Specifying Phillips Pan Head Self-Tapping Screw — GB/T 845 / ISO 7049 (Series 032) in A4 Stainless Steel pairs the dimensional form of Phillips Pan Head Self-Tapping Screw — GB/T 845 / ISO 7049 (Series 032) (GB/T 845 / ISO 7049) with the engineering properties of A4 Stainless Steel. This page explains when to choose the grade, how it behaves in service, and which grades to compare it against.
Why Choose A4 Stainless Steel for Phillips Pan Head Self-Tapping Screw — GB/T 845 / ISO 7049 (Series 032)
Specified for marine, coastal and chemical applications. For phillips pan head self-tapping screw — gb/t 845 / iso 7049 (series 032), this matters when superior, including marine and chloride environments is the primary requirement.
Mechanical & Physical Properties
| Grade designation | A4-80 (316) |
|---|---|
| Magnetic response | Largely non-magnetic |
| Service temperature | approx. -200 °C to +400 °C |
| Corrosion characteristic | Superior, including marine and chloride environments |
Corrosion Behavior in Service
A4 (316) adds 2–3% molybdenum to the A2 (304) composition, which dramatically improves resistance to chloride-pitting corrosion. For Phillips Pan Head Self-Tapping Screw — GB/T 845 / ISO 7049 (Series 032) in marine, coastal, swimming-pool or food-processing environments, A4 is the default selection.
Comparable Grades
For Phillips Pan Head Self-Tapping Screw — GB/T 845 / ISO 7049 (Series 032), the alternative stainless grade is A2 (304). A2 (304) suits general indoor and outdoor service; A4 (316) adds molybdenum for marine and chloride environments. Where higher strength matters more than corrosion, switch to plated alloy-steel class 8.8 or 10.9.
Sizes of Phillips Pan Head Self-Tapping Screw — GB/T 845 / ISO 7049 (Series 032) Available in A4 Stainless 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 |