S-91280A209 M12 x 55 mm ISO 4017, DIN 933 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 black oxide coating that extends service life in harsh industrial environments
• Precise thread engagement with Class 6g thread fit and coarse 1.75mm pitch ensuring secure fastening and vibration resistance
• Optimized torque transmission via external hex drive and 19mm head width for efficient installation with standard tools
• Full-thread design versatility allowing installation along the entire 55mm length for flexible positioning and maximum grip
• Consistent mechanical properties with Rockwell C21 hardness maintaining dimensional stability under stress
• Global compliance assurance meeting ISO 4017 standards and environmental regulations for international project specifications

Professional Applications & Engineering Value

These M12 hex head screws deliver critical engineering solutions where high tensile strength and reliable fastening are paramount. Manufactured from grade steel with Class 8.8 strength rating, they address common industrial challenges including joint failure, vibration loosening, and environmental degradation. The fully threaded metric design with coarse 1.75mm pitch provides superior holding power in structural steelwork, heavy machinery assembly, and construction applications. The black oxide surface treatment offers enhanced corrosion protection while maintaining consistent Rockwell C21 hardness throughout the fastener. With external hex drive compatibility and 55mm length, these screws enable efficient installation in confined spaces while meeting rigorous industrial fastener requirements across manufacturing, infrastructure, and equipment maintenance sectors.

Specification Summary & Compliance

This M12 hex head screw features precision Class 6g thread fit according to ISO 4017 standards (equivalent to DIN 933), ensuring dimensional accuracy and interchangeability. The metric coarse thread with 1.75mm pitch and right-hand threading provides optimal engagement in various materials. Manufacturing compliance includes RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations, confirming the absence of restricted substances. The Class 8.8 strength classification guarantees consistent mechanical properties with 110,000 psi tensile strength and Rockwell C21 hardness for reliable performance in industrial applications.