| Application parameter | ||||
| Steel | Stainless steel (ss) |
254 SMO® | ALLOY C-276 |
ALLOY 718 |
| Steel type | ||||
| EN 1.7182 | EN 1.4404 | EN 1.4547 | EN 2.4819 or equivalent | EN 2.4668 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 #5 to 5" |
M3-M80 #5 to 3 1/8" |
M3-M39 #5 to 1 1/2" |
M3-M39 available on request #5 to 1 1/2" available on request |
M3-M39 available on request #5 to 1 1/2" available on 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* | ||||
| ≥ 465HV1 | ≥ 520HV0,05 | ≥ 600HV0,05 | ≥ 520HV0,05 | ≥ 620HV0,05 |
| Corrosion resistance | ||||
| Minimum 1,000 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 | |||
| Temperature range*** | ||||
| -50°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.
** 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 and from tests. Locking function not affected within the specification.