Material specification page for fine-thread hex nuts, style 2 in A2 Stainless Steel. Covers the grade designation (ISO 3506 group A2 (304 / 1.4301), commonly supplied A2-70), corrosion and magnetic behavior, comparable grades and their trade-offs, and the sizes available to ISO 8674.
Why Choose A2 Stainless Steel for Fine-Thread Hex Nuts, Style 2
The most common stainless group for indoor and general outdoor fasteners. For fine-thread hex nuts, style 2, 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 Fine-Thread Hex Nuts, Style 2 in indoor and general outdoor service. In chloride-bearing environments (marine air, road salt, swimming pools) consider stepping up to A4 (316).
Comparable Grades
For Fine-Thread Hex Nuts, Style 2, the alternative stainless grade is A4 (316). The practical dividing line is chlorides: A2 (304) is fine until salt is involved, and A4 (316) exists for the cases where it is — coastal, marine and road-salt service. Neither reaches the strength of a plated class 8.8 or 10.9 fastener.
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 Fine-Thread Hex Nuts, Style 2 Available in A2 Stainless Steel
| Size | Pitch P (mm) | c (mm) | damax (mm) | dw (mm) | Width across corners e (mm) | Nut height m (mm) | mw (mm) | Width across flats s (mm) | Reference standard |
|---|---|---|---|---|---|---|---|---|---|
| M8x1 | 1.0 | 0.3 | 8.75 | 11.63 | 14.38 | 7.5 | 5.71 | 13.0 | ISO 8674 |
| M10x1 | 1.0 | 0.3 | 10.8 | 14.63 | 17.77 | 9.3 | 7.15 | 16.0 | ISO 8674 |
| M10x1.25 | 1.25 | 0.3 | 10.8 | 14.63 | 17.77 | 9.3 | 7.15 | 16.0 | ISO 8674 |
| M12x1.5 | 1.5 | 0.3 | 13.0 | 16.63 | 20.3 | 12.0 | 9.62 | 18.0 | ISO 8674 |
| M12x1.25 | 1.25 | 0.3 | 13.0 | 16.63 | 20.3 | 12.0 | 9.62 | 18.0 | ISO 8674 |
| (M14x1.5) | 1.5 | 0.3 | 15.1 | 19.64 | 23.36 | 14.1 | 10.72 | 21.0 | ISO 8674 |
| M16x1.5 | 1.5 | 0.4 | 17.3 | 22.49 | 26.75 | 16.4 | 12.56 | 24.0 | ISO 8674 |
| M18x1.5 | 1.5 | 0.4 | 19.5 | 24.85 | 29.56 | 17.6 | 13.52 | 27.0 | ISO 8674 |
| M20x1.5 | 1.5 | 0.4 | 21.6 | 27.7 | 32.95 | 20.3 | 15.2 | 30.0 | ISO 8674 |
| (M20x2) | 2.0 | 0.4 | 21.6 | 27.7 | 32.95 | 20.3 | 15.2 | 30.0 | ISO 8674 |
| (M22x1.5) | 1.5 | 0.4 | 23.7 | 31.35 | 37.29 | 21.8 | 16.4 | 34.0 | ISO 8674 |
| M24x2 | 2.0 | 0.4 | 25.9 | 33.25 | 39.5 | 23.9 | 18.08 | 36.0 | ISO 8674 |
| (M27x2) | 2.0 | 0.4 | 29.1 | 38.0 | 45.2 | 26.7 | 20.32 | 41.0 | ISO 8674 |
| M30x2 | 2.0 | 0.4 | 32.4 | 42.75 | 50.85 | 28.6 | 21.85 | 46.0 | ISO 8674 |
| (M33x2) | 2.0 | 0.4 | 35.6 | 46.55 | 55.37 | 32.5 | 24.72 | 50.0 | ISO 8674 |
| M36x3 | 3.0 | 0.4 | 38.9 | 51.11 | 60.79 | 34.7 | 26.48 | 55.0 | ISO 8674 |
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.
