accuracy. It meets ASME B18.2.3.1M and ISO 898-1 specifications, ensuring compliance with international engineering standards for mechanical properties and dimensional requirements. The 25mm length and fully threaded design provide consistent performance, while the manufacturing process adheres to quality controls for reliable industrial use.