INCONEL 625 WASHERS - UNS N06625 / W.NR. 2.4856
■ Metric Standard Flat Washers (DIN 125 Form A / ISO 7089)
| NOMINAL SIZE |
INSIDE DIAMETER (mm) |
OUTSIDE DIAMETER (mm) |
THICKNESS (mm) |
| M6 |
6.4 |
12.0 |
1.6 |
| M8 |
8.4 |
16.0 |
1.6 |
| M10 |
10.5 |
20.0 |
2.0 |
| M12 |
13.0 |
24.0 |
2.5 |
| M16 |
17.0 |
30.0 |
3.0 |
| M20 |
21.0 |
37.0 |
3.0 |
| M24 |
25.0 |
44.0 |
4.0 |
■ Metric Large / Fender Washers (DIN 9021 / ISO 7093)
| NOMINAL SIZE |
INSIDE DIAMETER (mm) |
OUTSIDE DIAMETER (mm) |
THICKNESS (mm) |
| M6 |
6.4 |
18.0 |
1.6 |
| M8 |
8.4 |
24.0 |
2.0 |
| M10 |
10.5 |
30.0 |
2.5 |
| M12 |
13.0 |
37.0 |
3.0 |
| M16 |
17.0 |
50.0 |
3.0 |
| M20 |
22.0 |
60.0 |
4.0 |
| M24 |
26.0 |
72.0 |
5.0 |
Engineering Note: DIN 9021 large washers are explicitly engineered to distribute loads over a significantly larger bearing surface, which is critical when bolting into softer flange materials or oversized/slotted holes.
■ Helical Spring Lock Washers (DIN 127 Form B)
| NOMINAL SIZE |
INNER DIAMETER Min (mm) |
OUTER DIAMETER Max (mm) |
THICKNESS (mm) |
| M6 |
6.1 |
11.8 |
1.6 |
| M8 |
8.1 |
14.8 |
2.0 |
| M10 |
10.2 |
18.1 |
2.2 |
| M12 |
12.2 |
21.1 |
2.5 |
| M16 |
16.2 |
27.4 |
3.5 |
| M20 |
20.2 |
33.6 |
4.0 |
■ Washer-Specific Technical Specifications
| Material Advantage |
Inconel 625 (UNS N06625). Exceptional yield strength derived from solid-solution stiffening (Mo & Nb) without needing precipitation-hardening. Reliable from cryogenic (-320°F) up to 1800°F (982°C). |
| Mechanical Properties |
- Hardness (Annealed): ~22 HRC (approx. 220 HB).
- Corrosion: Complete immunity to chloride-ion stress-corrosion cracking (SCC).
- Thermal Dynamics: Undergoes a sluggish precipitation hardening when exposed to 1200°F - 1600°F over extended durations, increasing yield strength over time.
|
| Imperial Equivalents (ASME B18.22.1) |
- USS (United States Standard): Larger outer diameter and thicker profile for standard industrial flange bolting.
- SAE (Society of Automotive Engineers): Tighter inner/outer diameters for assemblies with strict radial clearances.
|
| Primary Engineering Functions |
Provides a hardened, highly predictable sliding surface that prevents under-head friction from absorbing applied torque. Ensures uniform thermal expansion across the joint and actively mitigates galvanic corrosion when mated with matching Alloy 625 bolts and nuts. |
