Material specification page for fine-thread all-metal hex lock nuts 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 10513.
Why Choose A2 Stainless Steel for Fine-Thread All-Metal Hex Lock Nuts
The most common stainless group for indoor and general outdoor fasteners. For fine-thread all-metal hex lock 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 Fine-Thread All-Metal Hex Lock Nuts 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 All-Metal Hex Lock 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
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 All-Metal Hex Lock Nuts Available in A2 Stainless Steel
| Size | Pitch P (mm) | d_a_max (mm) | d_a_min (mm) | d_w_min (mm) | Width across corners e (mm) | h_max (mm) | h_min (mm) | m_w_min (mm) | Width across flats s (mm) | s_min (mm) | Reference standard |
|---|---|---|---|---|---|---|---|---|---|---|---|
| M8x1 | 1 | 8.75 | 8 | 11.63 | 14.38 | 8 | 7.14 | 5.15 | 13 | 12.73 | ISO 10513 |
| M10x1 | 1 | 10.8 | 10 | 14.63 | 17.77 | 10 | 8.94 | 6.43 | 16 | 15.73 | ISO 10513 |
| M10x1.25 | 1.25 | 10.8 | 10 | 14.63 | 17.77 | 10 | 8.94 | 6.43 | 16 | 15.73 | ISO 10513 |
| M12x1.25 | 1.25 | 13 | 12 | 16.63 | 20.03 | 13.3 | 11.57 | 8.3 | 18 | 17.73 | ISO 10513 |
| M12x1.5 | 1.5 | 13 | 12 | 16.63 | 20.03 | 13.3 | 11.57 | 8.3 | 18 | 17.73 | ISO 10513 |
| (M14x1.5) | 1.5 | 15.1 | 14 | 19.64 | 23.36 | 14.1 | 13.4 | 9.68 | 21 | 20.67 | ISO 10513 |
| M16x1.5 | 1.5 | 17.3 | 16 | 22.49 | 26.75 | 16.4 | 15.7 | 11.28 | 24 | 23.67 | ISO 10513 |
| M20x1.5 | 1.5 | 21.6 | 20 | 27.7 | 32.95 | 20.3 | 19 | 13.52 | 30 | 29.16 | ISO 10513 |
| M24x2 | 2 | 25.9 | 24 | 33.25 | 39.55 | 23.9 | 22.6 | 16.16 | 36 | 35 | ISO 10513 |
| M30x2 | 2 | 32.4 | 30 | 42.75 | 50.85 | 30 | 27.3 | 19.44 | 46 | 45 | ISO 10513 |
| M36x2 | 2 | 38.9 | 36 | 51.11 | 60.79 | 36 | 33.1 | 23.52 | 55 | 53.8 | ISO 10513 |
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.
