S-90605A341 M12 x 40 mm DIN 912, ISO 4762 Left-Hand Threaded Alloy Steel Socket Head Screws

Key Features & Benefits at a Glance

• Superior tensile strength with Class 12.9 rating (170,000 PSI) ensures reliable performance under extreme loads, reducing the risk of fastener failure in demanding applications.
• Enhanced corrosion resistance from the black-oxide coating prolongs service life in harsh environments, minimizing maintenance needs and replacement costs.
• Precise left-hand threading (M12 x 1.75mm coarse) provides secure fastening in specialized assemblies where reverse rotation is required, preventing accidental loosening.
• High hardness (Rockwell C37) offers excellent wear resistance, maintaining thread integrity and drive engagement over repeated use.
• Optimized partially threaded design with 36mm minimum thread length allows for focused clamping force and easier alignment in precision components.
• Standard hex socket drive (10mm) enables efficient installation with common tools, reducing assembly time and improving workplace productivity.
• Compliance with international standards including DIN 912/ISO 4762 ensures dimensional accuracy and interchangeability, supporting global supply chain requirements.

Professional Applications & Engineering Value

This M12 left-hand socket head cap screw is engineered to address critical challenges in industrial and mechanical systems where reverse-thread fastening is essential for safety and functionality. The black-oxide alloy steel construction provides a durable barrier against oxidation and wear, making it ideal for automotive, machinery, and heavy equipment applications exposed to moisture or chemicals. With its Class 12.9 high tensile strength and coarse thread pitch, it delivers robust clamping force and vibration resistance, preventing unintentional loosening in dynamic environments. The partially threaded configuration ensures precise load distribution, reducing stress concentrations and enhancing joint reliability. By integrating metric coarse threading and a standardized hex drive, it streamlines maintenance and assembly processes, offering long-term value in precision engineering projects.

Specification Summary & Compliance

This fastener adheres to Class 5g6g thread fit tolerances per ISO metric standards, ensuring consistent thread engagement and assembly accuracy. It conforms to DIN 912 / ISO 4762 specifications for dimensional and mechanical properties, guaranteeing reliability in industrial use. The product is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, supporting environmentally responsible manufacturing and supply chain practices.