For fine-thread hex nuts, style 2 in Property Class 8.8 Steel, the controlling selection factors are corrosion exposure, strength requirement and service temperature. The grade data for Property Class 8.8 Steel (ISO 898-1 property class 8.8) is summarized below together with every size supplied.
Why Choose Property Class 8.8 Steel for Fine-Thread Hex Nuts, Style 2
The workhorse medium-carbon alloy class for structural joints. For fine-thread hex nuts, style 2, 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 fine-thread hex nuts, style 2 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 fine-thread hex nuts, style 2 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 Fine-Thread Hex Nuts, Style 2 Available in Property Class 8.8 Steel
| Size | Pitch P (mm) | c (mm) | damax (mm) | dw (mm) | Width across corners e (mm) | Nut height m (mm) | mw (mm) | Width across flats s (mm) | Reference standard |
|---|---|---|---|---|---|---|---|---|---|
| M8x1 | 1.0 | 0.3 | 8.75 | 11.63 | 14.38 | 7.5 | 5.71 | 13.0 | ISO 8674 |
| M10x1 | 1.0 | 0.3 | 10.8 | 14.63 | 17.77 | 9.3 | 7.15 | 16.0 | ISO 8674 |
| M10x1.25 | 1.25 | 0.3 | 10.8 | 14.63 | 17.77 | 9.3 | 7.15 | 16.0 | ISO 8674 |
| M12x1.5 | 1.5 | 0.3 | 13.0 | 16.63 | 20.3 | 12.0 | 9.62 | 18.0 | ISO 8674 |
| M12x1.25 | 1.25 | 0.3 | 13.0 | 16.63 | 20.3 | 12.0 | 9.62 | 18.0 | ISO 8674 |
| (M14x1.5) | 1.5 | 0.3 | 15.1 | 19.64 | 23.36 | 14.1 | 10.72 | 21.0 | ISO 8674 |
| M16x1.5 | 1.5 | 0.4 | 17.3 | 22.49 | 26.75 | 16.4 | 12.56 | 24.0 | ISO 8674 |
| M18x1.5 | 1.5 | 0.4 | 19.5 | 24.85 | 29.56 | 17.6 | 13.52 | 27.0 | ISO 8674 |
| M20x1.5 | 1.5 | 0.4 | 21.6 | 27.7 | 32.95 | 20.3 | 15.2 | 30.0 | ISO 8674 |
| (M20x2) | 2.0 | 0.4 | 21.6 | 27.7 | 32.95 | 20.3 | 15.2 | 30.0 | ISO 8674 |
| (M22x1.5) | 1.5 | 0.4 | 23.7 | 31.35 | 37.29 | 21.8 | 16.4 | 34.0 | ISO 8674 |
| M24x2 | 2.0 | 0.4 | 25.9 | 33.25 | 39.5 | 23.9 | 18.08 | 36.0 | ISO 8674 |
| (M27x2) | 2.0 | 0.4 | 29.1 | 38.0 | 45.2 | 26.7 | 20.32 | 41.0 | ISO 8674 |
| M30x2 | 2.0 | 0.4 | 32.4 | 42.75 | 50.85 | 28.6 | 21.85 | 46.0 | ISO 8674 |
| (M33x2) | 2.0 | 0.4 | 35.6 | 46.55 | 55.37 | 32.5 | 24.72 | 50.0 | ISO 8674 |
| M36x3 | 3.0 | 0.4 | 38.9 | 51.11 | 60.79 | 34.7 | 26.48 | 55.0 | ISO 8674 |
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.
