S-91280A287 M8 x 85 mm ISO 4014, DIN 931 Medium-Strength Metric Class 8.8 Steel Hex Head Screws

Key Features & Benefits at a Glance

• Enhanced load-bearing capacity with Class 8.8 steel construction, providing 110,000 psi tensile strength for reliable performance in demanding applications
• Superior corrosion resistance and durability thanks to the steel material and black finish, extending service life in harsh industrial environments
• Optimized fastening efficiency with a partially threaded design and 22mm minimum thread length, ensuring secure connections without unnecessary threading
• Easy installation and removal using standard tools with the external hex drive and 13mm head width, reducing assembly time and labor costs
• Precise fit and interchangeability due to M8 coarse thread with Class 6g tolerance, minimizing the risk of cross-threading and improving assembly accuracy
• High hardness rating of Rockwell C21, resisting wear and deformation under repeated stress for long-term reliability
• Compliance with international standards including ISO 4014/DIN 931, ensuring consistent quality and compatibility in global projects

Professional Applications & Engineering Value

This M8 hex head screw is engineered to address common industrial challenges such as vibration loosening and material fatigue. The Class 8.8 steel construction, combined with a coarse thread (M8x1.25), provides excellent grip in various substrates, from metal frames to machinery assemblies. The partially threaded design concentrates stress on the engaged portion, reducing the risk of shear failure and enhancing joint integrity. Ideal for construction, automotive, and heavy equipment applications, this metric hex bolt ensures reliable fastening in high-stress environments while meeting stringent ISO 4014/DIN 931 specifications for dimensional accuracy and performance.

Specification Summary & Compliance

This fastener adheres to precise Class 6g thread fit tolerances per metric standards, with a minimum thread length of 22mm and overall length of 85mm. It conforms to ISO 4014/DIN 931 manufacturing specifications for hex head screws, ensuring consistent thread spacing and head dimensions. Compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, it is free from hazardous substances, making it suitable for environmentally conscious industrial and commercial use.