A2 Stainless Steel Hex Washer Flange Self-Drilling Screws are supplied to Trade series (hex washer flange self-drilling screws). The grade provides good general corrosion resistance and is largely non-magnetic; the practical service range is approx. -200 °C to +400 °C, subject to the property class and the joint. Property data, grade comparison and the full size table follow.
Why Choose A2 Stainless Steel for Hex Washer Flange Self-Drilling Screws
The most common stainless group for indoor and general outdoor fasteners. For hex washer flange self-drilling screws, this matters when good general corrosion resistance is the primary requirement.
Mechanical & Physical Properties
| Grade designation | ISO 3506 group A2 (304 / 1.4301), commonly supplied A2-70 |
|---|---|
| Magnetic response | Largely non-magnetic |
| Service temperature | approx. -200 °C to +400 °C, subject to the property class and the joint |
| Corrosion characteristic | Good general corrosion resistance |
Corrosion Behavior in Service
A2 (304) gives excellent atmospheric and most-water corrosion resistance and is the most common stainless for Hex Washer Flange Self-Drilling Screws in indoor and general outdoor service. In chloride-bearing environments (marine air, road salt, swimming pools) consider stepping up to A4 (316).
Galvanic & Galling Considerations
Two important notes for stainless hex washer flange self-drilling screws: (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.
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 Hex Washer Flange Self-Drilling Screws Available in A2 Stainless Steel
| Head form | Bearing surface | Point | Substrate | Typical use |
|---|---|---|---|---|
| hex washer head | integral flange | integrated drill point | metal sheet | metal roofing and cladding |
| hex washer head | integral flange | integrated drill point | thin structural members | solar mounting brackets |
| hex washer head | integral flange | integrated drill point | structural steel to sheet | structural assemblies |
