Material page for split nuts (axially slotted) in Property Class 12.9 Steel (ISO 898-1 property class 12.9). The sizes below are the ones we supply; there is no published dimensional standard for this article, so the table rather than a standard number is what to quote. Corrosion behaviour is requires plating or black-oxide protection and the service range is commonly limited to approx. +300 °C; confirm against the coating and the load.
Why Choose Property Class 12.9 Steel for Split Nuts (Axially Slotted)
The highest common strength class, for high-load machine assembly. For split nuts (axially slotted), 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 split nuts (axially slotted) 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 Split Nuts (Axially Slotted), 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 Split Nuts (Axially Slotted) Available in Property Class 12.9 Steel
| Thread size | Pitch (mm) | Width across flats s (mm) | Width across corners e (mm) | Nut height m (mm) | Slot width (mm) | Material | Blank standard |
|---|---|---|---|---|---|---|---|
| M8 | 1.25 | 13.0 | 14.38 | 6.8 | 1.5 | Free-cutting steel | DIN 934 blank |
| M10 | 1.5 | 17.0 | 18.90 | 8.4 | 2.0 | Free-cutting steel | DIN 934 blank |
| M12 | 1.75 | 19.0 | 21.10 | 10.8 | 2.0 | Free-cutting steel | DIN 934 blank |
| M16 | 2.0 | 24.0 | 26.75 | 14.8 | 2.5 | Free-cutting steel | DIN 934 blank |
| M20 | 2.5 | 30.0 | 33.53 | 18.0 | 3.0 | Free-cutting steel | DIN 934 blank |
Dimensions are independent of the material: every size above is available in Property Class 12.9 Steel.
Custom manufacturing · Made to drawing
Need this nut in a grade that is not listed?
Grade 12 9 Steel is one of the grades the catalog describes. Locking method is specifiable independently of the rest: nylon insert, all-metal deformed thread, serrated flange, or none. Made by cold heading or tapping.
Minimum order from 2,000 pieces; samples within 7 days of drawing approval.
