S-90605A342 M12 x 50 mm DIN 912, ISO 4762 Left-Hand Threaded Alloy Steel Socket Head Screws

Key Features & Benefits at a Glance

• Exceptional tensile strength of 170,000 psi from Class 12.9 alloy steel ensures reliable performance in high-stress industrial applications.
• Enhanced corrosion resistance with black-oxide coating prolongs service life in harsh or humid environments.
• Secure and precise installation using a 10 mm hex drive and standard socket head profile for reduced cam-out and consistent torque application.
• Left-hand thread design provides specialized functionality for applications requiring reverse-threading to prevent loosening under counter-clockwise rotation.
• Coarse 1.75 mm thread pitch allows for quicker assembly and better grip in softer materials or where vibration is a concern.
• Partially threaded shank offers improved clamping force and alignment in precision assemblies.
• High hardness (Rockwell C37) resists wear and deformation, maintaining fastener integrity over repeated use.

Professional Applications & Engineering Value

Engineered for demanding environments, this M12 left-hand thread socket head cap screw addresses critical challenges in machinery, automotive, and heavy equipment sectors. The Class 12.9 alloy steel construction provides a robust solution for high-vibration applications, where standard fasteners may fail. The black-oxide surface treatment not only enhances corrosion resistance but also reduces galling during installation. With a coarse metric thread and 10 mm hex drive, it ensures efficient assembly in tight spaces, while the left-hand threading is ideal for specific components like rotating shafts or counter-threaded joints, preventing unintended loosening. This partially threaded design concentrates clamping force precisely where needed, reducing stress concentrations and improving joint reliability in structural and mechanical systems.

Specification Summary & Compliance

This screw adheres to DIN 912 / ISO 4762 standards, with a Class 5g6g thread fit ensuring dimensional accuracy and interchangeability. It is manufactured to meet RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) compliance, confirming it is free of hazardous substances. The metric coarse thread (M12 x 1.75 mm) and 50 mm length with a 36 mm minimum thread length provide consistent performance across industrial applications, backed by the high-strength properties of Class 12.9 alloy steel.