S-90379A107 M8 x 40 mm JIS B 1180 JIS Medium-Strength Steel Hex Head Screws
JIS Medium-Strength Steel Hex Head Screws
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Basic Information
Head Parameters
Dimensions
Thread Parameters
Tip & Drive Parameters
Material & Strength
Temperature & Environment
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Key Features & Benefits at a Glance
- Superior corrosion resistance with zinc yellow-chromate plating for extended service life in harsh environments
- High tensile strength of 110,000 psi ensures reliable performance under heavy loads and vibration
- Class 8.8 strength grade provides excellent mechanical properties for demanding industrial applications
- Rockwell C21 hardness offers optimal balance between strength and ductility
- Fully threaded design allows for maximum grip length and uniform stress distribution
- External hex drive enables easy installation with standard tools and high torque application
- Class 6g thread fit ensures precise mating with nuts and threaded components
Professional Applications & Engineering Value
These M8 hex head screws with coarse thread (1.25mm pitch) and Class 8.8 steel construction are engineered to solve critical fastening challenges in industrial environments. The zinc yellow-chromate plating provides exceptional corrosion protection, making them ideal for outdoor equipment, machinery, and automotive applications where exposure to moisture and chemicals is common. The fully threaded 40mm length ensures maximum engagement and load distribution, while the external hex drive allows for high-torque installation without stripping. Meeting JIS B 1180 specifications, these metric hex bolts deliver consistent performance in assembly lines, structural frameworks, and heavy equipment where high tensile strength and reliability are paramount.
Specification Summary & Compliance
This M8 x 1.25mm x 40mm hex head screw features Class 6g thread fit tolerance and coarse thread spacing according to metric standards. The fastener complies with JIS B 1180 specifications and maintains dimensional accuracy throughout production. Manufactured from Class 8.8 steel with Rockwell C21 hardness and 110,000 psi tensile strength, it meets industry standards for mechanical fasteners. The zinc yellow-chromate plating provides RoHS and REACH compliant corrosion protection for environmentally conscious applications.
