A4 Stainless Steel Phillips Pan Head Wood Screws, Metric combine the dimensional form of DIN 7996 with the material properties of grade ISO 3506 group A4 (316 / 1.4401), commonly supplied A4-80: superior, including marine and chloride environments, largely non-magnetic, service range approx. -200 °C to +400 °C, subject to the property class and the joint. This page summarizes the grade data, its corrosion behavior in service, the comparable grades, and the sizes supplied.
Why Choose A4 Stainless Steel for Phillips Pan Head Wood Screws, Metric
Specified for marine, coastal and chemical applications. For phillips pan head wood screws, metric, this matters when superior, including marine and chloride environments is the primary requirement.
Mechanical & Physical Properties
| Grade designation | ISO 3506 group A4 (316 / 1.4401), commonly supplied A4-80 |
|---|---|
| Magnetic response | Largely non-magnetic |
| Service temperature | approx. -200 °C to +400 °C, subject to the property class and the joint |
| Corrosion characteristic | Superior, including marine and chloride environments |
Galvanic & Galling Considerations
Two important notes for stainless phillips pan head wood screws, metric: (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.
Comparable Grades
For Phillips Pan Head Wood Screws, Metric, the alternative stainless grade is A2 (304). A2 (304) covers general indoor and outdoor service. A4 (316) adds molybdenum, which is what buys the chloride resistance for marine and de-icing-salt exposure. Where strength matters more than corrosion, plated alloy steel in class 8.8 or 10.9 is the swap to make.
Using Stainless Fasteners in Aluminum
Expect the aluminum to corrode, not the fastener — stainless sits higher in the galvanic series, so the aluminum is the one that gives up material. A small fastener in a thick section spreads the loss over a large area and is usually fine; a large fastener in thin sheet concentrates it and is not. Keep water out of the joint, or isolate the two metals with a nylon or coated washer and a sealant.
Sizes of Phillips Pan Head Wood Screws, Metric Available in A4 Stainless Steel
| Size | Head diameter dk (mm) | Head height k (mm) | da (mm) | r (mm) | d3 (mm) | Pitch P (mm) | Cross recess size | m (mm) | e (mm) | Length range l (mm) | Reference standard |
|---|---|---|---|---|---|---|---|---|---|---|---|
| 2 mm | 4 | 1.4 | 2.8 | 1.6 | 1.4 | 0.9 | 0 | 2.1 | 0.75 | 11~13 | DIN 7996 |
| 2.5 mm | 5 | 1.7 | 3.3 | 2.0 | 1.7 | 1.1 | 1 | 2.3 | 0.85 | 10~30 | DIN 7996 |
| 3 mm | 6 | 2.1 | 3.8 | 2.4 | 2.1 | 1.35 | 1 | 2.7 | 1.3 | 10~40 | DIN 7996 |
| 3.5 mm | 7 | 2.35 | 4.3 | 2.8 | 2.4 | 1.6 | 2 | 3.7 | 1.22 | 10~45 | DIN 7996 |
| 4 mm | 8 | 2.8 | 5.0 | 3.2 | 2.8 | 1.8 | 2 | 4.1 | 1.62 | 12~50 | DIN 7996 |
| 4.5 mm | 9 | 3.1 | 5.5 | 3.6 | 3.1 | 2.0 | 2 | 4.4 | 1.88 | 16~60 | DIN 7996 |
| 5 mm | 10 | 3.5 | 6.0 | 4.0 | 3.5 | 2.2 | 2 | 4.8 | 2.28 | 16~80 | DIN 7996 |
| 5.5 mm | 11 | 3.8 | 6.6 | 4.4 | 3.5 | 2.2 | 2 | 4.8 | 2.28 | 11~13 | DIN 7996 |
| 6 mm | 12 | 4.2 | 7.2 | 4.8 | 4.2 | 2.6 | 3 | 6.6 | 2.82 | 40~80 | DIN 7996 |
| 7 mm | 14 | 4.9 | 8.2 | 5.6 | 4.9 | 3.2 | 3 | 7.3 | 3.52 | 11~13 | DIN 7996 |
| 8 mm | 16 | 5.6 | 10.2 | 6.4 | 5.6 | 3.6 | 4 | 8.8 | 3.93 | 11~13 | DIN 7996 |
Dimensions are independent of the material: every size above is available in A4 Stainless Steel.
Custom manufacturing · Made to drawing
Need this screw in a grade that is not listed?
A4 Stainless Steel is one of the grades the catalog describes. A non-standard screw is quoted from the drawing; where one already exists in the catalog, the special is usually a variation on its tooling. Made by cold heading or warm forging.
Minimum order from 2,000 pieces; samples within 7 days of drawing approval.
