Product Description
M8 Serrated Hexagon Flange Bolts – 8.8 High Tensile Zinc Plated Steel
These M8 serrated flange bolts combine a hexagon head with an integral flange and serrations on its underside. Made from grade 8.8 high tensile steel with a zinc plated finish, they feature a standard M8 x 1.25mm metric coarse thread and a DIN 6921 serrated flange head design.
The flange spreads the clamping load across a wider bearing area, while the serrations beneath the head grip the mating surface to help resist loosening caused by vibration. The hexagon head accepts a 13mm spanner or socket for straightforward installation and removal.
Key Features
- Serrated underside: Helps resist rotation and loosening when tightened against a suitable mating surface.
- Integral flange: Provides a wider bearing area beneath the bolt head.
- Grade 8.8 steel: High tensile material for engineering and mechanical fastening.
- Zinc plated finish: Provides additional corrosion protection compared with unplated steel.
- Metric coarse thread: M8 diameter with a 1.25mm pitch.
- Choice of lengths: Select the required length and pack size from the available options.
Technical Specifications
| Thread Size | M8 |
|---|---|
| Thread Pitch | 1.25mm – metric coarse |
| Material | High tensile steel |
| Strength Grade | 8.8 |
| Finish | Zinc plated |
| Head Style | Hexagon flange with serrated underside |
| Standard / Pattern | DIN 6921 – serrated flange version |
| Spanner / Socket Size | 13mm |
| Maximum Flange Diameter | 18mm |
| Maximum Overall Head Height | 8.1mm |
| Thread Coverage | Fully threaded except the 40mm length, which is partially threaded |
| Length Measurement | Measured from beneath the flange to the end of the bolt |
Typical Applications
Suitable for machinery assembly, equipment maintenance, brackets, metal fabrications and general engineering where an M8 high tensile bolt with a serrated flange is required.
Selecting Your Bolts
Choose the length to suit the thickness of the components being joined and the required thread engagement. The 40mm bolt has an unthreaded shank section; all other available lengths are fully threaded.
Explore our hex flange bolts for other sizes, or use our thread data guide to compare metric thread sizes and pitches.
