A4 Stainless Steel Phillips Pan Head Machine Screw — GB/T 818 / ISO 7045 (Series 034) pairs the standard GB/T 818 / ISO 7045 with a A4 Stainless Steel base material. The sections below cover why engineers select this grade for phillips pan head machine screw — gb/t 818 / iso 7045 (series 034), its corrosion and temperature behavior, and the sizes available.
Why Choose A4 Stainless Steel for Phillips Pan Head Machine Screw — GB/T 818 / ISO 7045 (Series 034)
Specified for marine, coastal and chemical applications. For phillips pan head machine screw — gb/t 818 / iso 7045 (series 034), 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 Machine Screw — GB/T 818 / ISO 7045 (Series 034) in marine, coastal, swimming-pool or food-processing environments, A4 is the default selection.
Galvanic & Galling Considerations
Two important notes for stainless phillips pan head machine screw — gb/t 818 / iso 7045 (series 034): (1) stainless can gall on stainless threads under load — use a thread lubricant or anti-galling compound, especially for M6 and below; (2) when joined to aluminum or galvanized steel, stainless can drive galvanic corrosion of the less-noble metal in wet service — isolate with a coating or sleeve where appropriate.
Sizes of Phillips Pan Head Machine Screw — GB/T 818 / ISO 7045 (Series 034) 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 |