Low expansion Alloy 42 delivered throughout France
(Nilo 42)

A nickel-iron controlled-expansion alloy containing 42% Nickel. It has a low and nominally constant coefficient of thermal expansion in the 85 deg F (20 deg C) to 570 deg F (300 deg C) temperature range.

Typical application: Medical, electronics, automotive industries in various applications including bi-metals thermostat strips, thermostat rods, electronic tubes, glass to metal and ceramic to metal seals.

To view Low Expansion Alloy 42 (Nilo 42) chemical analysis, specification or shapes & sizes please click on the tabs below.

Our Alloy42 is available in bar and hollow bar.

Colour Code:
Colour Code
This product appears in:


Rounds (mm) Dia
50.80
63.50
76.20
82.55
88.90
101.60
114.30
127.00
133.35
146.05
152.40
165.10
177.80
203.20
215.90
222.25
235.00
300.00

The above is our standard size range. If you do not see the shape, size or grade you require, please contact us as we will be happy to assist you with reaching your requirements.

Our team work with many companies throughout France. Although we reference this material as Alloy 42 or Nilo 42, it is also known under the following reference names:

  • 1.3917
  • FeNi42
  • Invar 42

We provide prompt delivery to the UK for our Alloy 42 from our facilities in Ireland.

EN NumberUNSASTM
1.3917K94100F30
NiCrMnPSCrSiAICoFe
42.05.80.025.025.2500.03.02.05Bal

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