Alloy 42 is a nickel iron alloy whose coefficient of expansion makes it suitable for joining to ceramic chips in miniature electronic circuits.

Alloy 52 is a nickel iron alloy whose coefficient of expansion closely mirrors soft glass. Applications for this product include magnetic reed switches and seals that need controlled linear expansion to approximately 525° C.

Typical Mechanical Properties

Alloy 42 Alloy 52
Annealed As Rolled Annealed As Rolled
Ultimate Tensile
Strength (PSI)
72,000 110,000 75,000 130,000
Yield Strength (PSI) 40,000 105,000 30,000 125,000
Elongation 35% 5% 30% 1%
Modulus of Elasticity (PSI) 21 x 10e6 24 x 10e6
Poisson’s Ratio 0.25 0.29

Typical Physical Properties

Alloy 42 Alloy 52
Density 0.293 lbs/cu in 0.300 lbs/cu in
Melting Point 1440° C 1425° C
Electrical Resistivity @ RT 70 Microhm-cm 43 Microhm-cm
Temp. Coefficient Resistivity
(20 to 100° C)
2500 PPM/°C 2900 PPM/°C
Thermal Expansion Coefficient
(30 to 400° C)
6.0 x 10e-6/°C 10.0 x 10e-6/°C


H. Cross Company can supply these products in all forms including wire, ribbon, strip, sheet and foil. See our Typical Dimensions and Tolerances page for further information. If you do not see the size range you require email or phone us for more information on our Contact page.