Specifying Lifting Eye Nuts in Grade 8.8 Steel pairs the dimensional form of Lifting Eye Nuts (DIN 582) with the engineering properties of Grade 8.8 Steel. This page explains when to choose the grade, how it behaves in service, and which grades to compare it against.
Why Choose Grade 8.8 Steel for Lifting Eye Nuts
The workhorse medium-carbon alloy grade for structural joints. For lifting eye nuts, this matters when requires plating (zinc) for corrosion protection is the primary requirement.
Mechanical & Physical Properties
| Grade designation | class 8.8 |
|---|---|
| Magnetic response | Magnetic |
| Service temperature | up to approx. +300 °C |
| Corrosion characteristic | Requires plating (zinc) for corrosion protection |
Galvanic & Galling Considerations
For lifting eye 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.
Comparable Grades
For Lifting Eye Nuts, class 10.9 or 12.9 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 Lifting Eye Nuts Available in Grade 8.8 Steel
| Thread size | Pitch (mm) | Ring inside diameter d (mm) | Ring outside diameter (mm) | Total height (mm) | Max load vertical (kg) | Reference standard | Notes |
|---|---|---|---|---|---|---|---|
| M6 | 1.0 | 20 | 36 | 36 | 70 | DIN 582 / WLL | Drop-forged lifting eye nut, vertical pull |
| M8 | 1.25 | 25 | 45 | 45 | 140 | DIN 582 / WLL | Drop-forged lifting eye nut, vertical pull |
| M10 | 1.5 | 30 | 54 | 54 | 230 | DIN 582 / WLL | Drop-forged lifting eye nut, vertical pull |
| M12 | 1.75 | 36 | 63 | 63 | 340 | DIN 582 / WLL | Drop-forged lifting eye nut, vertical pull |
| M16 | 2.0 | 45 | 81 | 81 | 700 | DIN 582 / WLL | Drop-forged lifting eye nut, vertical pull |
| M20 | 2.5 | 56 | 99 | 99 | 1200 | DIN 582 / WLL | Drop-forged lifting eye nut, vertical pull |
| M24 | 3.0 | 63 | 117 | 117 | 1800 | DIN 582 / WLL | Drop-forged lifting eye nut, vertical pull |
| M30 | 3.5 | 80 | 144 | 144 | 3200 | DIN 582 / WLL | Drop-forged lifting eye nut, vertical pull |
| M36 | 4.0 | 95 | 171 | 171 | 4600 | DIN 582 / WLL | Drop-forged lifting eye nut, vertical pull |