S-90379A112 M8 x 70 mm JIS B 1180 JIS Medium-Strength Steel Hex Head Screws

Key Features & Benefits at a Glance

• Enhanced corrosion resistance with zinc yellow-chromate plating for extended service life in harsh environments
• Superior load-bearing capability from Class 8.8 strength grade and 110,000 psi tensile strength for heavy-duty applications
• Reliable thread engagement with Class 6g thread fit ensuring precise mating and vibration resistance
• Quick installation and removal through external hex drive design compatible with standard tools
• Optimized for coarse threading applications with M8 x 1.25mm pitch providing excellent holding power in brittle materials
• Full-thread design delivering consistent clamping force along the entire 70mm length
• Certified quality assurance meeting JIS B 1180 specifications for guaranteed dimensional accuracy

Professional Applications & Engineering Value

These M8 hex head screws deliver critical engineering solutions where high tensile strength and corrosion protection are paramount. The Class 8.8 steel construction with Rockwell C21 hardness provides structural integrity for heavy machinery, automotive assemblies, and construction equipment. The zinc yellow-chromate finish creates a protective barrier against oxidation and chemical exposure, significantly extending maintenance intervals in industrial environments. With fully threaded coarse pitch design and external hex drive, these fasteners enable rapid installation while maintaining secure connections in high-vibration applications. The metric coarse thread (M8 x 1.25mm) ensures optimal performance in cast iron, aluminum, and other materials where fine threads might compromise material integrity.

Specification Summary & Compliance

Manufactured to precise metric dimensions with Class 6g thread fit tolerance ensuring compatibility with standard nuts and threaded holes. The 70mm length and 12mm hex head provide standardized installation across industrial applications. These hex head screws conform to JIS B 1180 specifications and feature right-hand thread direction with coarse thread spacing. The zinc yellow-chromate plating meets industry standards for corrosion protection while the Class 8.8 strength rating (equivalent to ISO 898-1) guarantees consistent mechanical performance.