For Phillips Pan Head Self-Tapping Screw — GB/T 845 / ISO 7049 (Series 032) in Grade 8.8 Steel, the controlling decisions are corrosion, strength and service temperature. This guide summarizes those three for Grade 8.8 Steel Phillips Pan Head Self-Tapping Screw — GB/T 845 / ISO 7049 (Series 032) and lists every size we supply.
Why Choose Grade 8.8 Steel for Phillips Pan Head Self-Tapping Screw — GB/T 845 / ISO 7049 (Series 032)
The workhorse medium-carbon alloy grade for structural joints. For phillips pan head self-tapping screw — gb/t 845 / iso 7049 (series 032), this matters when requires plating (zinc) for corrosion protection is the primary requirement.
Mechanical & Physical Properties
| Grade designation | class 8.8 |
|---|---|
| Magnetic response | Magnetic |
| Service temperature | up to approx. +300 °C |
| Corrosion characteristic | Requires plating (zinc) for corrosion protection |
Corrosion Behavior in Service
Carbon and alloy steel phillips pan head self-tapping screw — gb/t 845 / iso 7049 (series 032) 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 Phillips Pan Head Self-Tapping Screw — GB/T 845 / ISO 7049 (Series 032), class 10.9 or 12.9 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 8.8 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 |