For Phillips Pan Head Self-Tapping Screw — GB/T 845 / ISO 7049 (Series 032) in Grade 12.9 Steel, the controlling decisions are corrosion, strength and service temperature. This guide summarizes those three for Grade 12.9 Steel Phillips Pan Head Self-Tapping Screw — GB/T 845 / ISO 7049 (Series 032) and lists every size we supply.
Why Choose Grade 12.9 Steel for Phillips Pan Head Self-Tapping Screw — GB/T 845 / ISO 7049 (Series 032)
The highest common strength class, for high-load machine assembly. For phillips pan head self-tapping screw — gb/t 845 / iso 7049 (series 032), this matters when requires plating or black-oxide protection is the primary requirement.
Mechanical & Physical Properties
| Grade designation | class 12.9 |
|---|---|
| Magnetic response | Magnetic |
| Service temperature | up to approx. +300 °C |
| Corrosion characteristic | Requires plating or black-oxide protection |
Galvanic & Galling Considerations
For phillips pan head self-tapping screw — gb/t 845 / iso 7049 (series 032) 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.
Comparable Grades
For Phillips Pan Head Self-Tapping Screw — GB/T 845 / ISO 7049 (Series 032), 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 Phillips Pan Head Self-Tapping Screw — GB/T 845 / ISO 7049 (Series 032) Available in Grade 12.9 Steel
| Size | Pitch (mm) | Length L (mm) | Head diameter dk (mm) | Head height k (mm) | Cross recess | Reference standard |
|---|---|---|---|---|---|---|
| M3 | 0.5 | 20 | 5.6 | 1.8 | PH1 | ISO 7045 / GB/T 818 |
| M4 | 0.7 | 25 | 8.0 | 2.4 | PH2 | ISO 7045 / GB/T 818 |
| M5 | 0.8 | 30 | 9.5 | 3.0 | PH2 | ISO 7045 / GB/T 818 |
| M6 | 1.0 | 40 | 12.0 | 3.6 | PH3 | ISO 7045 / GB/T 818 |
| M8 | 1.25 | 50 | 16.0 | 4.8 | PH3 | ISO 7045 / GB/T 818 |
| M10 | 1.5 | 60 | 20.0 | 6.0 | PH4 | ISO 7045 / GB/T 818 |