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. When push-button quick-adjust nuts are specified in this grade, the dimensions remain per Trade series (quick-adjust half nut); the material determines corrosion behavior (good general corrosion resistance) 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 A2 Stainless Steel for Push-Button Quick-Adjust Nuts
The most common stainless group for indoor and general outdoor fasteners. For push-button quick-adjust 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 |
Galvanic & Galling Considerations
Two important notes for stainless push-button quick-adjust 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.
Comparable Grades
For Push-Button Quick-Adjust Nuts, the alternative stainless grade is A4 (316). 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 Push-Button Quick-Adjust Nuts Available in A2 Stainless Steel
| For rod thread | Body width (mm) | Body height (mm) | Holding force (N, typical) | Holding vs standard nut | Operation | Material | Use |
|---|---|---|---|---|---|---|---|
| M8 | 32 | 18 | 2500 | approx. 25% | Push button | Zinc alloy body, steel half nut | Jigs, adjustable frames |
| M10 | 38 | 20 | 4000 | approx. 25% | Push button | Zinc alloy body, steel half nut | Jigs, adjustable frames |
| M12 | 44 | 24 | 6000 | approx. 25% | Push button | Zinc alloy body, steel half nut | Clamping rigs |
| M16 | 54 | 28 | 10000 | approx. 25% | Push button | Zinc alloy body, steel half nut | Clamping rigs |
