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Products - Washer Index - Nord Lock Wedge Lock Washer
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Nord-Lock washer material / type guide
| Application parameter | Steel washers | Stainless steel (ss) washers | SMO254 washers | INCONEL®/ HASTELLOY® C-276 washers | INCONEL® 718 washers |
|---|---|---|---|---|---|
| Steel type | EN 1.7182 or equivalent | EN 1.4404 or equivalent | EN 1.4547 or equivalent | EN 2.4819 or equivalent | EN 2.4667 or equivalent |
| Examples of applications | General steel applications | General stainless steel applications. Non chlorine / acid environments | General salt water applications, pumps, chloride applications, heat exchangers, nuclear, desalination, food processing & medical equipment | General acidic environments, process and chemical industry, evaporators, offshore downhole tooling | Applications with high temperatures, gas turbines, turbo charges, incinerators |
| Available for bolt sizes | M3-M130 (see page 8 for dimensions) | M3-M80 (see page 10 for dimensions) | M3-M39 (see page 11 for dimensions) | M3-M39 available upon request | M3-M39 available upon request |
| Washer types | Regular outer diameter (NL3–NL130) Enlarged outer diameter (NL3,5sp–NL36sp) | Regular outer diameter (NL3ss–NL80ss) Enlarged outer diameter (NL3,5spss–NL30spss) | Regular outer diameter (NL3ss-254–NL39ss-254) Enlarged outer diameter (NL3,5spss-254– NL27spss-254) | Regular outer diameter (NL3ss-276–NL39ss-276) Enlarged outer diameter (NL3,5spss-276– NL27spss-276) | Regular outer diameter (NL3ss-718–NL39ss-718) Enlarged outer diameter (NL3,5spss-718– NL27spss-718) |
| Treatment Surface coating | Through hardened Delta Protekt® base coat (KL100) and top coat (VH302GZ) | Surface hardened | Surface hardened | Surface hardened | Surface hardened |
| Washer hardness* | = 465 HV1 | = 520HV0,05 | = 600HV0,05 | = 520HV0,05 | = 620HV0,05 |
| Corrosion resistance | Minimum 600 hours in salt spray test (according to IS09227) | PREN 27** | PREN 45** | PREN 68** | PREN 29** |
| Bolt grades | Up to 12.9 | Up to A4-80 | Up to A4-80 | Up to A4-80 | Up to A4-80 |
| Temperature range*** | -20°C to 200°C | -160°C to 500°C | -160°C to 500°C | -160°C to 500°C | -160°C to 700°C |
* In order to assure the unique mechanical locking function of the Nord-Lock washers, the hardness of the mating surfaces must be lower than the hardness of the Nord-Lock washers (see table above).
** PREN (Pitting Resistance Equivalent Number) = %Cr + 3,3x%Mo + 16x%N. Figures in table valid for base material.
*** Temperature recommendations based on information from the raw material supplier. Locking function not affected within the specification.