A2 Stainless Steel Channel (Strut) Nuts with Spring combine the dimensional form of Trade series (strut channel nut) with the material properties of grade ISO 3506 group A2 (304 / 1.4301), commonly supplied A2-70: good general corrosion resistance, 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 A2 Stainless Steel for Channel (Strut) Nuts with Spring
The most common stainless group for indoor and general outdoor fasteners. For channel (strut) nuts with spring, 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 |
Galvanic & Galling Considerations
Two important notes for stainless channel (strut) nuts with spring: (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 Channel (Strut) Nuts with Spring, the alternative stainless grade is A4 (316). 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 Channel (Strut) Nuts with Spring Available in A2 Stainless Steel
| Thread size | For channel width (mm) | Nut width (mm) | Nut height (mm) | Spring | Slot engagement | Material | Finish |
|---|---|---|---|---|---|---|---|
| M6 | 41 | 41 | 13 | Long spring | Grooved both ends | Steel | Zinc plated |
| M8 | 41 | 41 | 13 | Long spring | Grooved both ends | Steel | Zinc plated |
| M10 | 41 | 41 | 13 | Long spring | Grooved both ends | Steel | Hot-dip galvanised |
| M12 | 41 | 41 | 13 | Long spring | Grooved both ends | Steel | Hot-dip galvanised |
| M8 | 21 | 21 | 9 | Short spring | Grooved both ends | Steel | Zinc plated |
| M10 | 41 | 41 | 13 | No spring | Grooved both ends | A4 stainless | Passivated |
