S-90605A256 M8 x 30 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 ensures reliable performance in high-stress applications, reducing the risk of fastener failure.
• Superior corrosion resistance from the black-oxide finish on alloy steel extends service life in harsh or humid environments.
• Left-hand threading provides secure fastening in specialized machinery where reverse rotation is required, preventing unintentional loosening.
• High hardness (Rockwell C37) offers excellent wear resistance, maintaining thread integrity through repeated use.
• Precise Class 5g6g thread fit ensures smooth assembly and consistent clamping force, minimizing production delays.
• Partially threaded design allows for focused grip on specific sections, ideal for components needing unthreaded shank support.
• Compliance with DIN 912/ISO 4762 guarantees dimensional accuracy and interchangeability with standard metric components.

Professional Applications & Engineering Value

This M8 left hand socket head cap screw is engineered to address critical challenges in demanding sectors such as automotive, aerospace, and heavy machinery. The black-oxide alloy steel construction combats rust and oxidation, making it suitable for environments exposed to moisture or chemicals. Its left-hand metric coarse thread (1.25mm pitch) is essential for assemblies where right-hand rotation could cause loosening, such as in rotating shafts or specific motor components. The 6mm hex drive and standard socket head profile allow for high-torque installation with common tools, ensuring secure fastening without stripping. With a 30mm length and partial threading, it provides optimal grip in pre-tapped holes, reducing stress concentration and enhancing joint reliability in high-strength industrial applications.

Specification Summary & Compliance

This screw adheres to Class 5g6g thread fit tolerances as per ISO metric standards, ensuring precise engagement. It meets DIN 912 and ISO 4762 specifications for dimensional accuracy and mechanical properties. The product is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, confirming it is free of restricted hazardous substances and safe for industrial use across regulated markets.