S-91239A450 M8 x 55 mm ISO 7380 Steel Button Head Hex-Drive Screws

Key Features & Benefits at a Glance

• Exceptional durability and load-bearing capacity with Class 10.9 strength grade and 140,000 psi tensile strength for reliable performance in demanding applications.
• Superior corrosion resistance thanks to the black-oxide finish on alloy steel, extending service life in harsh industrial environments.
• High hardness and wear resistance with Rockwell C32 rating, ensuring the screw maintains integrity under repetitive stress and vibration.
• Secure and efficient installation with a 5 mm hex drive and fully threaded M8x1.25mm coarse pitch design, allowing for quick assembly and strong holding power.
• Precise fit and interchangeability due to Class 6g thread fit and compliance with ISO 7380 standards, reducing the risk of cross-threading and ensuring consistent performance.
• Environmental and regulatory safety with RoHS 3 and REACH compliance, making it suitable for use in regulated industries and eco-conscious projects.
• Versatile rounded button head design that provides a low-profile, aesthetically pleasing finish while minimizing snagging in assembled products.

Professional Applications & Engineering Value

This M8 hex screw is engineered to address common industrial challenges such as vibration loosening, corrosion-induced failure, and assembly inefficiency. The black-oxide alloy steel construction offers enhanced protection against rust and wear, making it ideal for heavy-duty applications in machinery, automotive, and construction sectors. The fully threaded metric coarse thread (M8x1.25mm) ensures maximum grip and load distribution, while the hex drive allows for high-torque installation with standard tools, reducing installation time and improving workflow. By meeting ISO 7380 specifications, it guarantees dimensional accuracy and reliability, providing peace of mind for engineers and procurement specialists who require consistent, high-performance industrial fasteners that withstand rigorous operational demands.

Specification Summary & Compliance

This fastener adheres to precise dimensional standards, including Class 6g thread fit for metric coarse threads, ensuring compatibility and ease of assembly. It is manufactured in compliance with ISO 7380 for rounded head hex screws, confirming consistent quality and performance. Additionally, it meets regulatory requirements such as RoHS 3 (2015/863/EU) and REACH (EC 1907/2006), affirming its safety for use in various industries without hazardous substances.