Material specification page for thin hex nuts, unchamfered in Property Class 8.8 Steel. Covers the grade designation (ISO 898-1 property class 8.8), corrosion and magnetic behavior, comparable grades and their trade-offs, and the sizes available to ISO 4036.
Why Choose Property Class 8.8 Steel for Thin Hex Nuts, Unchamfered
The workhorse medium-carbon alloy class for structural joints. For thin hex nuts, unchamfered, 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 thin hex nuts, unchamfered 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 Thin Hex Nuts, Unchamfered, 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 Thin Hex Nuts, Unchamfered Available in Property Class 8.8 Steel
| Size | Pitch P (mm) | Width across corners e (mm) | Nut height m (mm) | Width across flats s (mm) | Reference standard |
|---|---|---|---|---|---|
| M1.6 | 0.35 | 3.4 | 1.0 | 3.2 | ISO 4036 |
| M2 | 0.4 | 4.4 | 1.2 | 4.0 | ISO 4036 |
| M2.5 | 0.45 | 5.5 | 1.6 | 5.0 | ISO 4036 |
| M3 | 0.5 | 6.1 | 1.8 | 5.5 | ISO 4036 |
| (M3.5) | 0.6 | 6.6 | 2.0 | 6.0 | ISO 4036 |
| M4 | 0.7 | 7.7 | 2.2 | 7.0 | ISO 4036 |
| M5 | 0.8 | 8.9 | 2.7 | 8.0 | ISO 4036 |
| M6 | 1.0 | 10.9 | 3.2 | 10.0 | ISO 4036 |
| M8 | 1.25 | 14.5 | 4.0 | 13.0 | ISO 4036 |
| M10 | 1.5 | 17.9 | 5.0 | 16.0 | ISO 4036 |
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. Thread, height, across-flats, property class, locking feature and flange form can all be varied, including thread sizes the standard series does not run to. Made by cold heading or tapping.
Minimum order from 2,000 pieces; samples within 7 days of drawing approval.
