Property Class 8.8 Steel (ISO 898-1 property class 8.8) is the workhorse medium-carbon alloy class for structural joints. Specified on channel (strut) nuts with spring it determines the corrosion behaviour (requires plating (zinc) for corrosion protection) and the service temperature range (commonly limited to approx. +300 °C; confirm against the coating and the load); the dimensions are ours rather than a standard's, and are listed in full below.
Why Choose Property Class 8.8 Steel for Channel (Strut) Nuts with Spring
The workhorse medium-carbon alloy class for structural joints. For channel (strut) nuts with spring, this matters when requires plating (zinc) for corrosion protection is the primary requirement.
Mechanical & Physical Properties
| Grade designation | ISO 898-1 property class 8.8 |
|---|---|
| Magnetic response | Magnetic |
| Service temperature | commonly limited to approx. +300 °C; confirm against the coating and the load |
| Corrosion characteristic | Requires plating (zinc) for corrosion protection |
Corrosion Behavior in Service
Carbon and alloy steel channel (strut) nuts with spring require a coating for corrosion protection. Zinc plating (with or without passivation) is the most common; hot-dip galvanizing is used for outdoor structural service; black-oxide is mainly a tarnish-prevention finish for tool-room use.
Galvanic & Galling Considerations
For channel (strut) nuts with spring in steel, the dominant compatibility issue is hydrogen embrittlement at high property classes (10.9 and above) when electroplated. Plating must be followed by an appropriate baking treatment, or a non-electroplated finish (mechanical zinc, zinc flake) should be substituted.
Sizes of Channel (Strut) Nuts with Spring Available in Property Class 8.8 Steel
| Thread size | For channel width (mm) | Nut width (mm) | Nut height (mm) | Spring | Slot engagement | Material | Finish |
|---|---|---|---|---|---|---|---|
| M6 | 41 | 41 | 13 | Long spring | Grooved both ends | Steel | Zinc plated |
| M8 | 41 | 41 | 13 | Long spring | Grooved both ends | Steel | Zinc plated |
| M10 | 41 | 41 | 13 | Long spring | Grooved both ends | Steel | Hot-dip galvanised |
| M12 | 41 | 41 | 13 | Long spring | Grooved both ends | Steel | Hot-dip galvanised |
| M8 | 21 | 21 | 9 | Short spring | Grooved both ends | Steel | Zinc plated |
| M10 | 41 | 41 | 13 | No spring | Grooved both ends | A4 stainless | Passivated |
Dimensions are independent of the material: every size above is available in Property Class 8.8 Steel.
Custom manufacturing · Made to drawing
Need this nut in a grade that is not listed?
Grade 8 8 Steel is one of the grades the catalog describes. Locking method is specifiable independently of the rest: nylon insert, all-metal deformed thread, serrated flange, or none. Made by cold heading or tapping.
Minimum order from 2,000 pieces; samples within 7 days of drawing approval.
