T-Slot Nuts (DIN 508) manufactured in Property Class 12.9 Steel (ISO 898-1 property class 12.9) are dimensioned to DIN 508. The sections below give the mechanical and physical properties of the grade, its behavior in corrosive and elevated-temperature service, and the full size table.
Why Choose Property Class 12.9 Steel for T-Slot Nuts (DIN 508)
The highest common strength class, for high-load machine assembly. For t-slot nuts (din 508), 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 t-slot nuts (din 508) 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 T-Slot Nuts (DIN 508), 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 T-Slot Nuts (DIN 508) Available in Property Class 12.9 Steel
| Size | T-slot width a (mm) | Nut width b (mm) | Total height h (mm) | Neck height k (mm) | Chamfer f (mm) | Reference standard |
|---|---|---|---|---|---|---|
| M4 | 5 | 9 | 6.5 | 3 | 1 | DIN 508 |
| M5 | 6 | 10 | 8 | 4 | 1.6 | DIN 508 |
| M6 | 8 | 13 | 10 | 6 | 1.6 | DIN 508 |
| M8 | 10 | 15 | 12 | 6 | 1.6 | DIN 508 |
| M10 | 12 | 18 | 14 | 7 | 2.5 | DIN 508 |
| M12 | 14 | 22 | 16 | 8 | 2.5 | DIN 508 |
| M16 | 18 | 28 | 20 | 10 | 2.5 | DIN 508 |
| M20 | 22 | 35 | 28 | 14 | 2.5 | DIN 508 |
| M24 | 28 | 44 | 36 | 18 | 4 | DIN 508 |
| M30 | 36 | 54 | 44 | 22 | 6 | DIN 508 |
| M36 | 42 | 65 | 52 | 26 | 6 | DIN 508 |
| M42 | 48 | 75 | 60 | 30 | 6 | DIN 508 |
| M48 | 54 | 85 | 70 | 34 | 6 | DIN 508 |
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. Thread, height, across-flats, property class, locking feature and flange form can all be varied, including thread sizes the standard series does not run to. Made by cold heading or tapping.
Minimum order from 2,000 pieces; samples within 7 days of drawing approval.
