Property Class 8.8 Steel (ISO 898-1 property class 8.8) is the workhorse medium-carbon alloy class for structural joints. Specified on push-button quick-adjust nuts it determines the corrosion behaviour (requires plating (zinc) for corrosion protection) and the service temperature range (commonly limited to approx. +300 °C; confirm against the coating and the load); the dimensions are ours rather than a standard's, and are listed in full below.
Why Choose Property Class 8.8 Steel for Push-Button Quick-Adjust Nuts
The workhorse medium-carbon alloy class for structural joints. For push-button quick-adjust 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 push-button quick-adjust 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 push-button quick-adjust 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 Push-Button Quick-Adjust Nuts Available in Property Class 8.8 Steel
| For rod thread | Body width (mm) | Body height (mm) | Holding force (N, typical) | Holding vs standard nut | Operation | Material | Use |
|---|---|---|---|---|---|---|---|
| M8 | 32 | 18 | 2500 | approx. 25% | Push button | Zinc alloy body, steel half nut | Jigs, adjustable frames |
| M10 | 38 | 20 | 4000 | approx. 25% | Push button | Zinc alloy body, steel half nut | Jigs, adjustable frames |
| M12 | 44 | 24 | 6000 | approx. 25% | Push button | Zinc alloy body, steel half nut | Clamping rigs |
| M16 | 54 | 28 | 10000 | approx. 25% | Push button | Zinc alloy body, steel half nut | Clamping rigs |
Dimensions are independent of the material: every size above is available in Property Class 8.8 Steel.
Custom manufacturing · Made to drawing
Need this nut in a grade that is not listed?
Grade 8 8 Steel is one of the grades the catalog describes. Locking method is specifiable independently of the rest: nylon insert, all-metal deformed thread, serrated flange, or none. Made by cold heading or tapping.
Minimum order from 2,000 pieces; samples within 7 days of drawing approval.
