Property Class 12.9 Steel Panel Nuts (Thin, Fine Pitch) are supplied to DIN 439. The grade provides requires plating or black-oxide protection and is magnetic; the practical service range is commonly limited to approx. +300 °C; confirm against the coating and the load. Property data, grade comparison and the full size table follow.
Why Choose Property Class 12.9 Steel for Panel Nuts (Thin, Fine Pitch)
The highest common strength class, for high-load machine assembly. For panel nuts (thin, fine pitch), 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 panel nuts (thin, fine pitch) 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 panel nuts (thin, fine pitch) 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 Panel Nuts (Thin, Fine Pitch) Available in Property Class 12.9 Steel
| Thread size | Pitch (mm) | Across flats s (mm) | Across corners e (mm) | Nut height m (mm) | Typical application | Reference standard |
|---|---|---|---|---|---|---|
| M6x0.75 | 0.75 | 10 | 11.05 | 3.2 | Potentiometer bushing | DIN 439 B |
| M8x0.75 | 0.75 | 13 | 14.38 | 4.0 | Toggle switch bushing | DIN 439 B |
| M9x0.75 | 0.75 | 14 | 15.51 | 4.0 | Rotary switch bushing | DIN 439 B |
| M10x0.75 | 0.75 | 17 | 18.90 | 5.0 | Indicator lamp | DIN 439 B |
| M12x1 | 1.0 | 19 | 21.10 | 5.0 | Cable gland PG/M12 | DIN 439 B |
| M16x1.5 | 1.5 | 24 | 26.75 | 6.0 | Cable gland M16 | DIN 439 B |
| M20x1.5 | 1.5 | 30 | 33.53 | 8.0 | Cable gland M20 | DIN 439 B |
