S-91280A309 M12 x 75 mm ISO 4014, DIN 931 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 durability and wear resistance thanks to Rockwell C21 hardness steel construction
• Optimized thread engagement with M12 coarse thread (1.75mm pitch) ensuring faster installation and reduced cross-threading risks
• Secure torque transmission through external hex drive design providing excellent grip with standard tools
• Versatile partial threading allowing unthreaded shank section for precise clamping and shear resistance
• International compliance assurance meeting ISO 4014/DIN 931 specifications for global project compatibility
• Environmental regulation compliance with RoHS 3 and REACH standards for sustainable manufacturing

Professional Applications & Engineering Value

This M12 hex head screw delivers exceptional engineering value through its Class 8.8 steel construction and precision metric threading. The combination of 110,000 psi tensile strength and Rockwell C21 hardness provides critical resistance against vibration loosening and fatigue failure in heavy machinery, structural frameworks, and industrial equipment. The partially threaded design creates an optimal balance where the unthreaded shank withstands shear forces while the threaded portion maintains clamping pressure. With coarse thread pitch and external hex drive, installation efficiency is maximized in construction, manufacturing, and mechanical assembly applications where time and reliability are paramount. The right-hand thread direction ensures compatibility with standard installation practices across global industrial sectors.

Specification Summary & Compliance

This metric hex head screw features precise M12 x 1.75mm thread dimensions with Class 6g thread fit tolerance ensuring consistent mating with corresponding nuts. Manufacturing strictly adheres to ISO 4014/DIN 931 standards for dimensional accuracy and mechanical properties. The fastener demonstrates full compliance with RoHS 3 (2015/863/EU) restrictions on hazardous substances and REACH (EC 1907/2006) regulations concerning chemical safety. With a specified minimum thread length of 30mm and overall length of 75mm, this steel hex bolt maintains dimensional integrity across production batches for reliable performance in industrial fastening applications.