Grade 8.8 Steel Wing Nuts are stocked to DIN 315. The grade provides requires plating (zinc) for corrosion protection and is magnetic; the practical service range is up to approx. +300 °C. Property data, grade comparison and the full size table follow.
Why Choose Grade 8.8 Steel for Wing Nuts
The workhorse medium-carbon alloy grade for structural joints. For wing 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 |
Corrosion Behavior in Service
Carbon and alloy steel wing 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 wing 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 Wing Nuts Available in Grade 8.8 Steel
| Size | Pitch (mm) | Wing span (mm) | Wing height (mm) | Body height (mm) | Reference standard | Notes |
|---|---|---|---|---|---|---|
| M4 | 0.7 | 28 | 17 | 9 | DIN 315 | Hand-tightened wing nut |
| M5 | 0.8 | 32 | 19 | 10 | DIN 315 | Hand-tightened wing nut |
| M6 | 1.0 | 37 | 22 | 12 | DIN 315 | Hand-tightened wing nut |
| M8 | 1.25 | 45 | 27 | 15 | DIN 315 | Hand-tightened wing nut |
| M10 | 1.5 | 55 | 33 | 18 | DIN 315 | Hand-tightened wing nut |
| M12 | 1.75 | 64 | 38 | 22 | DIN 315 | Hand-tightened wing nut |