S-97760A911 M12 x 50 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 with Class 8.8 rating (110,000 psi) for reliable performance in high-stress applications
• Left-hand thread design provides secure fastening in rotating machinery where standard threads may loosen
• Rockwell C21 hardness ensures superior wear resistance and extended service life under demanding conditions
• Coarse 1.75mm pitch threading enables quick installation and superior grip in various materials
• Fully threaded design offers maximum engagement and clamping force along the entire 50mm length
• External hex drive allows for high-torque installation using standard tools without stripping concerns
• Class 6g thread fit ensures precise mating with nuts and threaded components for vibration-resistant assemblies

Professional Applications & Engineering Value

This M12 left-hand hex head screw addresses critical engineering challenges in industrial environments where reverse-rotation forces are present. The Class 8.8 steel construction provides the necessary strength to withstand vibrational stresses in machinery, conveyor systems, and rotating equipment. The coarse metric thread with 1.75mm pitch ensures reliable performance in softer materials and faster assembly times. With its external hex drive and fully threaded design, this fastener delivers maximum clamping force for heavy-duty applications while resisting loosening under counter-clockwise rotation. The combination of 110,000 psi tensile strength and Rockwell C21 hardness makes it ideal for automotive, manufacturing, and equipment maintenance where durability and reverse-thread security are paramount.

Specification Summary & Compliance

This metric steel hex head screw features precise Class 6g thread fit tolerance and M12 x 1.75mm coarse threading with left-hand direction. Manufactured to ASME B18.2.3.1M and ISO 898-1 specifications, ensuring dimensional accuracy and performance consistency. The fastener is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations, making it suitable for global industrial applications requiring strict material safety standards.