S-90379A104 M8 x 25 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, extending service life in harsh industrial environments.
- High tensile strength of 110,000 psi ensures reliable performance in demanding, heavy-duty applications.
- Class 8.8 strength grade provides excellent load-bearing capacity and durability for structural fastening.
- Coarse M8 x 1.25mm threading offers quick assembly and reduced risk of cross-threading during installation.
- External hex head design allows for high torque application with standard tools, ensuring secure tightening.
- Class 6g thread fit guarantees precise, consistent engagement with nuts and tapped holes, minimizing loosening.
- Full threading along the 25mm length enables versatile positioning and uniform stress distribution.
Professional Applications & Engineering Value
This M8 hex head screw is engineered to address common industrial fastening challenges, such as vibration-induced loosening and environmental corrosion. The steel material and Class 8.8 strength provide robust support for heavy machinery, automotive assemblies, and construction frameworks, where failure is not an option. The zinc yellow-chromate finish significantly enhances corrosion resistance, making it ideal for outdoor or humid conditions. With a coarse thread pitch of 1.25mm and external hex drive, installation is swift and secure, reducing labor time and improving productivity in high-volume manufacturing and maintenance operations.
Specification Summary & Compliance
This fastener features metric coarse threading (M8 x 1.25mm) with a Class 6g thread fit for precise dimensional accuracy. It complies with JIS B 1180 standards, ensuring consistent quality and interchangeability. The fully threaded design and 25mm length provide reliable performance, backed by a Rockwell C21 hardness and 110,000 psi tensile strength. Meets common industry requirements for heavy-duty applications, with materials and plating suitable for RoHS and REACH environmental directives.
