Material specification page for square weld nuts 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 DIN 928.
Why Choose Property Class 8.8 Steel for Square Weld Nuts
The workhorse medium-carbon alloy class for structural joints. For square weld 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 square weld 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 Square Weld 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 Square Weld Nuts Available in Property Class 8.8 Steel
| Size | Pitch P (mm) | b (mm) | d2 (mm) | d4 (mm) | h1 (mm) | h2 (mm) | Nut height m (mm) | Width across flats s (mm) | Reference standard |
|---|---|---|---|---|---|---|---|---|---|
| M4 | 0.7 | 0.8 | 5 | 6.4 | 0.6 | 0.85 | 3.5 | 7 | DIN 928 |
| M5 | 0.8 | 1 | 6 | 8.2 | 0.8 | 1.05 | 4.2 | 9 | DIN 928 |
| M6 | 1 | 1.2 | 7.5 | 9.1 | 0.8 | 1.25 | 5 | 10 | DIN 928 |
| M8 | 1.25 | 1.5 | 10 | 12.8 | 1 | 1.55 | 6.5 | 14 | DIN 928 |
| M10 | 1.5 | 1.8 | 12.5 | 15.6 | 1.2 | 1.725 | 8 | 17 | DIN 928 |
| M12 | 1.75 | 2 | 13.5 | 17.4 | 1.4 | 2.375 | 9.5 | 19 | DIN 928 |
| (M14) | 2 | 2.5 | 16.8 | 20.4 | 1.4 | 2.475 | 11.4 | 22 | DIN 928 |
| (M16) | 2 | 2.5 | 18.8 | 22.4 | 1.6 | 3 | 13 | 24 | DIN 928 |
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 size is the obvious variable and rarely the interesting one — height for clearance, across-flats for the tool already in the cell, and the locking feature for the vibration actually present. Made by cold heading or tapping.
Minimum order from 2,000 pieces; samples within 7 days of drawing approval.
