Specification Sheet

7
Nord-Lock washer material / type guide
Steel type (EN)
1.7182 or equivalent 1.4404 or equivalent 1.4547 or equivalent 2.4819 or equivalent 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
Application
parameter
Steel
washers
Stainless steel (ss)
washers
254 SMO
®
washers
INCONEL
®
/
HASTELLOY
®
C-276 washers
INCONEL
®
718
washers
* 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. A higher PRE number
indicates better corrosion resistance.
*** Temperature recommendations based on information from the raw material supplier. Locking function not affected within
the specification.