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.