Property Class 8.8 Steel (ISO 898-1 property class 8.8) is the workhorse medium-carbon alloy class for structural joints. Specified on self-clinching threaded studs and pins 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 Self-Clinching Threaded Studs and Pins
The workhorse medium-carbon alloy class for structural joints. For self-clinching threaded studs and pins, 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 self-clinching threaded studs and pins 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 self-clinching threaded studs and pins 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 Self-Clinching Threaded Studs and Pins Available in Property Class 8.8 Steel
| Thread size | Length options (mm) | Head form | Material options | Example installation hole (mm) | Example sheet thickness (mm) | Example pull-through (N) |
|---|---|---|---|---|---|---|
| M2.5 | 6 / 8 / 12 / 18 | flush-head stud | steel / stainless steel / aluminum | 2.5 | 1.0~1.95 | 2600 at 1.6 mm aluminum; 2800 at 1.5 mm steel |
| M3 | 6 / 8 / 12 / 18 | flush-head stud | steel / stainless steel / aluminum |
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. Height and across-flats are the two most often changed — a thinner nut for clearance, a larger hex for a tool that is already on the line. Made by cold heading or tapping.
Minimum order from 2,000 pieces; samples within 7 days of drawing approval.
