For phillips pan head machine screws with collar in Property Class 12.9 Steel, the controlling selection factors are corrosion exposure, strength requirement and service temperature. The grade data for Property Class 12.9 Steel (ISO 898-1 property class 12.9) is summarized below together with every size supplied.
Why Choose Property Class 12.9 Steel for Phillips Pan Head Machine Screws with Collar
The highest common strength class, for high-load machine assembly. For phillips pan head machine screws with collar, 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 phillips pan head machine screws with collar 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 phillips pan head machine screws with collar 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 Phillips Pan Head Machine Screws with Collar Available in Property Class 12.9 Steel
| Size | Pitch P (mm) | b (mm) | c (mm) | da (mm) | Head diameter dk (mm) | r (mm) | Head height k (mm) | rf (mm) | x (mm) | cT (mm) | mH (mm) | mZ (mm) | Length range l (mm) | Reference standard |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| M3 | 0.5 | 25.0 | 0.7 | 3.6 | 7.5 | 0.1 | 2.35 | 3.8 | 1.25 | 1 | 3.0 | 2.9 | 4~30 | DIN 967 |
| (M3.5) | 0.6 | 38.0 | 0.8 | 4.1 | 9.0 | 0.1 | 2.6 | 4.6 | 1.5 | 2 | 4.2 | 3.9 | 5~35 | DIN 967 |
| M4 | 0.7 | 38.0 | 1.0 | 4.7 | 10.0 | 0.2 | 3.05 | 5.8 | 1.75 | 2 | 4.6 | 4.3 | 5~40 | DIN 967 |
| M5 | 0.8 | 38.0 | 1.2 | 5.7 | 11.5 | 0.2 | 3.55 | 6.6 | 2.0 | 2 | 5.0 | 4.7 | 6~45 | DIN 967 |
| M6 | 1.0 | 38.0 | 1.6 | 6.8 | 14.5 | 0.25 | 4.55 | 8.2 | 2.5 | 3 | 7.1 | 6.7 | 8~60 | DIN 967 |
| M8 | 1.25 | 38.0 | 2.0 | 9.2 | 19.0 | 0.4 | 5.9 | 11.0 | 3.2 | 4 | 9.0 | 8.8 | 10~60 | DIN 967 |
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.
