Material specification page for slotted set screws with cone point in Property Class 12.9 Steel. Covers the grade designation (ISO 898-1 property class 12.9), corrosion and magnetic behavior, comparable grades and their trade-offs, and the sizes available to ISO 7434.
Why Choose Property Class 12.9 Steel for Slotted Set Screws with Cone Point
The highest common strength class, for high-load machine assembly. For slotted set screws with cone 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 cone 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.
Comparable Grades
For Slotted Set Screws with Cone Point, class 8.8 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 Set Screws with Cone Point Available in Property Class 12.9 Steel
| Size | dt_max (mm) | n_nom (mm) | n_min (mm) | n_max (mm) | t_nom_min (mm) | t_max (mm) | Length range l (mm) | Reference standard |
|---|---|---|---|---|---|---|---|---|
| M1.2 | 0.12 | 0.2 | 0.26 | 0.4 | 0.4 | 0.52 | 2~6 | ISO 7434 |
| M1.6 | 0.16 | 0.25 | 0.31 | 0.45 | 0.56 | 0.74 | 2~8 | ISO 7434 |
| M2 | 0.2 | 0.25 | 0.31 | 0.45 | 0.64 | 0.84 | 3~10 | ISO 7434 |
| M2.5 | 0.25 | 0.4 | 0.46 | 0.6 | 0.72 | 0.95 | 3~12 | ISO 7434 |
| M3 | 0.3 | 0.4 | 0.46 | 0.6 | 0.8 | 1.05 | 4~16 | ISO 7434 |
| (M3.5) | 0.35 | 0.5 | 0.56 | 0.7 | 0.96 | 1.21 | ISO 7434 | |
| M4 | 0.4 | 0.6 | 0.66 | 0.8 | 1.12 | 1.42 | 6~20 | ISO 7434 |
| M5 | 0.5 | 0.8 | 0.86 | 1 | 1.25 | 1.63 | 8~25 | ISO 7434 |
| M6 | 1.5 | 1 | 1.06 | 1.2 | 1.6 | 2 | 8~30 | ISO 7434 |
| M8 | 2 | 1.2 | 1.26 | 1.51 | 2 | 2.5 | 10~40 | ISO 7434 |
| M10 | 2.5 | 1.6 | 1.66 | 1.91 | 2.4 | 3 | 12~50 | ISO 7434 |
| M12 | 3 | 2 | 2.06 | 2.31 | 2.8 | 3.6 | 14~60 | ISO 7434 |
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.
