Grade 8.8 Steel Wing Nuts pairs the standard DIN 315 with a Grade 8.8 Steel base material. The sections below cover why engineers select this grade for wing nuts, its corrosion and temperature behavior, and the sizes available.
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.
Comparable Grades
For Wing 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 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 |