Property Class 8.8 Steel T-Slot Nuts are supplied to DIN 508. The grade provides requires plating (zinc) for corrosion 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 8.8 Steel for T-Slot Nuts
The workhorse medium-carbon alloy class for structural joints. For t-slot nuts, 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 t-slot 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.
Galvanic & Galling Considerations
For t-slot nuts 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 T-Slot Nuts Available in Property Class 8.8 Steel
| Size | T-slot width a (mm) | Nut width b (mm) | Total height h (mm) | Neck height k (mm) | Chamfer f (mm) | Reference standard |
|---|---|---|---|---|---|---|
| M4 | 5 | 9 | 6.5 | 3 | 1 | DIN 508 |
| M5 | 6 | 10 | 8 | 4 | 1.6 | DIN 508 |
| M6 | 8 | 13 | 10 | 6 | 1.6 | DIN 508 |
| M8 | 10 | 15 | 12 | 6 | 1.6 | DIN 508 |
| M10 | 12 | 18 | 14 | 7 | 2.5 | DIN 508 |
| M12 | 14 | 22 | 16 | 8 | 2.5 | DIN 508 |
| M16 | 18 | 28 | 20 | 10 | 2.5 | DIN 508 |
| M20 | 22 | 35 | 28 | 14 | 2.5 | DIN 508 |
| M24 | 28 | 44 | 36 | 18 | 4 | DIN 508 |
| M30 | 36 | 54 | 44 | 22 | 6 | DIN 508 |
| M36 | 42 | 65 | 52 | 26 | 6 | DIN 508 |
| M42 | 48 | 75 | 60 | 30 | 6 | DIN 508 |
| M48 | 54 | 85 | 70 | 34 | 6 | DIN 508 |
