A4 Stainless Steel (ISO 3506 group A4 (316 / 1.4401), commonly supplied A4-80) is specified for marine, coastal and chemical applications. When phillips pan head machine screws with collar are specified in this grade, the dimensions remain per DIN 967; the material determines corrosion behavior (superior, including marine and chloride environments) and the service temperature range (approx. -200 °C to +400 °C, subject to the property class and the joint). Both are covered below with the size table.
Why Choose A4 Stainless Steel for Phillips Pan Head Machine Screws with Collar
Specified for marine, coastal and chemical applications. For phillips pan head machine screws with collar, 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 machine screws with collar: (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 Machine Screws with Collar, the alternative stainless grade is A2 (304). Choose A2 (304) for general use and A4 (316) wherever chlorides are present; the molybdenum in A4 is the whole difference. Remember that stainless is the corrosion answer, not the strength answer — for load, look at class 8.8 or 10.9 instead.
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 Machine Screws with Collar Available in A4 Stainless Steel
| Size | Pitch P (mm) | b (mm) | c (mm) | da (mm) | Head diameter dk (mm) | r (mm) | Head height k (mm) | rf (mm) | x (mm) | cT (mm) | mH (mm) | mZ (mm) | Length range l (mm) | Reference standard |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| M3 | 0.5 | 25.0 | 0.7 | 3.6 | 7.5 | 0.1 | 2.35 | 3.8 | 1.25 | 1 | 3.0 | 2.9 | 4~30 | DIN 967 |
| (M3.5) | 0.6 | 38.0 | 0.8 | 4.1 | 9.0 | 0.1 | 2.6 | 4.6 | 1.5 | 2 | 4.2 | 3.9 | 5~35 | DIN 967 |
| M4 | 0.7 | 38.0 | 1.0 | 4.7 | 10.0 | 0.2 | 3.05 | 5.8 | 1.75 | 2 | 4.6 | 4.3 | 5~40 | DIN 967 |
| M5 | 0.8 | 38.0 | 1.2 | 5.7 | 11.5 | 0.2 | 3.55 | 6.6 | 2.0 | 2 | 5.0 | 4.7 | 6~45 | DIN 967 |
| M6 | 1.0 | 38.0 | 1.6 | 6.8 | 14.5 | 0.25 | 4.55 | 8.2 | 2.5 | 3 | 7.1 | 6.7 | 8~60 | DIN 967 |
| M8 | 1.25 | 38.0 | 2.0 | 9.2 | 19.0 | 0.4 | 5.9 | 11.0 | 3.2 | 4 | 9.0 | 8.8 | 10~60 | DIN 967 |
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. Lengths and thread lengths outside the standard table are the commonest request, followed by a drive the standard does not offer and a head marked with your own part number. Made by cold heading or warm forging.
Minimum order from 2,000 pieces; samples within 7 days of drawing approval.
