A2 Stainless Steel (ISO 3506 group A2 (304 / 1.4301), commonly supplied A2-70) is the most common stainless group for indoor and general outdoor fasteners. Specified on snap-in nuts it determines the corrosion behaviour (good general corrosion resistance) and the service temperature range (approx. -200 °C to +400 °C, subject to the property class and the joint); the dimensions are ours rather than a standard's, and are listed in full below.
Why Choose A2 Stainless Steel for Snap-In Nuts
The most common stainless group for indoor and general outdoor fasteners. For snap-in nuts, 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 Snap-In Nuts 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 snap-in nuts: (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
The galvanic couple here runs the wrong way: aluminum is the less noble metal, so it corrodes and the fastener does not. What governs the rate is the ratio of areas — a large anode and a small cathode is a tolerable combination, the reverse concentrates the attack into thin material around the hole. An isolating washer plus sealant breaks the circuit; where that is impractical, match the fastener to the substrate.
Sizes of Snap-In Nuts Available in A2 Stainless Steel
| Thread / type | Panel thickness range (in) | Square hole (in) | Outside diameter (in) | Width (in) | Height (in) | Material / temperature |
|---|---|---|---|---|---|---|
| No. 6 nylon | 0.032~0.150 | 0.280~0.285 | 1/2 | 11/32 | 23/32 | off-white nylon; 165 °F maximum |
| 6-32 steel | 0.025~0.156 | 0.375~0.380 | 0.52 or 0.54 | zinc-plated steel | ||
| 8-32 steel | 0.025~0.156 | 0.375~0.380 | 0.52 or 0.54 | zinc-plated steel | ||
| 10-24 steel | 0.025~0.156 | 0.375~0.380 | 0.52 or 0.54 | zinc-plated steel | ||
| 10-32 steel | 0.025~0.156 | 0.375~0.380 | 0.52 or 0.54 | zinc-plated steel | ||
| 12-24 steel | 0.025~0.156 | 0.375~0.380 | 0.52 or 0.54 | zinc-plated steel | ||
| 1/4-20 steel | 0.025~0.156 | 0.375~0.380 | 0.52 or 0.54 | zinc-plated steel |
Dimensions are independent of the material: every size above is available in A2 Stainless Steel.
Custom manufacturing · Made to drawing
Need this nut in a grade that is not listed?
A2 Stainless Steel is one of the grades the catalog describes. Thread size is the obvious variable and rarely the interesting one — height for clearance, across-flats for the tool already in the cell, and the locking feature for the vibration actually present. Made by cold heading or tapping.
Minimum order from 2,000 pieces; samples within 7 days of drawing approval.
