S-91280A886 M20 x 55 mm ISO 4017, DIN 933, SAE J1199, ISO 898 Medium-Strength Metric Class 8.8 Steel Hex Head Screws

Key Features & Benefits at a Glance

• Exceptional load-bearing capacity with Class 8.8 strength rating and 110,000 psi tensile strength for reliable performance in demanding applications
• Superior corrosion resistance through zinc plating, extending service life in harsh industrial environments
• Optimized installation efficiency with external hex drive and standard 30mm head width for secure tool engagement
• Precision thread engagement with M20 coarse thread (2.5mm pitch) and Class 6h fit ensuring consistent clamping force
• Full-threaded design providing maximum grip length and uniform stress distribution along the entire 55mm length
• Certified material integrity with Rockwell C21 hardness for consistent mechanical properties and dimensional stability
• Global compliance assurance meeting ISO 4017, DIN 933, and SAE J1199 standards with RoHS 3 and REACH environmental regulations

Professional Applications & Engineering Value

These M20 hex head screws deliver critical engineering solutions for heavy-duty assembly applications where vibration resistance and structural integrity are paramount. The Class 8.8 steel construction provides reliable performance in machinery frames, structural steel connections, and industrial equipment where dynamic loads are common. The coarse thread design (2.5mm pitch) ensures rapid installation and superior resistance to loosening under vibration, while the zinc plating offers essential protection against corrosion in manufacturing facilities, outdoor installations, and high-humidity environments. The fully threaded configuration maximizes contact surface area, distributing stress evenly and preventing localized failure points in critical joints. These metric fasteners are engineered to maintain clamping force integrity in applications ranging from construction machinery to production line equipment, where consistent performance under repetitive stress cycles is essential.

Specification Summary & Compliance

This M20 hex head screw features precision metric thread specifications with 2.5mm pitch and Class 6h thread fit tolerance, ensuring compatibility with standard metric nuts and threaded components. Manufacturing complies with ISO 4017, DIN 933, and SAE J1199 standards for dimensional accuracy and mechanical properties. The fastener meets RoHS 3 (2015/863/EU) compliance for restricted substances and REACH (EC 1907/2006) regulations for chemical safety, making it suitable for global industrial applications requiring environmental compliance.