Material specification page for slotted terminal screws 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 84.
Why Choose Property Class 8.8 Steel for Slotted Terminal Screws
The workhorse medium-carbon alloy class for structural joints. For slotted terminal screws, 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 slotted terminal screws 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 Slotted Terminal Screws, 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 Slotted Terminal Screws Available in Property Class 8.8 Steel
| Thread size | Pitch (mm) | Head diameter dk (mm) | Head height k (mm) | Slot width n (mm) | Slot depth t (mm) | Common material | Common length range (mm) | Reference standard |
|---|---|---|---|---|---|---|---|---|
| M2.5 | 0.45 | 4.5 | 1.8 | 0.6 | 1.1 | Brass CW614N | 4~20 | DIN 84 |
| M3 | 0.5 | 5.5 | 2.0 | 0.8 | 1.2 | Brass CW614N | 4~25 | DIN 84 |
| M3.5 | 0.6 | 6.0 | 2.4 | 1.0 | 1.5 | Brass CW614N | 5~30 | DIN 84 |
| M4 | 0.7 | 7.0 | 2.6 | 1.2 | 1.6 | Brass CW614N | 5~35 | DIN 84 |
| M5 | 0.8 | 8.5 | 3.3 | 1.2 | 2.0 | Brass CW614N | 6~40 | DIN 84 |
| M6 | 1.0 | 10.0 | 3.9 | 1.6 | 2.4 | Brass CW614N | 8~50 | DIN 84 |
