S-91280A089 M8 x 55 mm ISO 4017, DIN 933 Medium-Strength Metric Class 8.8 Steel Hex Head Screws

Key Features & Benefits at a Glance

• Superior load-bearing capacity with Class 8.8 strength rating and 110,000 psi tensile strength for reliable performance in demanding applications
• Enhanced corrosion resistance and professional appearance from the black steel finish, extending service life in industrial environments
• Secure and efficient installation enabled by the external hex drive and 13mm head width, allowing for high torque application
• Excellent thread engagement and vibration resistance due to the coarse M8x1.25 thread pitch and Class 6g thread fit
• Consistent hardness and wear resistance provided by Rockwell C21, ensuring dimensional stability under stress
• Full-length threading (55mm) for maximum grip and uniform clamping force across the entire fastener length
• Guaranteed material safety and environmental compliance meeting RoHS 3 and REACH standards for global industrial use

Professional Applications & Engineering Value

This M8 hex head screw is engineered to address critical challenges in machinery assembly, structural frameworks, and heavy-duty equipment. The Class 8.8 steel construction provides a robust solution for applications requiring high tensile strength and fatigue resistance, such as automotive components, conveyor systems, and industrial enclosures. The fully threaded design with coarse thread spacing ensures rapid assembly and superior holding power in materials like steel and cast iron, reducing the risk of loosening under dynamic loads. Compliant with ISO 4017 (equivalent to DIN 933), this metric hex screw guarantees dimensional accuracy and interchangeability, streamlining procurement and maintenance processes for engineers and OEMs.

Specification Summary & Compliance

This fastener adheres to precise dimensional standards with a Class 6g thread fit per metric specifications, ensuring consistent performance in threaded holes. Manufacturing follows ISO 4017 for hex head screws, confirming compliance with international engineering requirements. The product is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, affirming the use of safe, restricted-substance-free materials in its production.