S-90605A258 M8 x 40 mm DIN 912, ISO 4762 Left-Hand Threaded Alloy Steel Socket Head Screws

Key Features & Benefits at a Glance

• Exceptional strength for demanding applications with Class 12.9 rating and 170,000 psi tensile strength, ensuring reliable performance under high stress.
• Superior corrosion resistance provided by the black-oxide coating on alloy steel, extending service life in harsh industrial environments.
• High durability and wear resistance due to a hardness of Rockwell C37, minimizing deformation and failure over time.
• Secure and precise fastening with a 6mm hex drive and standard socket head profile, allowing for easy installation and high torque application.
• Reliable left-hand thread engagement in M8 x 1.25mm coarse thread, ideal for specialized applications requiring reverse threading to prevent loosening.
• Optimized load distribution with a partially threaded design, reducing stress concentration and improving joint integrity.
• Compliance with international standards including DIN 912/ISO 4762, ensuring consistent quality, interchangeability, and fit.

Professional Applications & Engineering Value

Engineered for high-performance industrial settings, these M8 socket head cap screws address critical challenges in machinery, automotive, and heavy equipment assembly. The black-oxide alloy steel construction offers enhanced corrosion resistance, vital for operations exposed to moisture or chemicals, while the Class 12.9 strength and Rockwell C37 hardness prevent stripping and fatigue under extreme loads. The left-hand metric thread (M8 x 1.25mm coarse) provides a secure fastening solution in systems where standard right-hand threads may loosen due to vibration or rotational forces. With a partially threaded shank and precise hex drive, these screws ensure accurate clamping force distribution, reducing the risk of joint failure and maintenance downtime in demanding applications like precision tools, conveyor systems, and structural frameworks.

Specification Summary & Compliance

This product features precise M8 x 1.25mm coarse threads with a Class 5g6g thread fit for consistent engagement and tolerance. It adheres to DIN 912 and ISO 4762 standards, guaranteeing dimensional accuracy and performance. Compliance with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) ensures environmental safety and regulatory alignment for global industrial use.