Property Class 12.9 Steel (ISO 898-1 property class 12.9) is the highest common strength class, for high-load machine assembly. Specified on rivet nuts (blind threaded inserts) it determines the corrosion behaviour (requires plating or black-oxide 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 12.9 Steel for Rivet Nuts (Blind Threaded Inserts)
The highest common strength class, for high-load machine assembly. For rivet nuts (blind threaded inserts), this matters when requires plating or black-oxide protection is the primary requirement.
Mechanical & Physical Properties
| Grade designation | ISO 898-1 property class 12.9 |
|---|---|
| Magnetic response | Magnetic |
| Service temperature | commonly limited to approx. +300 °C; confirm against the coating and the load |
| Corrosion characteristic | Requires plating or black-oxide protection |
Corrosion Behavior in Service
Carbon and alloy steel rivet nuts (blind threaded inserts) 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 rivet nuts (blind threaded inserts) 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 Rivet Nuts (Blind Threaded Inserts) Available in Property Class 12.9 Steel
| Thread size | Body diameter (mm) | Body length (mm) | Grip range (mm) | Hole diameter (mm) | Head diameter (mm) | Body form | Material |
|---|---|---|---|---|---|---|---|
| M3 | 5.0 | 9.5 | 0.5~1.5 | 5.0 | 7.0 | Round, open end | Steel zinc / A2 |
| M4 | 6.0 | 11.5 | 0.5~2.0 | 6.0 | 9.0 | Round, open end | Steel zinc / A2 |
| M5 | 7.0 | 12.5 | 0.5~3.0 | 7.0 | 10.0 | Round, open end | Steel zinc / A2 |
| M6 | 9.0 | 15.5 | 0.5~3.0 | 9.0 | 13.0 | Round, open end | Steel zinc / A2 |
| M8 | 11.0 | 17.0 | 0.5~3.5 | 11.0 | 16.0 | Round, open end | Steel zinc |
| M10 | 13.0 | 19.0 | 1.0~4.0 | 13.0 | 18.0 | Round, open end | Steel zinc |
Dimensions are independent of the material: every size above is available in Property Class 12.9 Steel.
Custom manufacturing · Made to drawing
Need this nut in a grade that is not listed?
Grade 12 9 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.
