Property Class 12.9 Steel Slotted Set Screws with Cup Point are supplied to ISO 7436. The grade provides requires plating or black-oxide protection and is magnetic; the practical service range is commonly limited to approx. +300 °C; confirm against the coating and the load. Property data, grade comparison and the full size table follow.
Why Choose Property Class 12.9 Steel for Slotted Set Screws with Cup Point
The highest common strength class, for high-load machine assembly. For slotted set screws with cup point, this matters when requires plating or black-oxide protection is the primary requirement.
Mechanical & Physical Properties
| Grade designation | ISO 898-1 property class 12.9 |
|---|---|
| Magnetic response | Magnetic |
| Service temperature | commonly limited to approx. +300 °C; confirm against the coating and the load |
| Corrosion characteristic | Requires plating or black-oxide protection |
Corrosion Behavior in Service
Carbon and alloy steel slotted set screws with cup point 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 slotted set screws with cup point 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 Slotted Set Screws with Cup Point Available in Property Class 12.9 Steel
| Size | dz_min (mm) | dz_max (mm) | n_nom (mm) | n_min (mm) | n_max (mm) | t_min (mm) | t_max (mm) | Length range l (mm) | Reference standard |
|---|---|---|---|---|---|---|---|---|---|
| M1.6 | 0.55 | 0.8 | 0.25 | 0.31 | 0.45 | 0.56 | 0.74 | 2~8 | ISO 7436 |
| M2 | 0.75 | 1 | 0.25 | 0.31 | 0.45 | 0.64 | 0.84 | 2.5~10 | ISO 7436 |
| M2.5 | 0.95 | 1.2 | 0.4 | 0.46 | 0.6 | 0.72 | 0.95 | 3~12 | ISO 7436 |
| M3 | 1.15 | 1.4 | 0.4 | 0.46 | 0.6 | 0.8 | 1.05 | 3~16 | ISO 7436 |
| M3.5 | 1.45 | 1.7 | 0.5 | 0.56 | 0.7 | 0.96 | 1.21 | 4~20 | ISO 7436 |
| M4 | 1.75 | 2 | 0.6 | 0.66 | 0.8 | 1.12 | 1.42 | 4~20 | ISO 7436 |
| M5 | 2.25 | 2.5 | 0.8 | 0.86 | 1 | 1.28 | 1.63 | 5~25 | ISO 7436 |
| M6 | 2.75 | 3 | 1 | 1.06 | 1.2 | 1.6 | 2 | 6~30 | ISO 7436 |
| M8 | 4.7 | 5 | 1.2 | 1.26 | 1.51 | 2 | 2.5 | 8~40 | ISO 7436 |
| M10 | 5.7 | 6 | 1.6 | 1.66 | 1.91 | 2.4 | 3 | 10~50 | ISO 7436 |
| M12 | 7.7 | 8 | 2 | 2.06 | 2.31 | 2.8 | 3.6 | 12~60 | ISO 7436 |
Dimensions are independent of the material: every size above is available in Property Class 12.9 Steel.
Custom manufacturing · Made to drawing
Need this screw in a grade that is not listed?
Grade 12 9 Steel is one of the grades the catalog describes. Material and finish are usually what drives a special — a grade the standard part is not stocked in, or a coating chosen against a salt-spray figure instead of a default. Made by cold heading or warm forging.
Minimum order from 2,000 pieces; samples within 7 days of drawing approval.
