Grade 12.9 Steel Eye Bolts combine the dimensional form of DIN 580 with the material properties of grade class 12.9: requires plating or black-oxide protection, magnetic, service range up to approx. +300 °C. This page summarizes the grade data, its corrosion behavior in service, the comparable grades, and the sizes supplied.
Why Choose Grade 12.9 Steel for Eye Bolts
The highest common strength class, for high-load machine assembly. For eye bolts, this matters when requires plating or black-oxide protection is the primary requirement.
Mechanical & Physical Properties
| Grade designation | class 12.9 |
|---|---|
| Magnetic response | Magnetic |
| Service temperature | up to approx. +300 °C |
| Corrosion characteristic | Requires plating or black-oxide protection |
Galvanic & Galling Considerations
For eye bolts 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 Eye Bolts, 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 Eye Bolts Available in Grade 12.9 Steel
| Thread size | Pitch (mm) | Ring inside diameter d (mm) | Ring outside diameter (mm) | Thread length (mm) | Max load vertical (kg) | Reference standard | Notes |
|---|---|---|---|---|---|---|---|
| M6 | 1.0 | 20 | 36 | 12 | 70 | DIN 580 / WLL | Drop-forged lifting eye bolt, vertical pull |
| M8 | 1.25 | 25 | 45 | 16 | 140 | DIN 580 / WLL | Drop-forged lifting eye bolt, vertical pull |
| M10 | 1.5 | 30 | 54 | 20 | 230 | DIN 580 / WLL | Drop-forged lifting eye bolt, vertical pull |
| M12 | 1.75 | 36 | 63 | 24 | 340 | DIN 580 / WLL | Drop-forged lifting eye bolt, vertical pull |
| M14 | 2.0 | 42 | 72 | 28 | 500 | DIN 580 / WLL | Drop-forged lifting eye bolt, vertical pull |
| M16 | 2.0 | 45 | 81 | 32 | 700 | DIN 580 / WLL | Drop-forged lifting eye bolt, vertical pull |
| M18 | 2.5 | 50 | 90 | 36 | 930 | DIN 580 / WLL | Drop-forged lifting eye bolt, vertical pull |
| M20 | 2.5 | 56 | 99 | 40 | 1200 | DIN 580 / WLL | Drop-forged lifting eye bolt, vertical pull |
| M24 | 3.0 | 63 | 117 | 48 | 1800 | DIN 580 / WLL | Drop-forged lifting eye bolt, vertical pull |
| M30 | 3.5 | 80 | 144 | 60 | 3200 | DIN 580 / WLL | Drop-forged lifting eye bolt, vertical pull |
| M36 | 4.0 | 95 | 171 | 72 | 4600 | DIN 580 / WLL | Drop-forged lifting eye bolt, vertical pull |