Material page for elastomer-sealing nuts in Property Class 12.9 Steel (ISO 898-1 property class 12.9). The sizes below are the ones we supply; there is no published dimensional standard for this article, so the table rather than a standard number is what to quote. Corrosion behaviour is requires plating or black-oxide protection and the service range is commonly limited to approx. +300 °C; confirm against the coating and the load.
Why Choose Property Class 12.9 Steel for Elastomer-Sealing Nuts
The highest common strength class, for high-load machine assembly. For elastomer-sealing nuts, 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 elastomer-sealing nuts 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.
Comparable Grades
For Elastomer-Sealing Nuts, class 8.8 is the comparable strength step. Move up when the joint preload approaches the proof load of the current class; move down when the joint is over-specified. For corrosion-critical service, switch to stainless A2 or A4.
Sizes of Elastomer-Sealing Nuts Available in Property Class 12.9 Steel
| Thread size | Pitch (mm) | Sealing-rib height (mm) | Thread class | Temperature range (°C) | Finish |
|---|---|---|---|---|---|
| M3 | 0.5 | 0.2 | 6H | -75~+204 | zinc-chromate plated low-carbon steel |
| M4 | 0.7 | 0.3 | 6H | -75~+204 | zinc-chromate plated low-carbon steel |
| M5 | 0.8 | 0.4 | 6H | -75~+204 | zinc-chromate plated low-carbon steel |
| M6 | 1.0 | 0.5 | 6H | -75~+204 | zinc-chromate plated low-carbon steel |
| M8 | 1.25 | 0.6 | 6H | -75~+204 | zinc-chromate plated low-carbon steel |
| M10 | 1.5 | 0.6 | 6H | -75~+204 | zinc-chromate plated low-carbon steel |
| M12 | 1.75 | 0.8 | 6H | -75~+204 | zinc-chromate plated low-carbon steel |
| M14 | 2.0 | 6H | -75~+204 | zinc-chromate plated low-carbon steel |
Dimensions are independent of the material: the table above lists the sizes supplied, and on this page every one of them is quoted in Property Class 12.9 Steel. The catalogue's default material column has been omitted here so it cannot be read as contradicting that.
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.
