Material specification page for fine adjustment set screws 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 DIN 913.
Why Choose Property Class 12.9 Steel for Fine Adjustment Set Screws
The highest common strength class, for high-load machine assembly. For fine adjustment set screws, 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 fine adjustment set 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 Fine Adjustment Set Screws, 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 Fine Adjustment Set Screws Available in Property Class 12.9 Steel
| Thread size | Pitch (mm) | Hex socket s (mm) | Travel per turn (mm) | Travel per 1/12 turn (mm) | Common length range (mm) | Reference standard |
|---|---|---|---|---|---|---|
| M4x0.5 | 0.5 | 2 | 0.50 | 0.042 | 4~20 | DIN 913 fine |
| M5x0.5 | 0.5 | 2.5 | 0.50 | 0.042 | 5~25 | DIN 913 fine |
| M6x0.75 | 0.75 | 3 | 0.75 | 0.063 | 6~30 | DIN 913 fine |
| M8x1 | 1.0 | 4 | 1.00 | 0.083 | 8~40 | DIN 913 fine |
| M10x1 | 1.0 | 5 | 1.00 | 0.083 | 10~50 | DIN 913 fine |
| M12x1.25 | 1.25 | 6 | 1.25 | 0.104 | 12~60 | DIN 913 fine |
| M16x1.5 | 1.5 | 8 | 1.50 | 0.125 | 16~60 | DIN 913 fine |
