Nickel Iron Alloy 48/ Nilo 48 (ASTM F30)

Technical Data Sheet

Chemical Composition Limits
Weight % Ni Cr Mn Si C Al P S Fe
Alloy 48 48 0.25 max 0.80 max 0.30 max 0.05 max 0.10 max 0.025 max 0.025 max Bal

Alloy 48 (Nilo 48) is a nickel-iron controlled-expansion alloy containing 48% nickel. Alloy 48 (Nilo 48 coefficient of thermal expansion matches that of soft lead and soda lime glasses therefore Alloy 48's main use is for glass to metal seals in soft lead or soda lime type glasses. Alloy 48 is also used for thermostats in industrial applications up to 450°C (840°F).

Typical Mechanical Properties

Material Ultimate Tensile Strength Yield Strength 0.2 % Elongation (%)
psi MPa psi MPa
Alloy 48 75,000 520 38,000 260 43

Coefficient of Expansion - Alloy 48 (Nilo 48)
68-212°F, 10ˉ6 in/in °F 4.7
20-100°C, μ m/m °C 8.5
68-752 °F, 10ˉ6 in/in °F 4.6 / 5.2
20-400°C, μ m/m °C 8.3 / 9.3

Alloy 48 is available in Round Bar, Tube, Sheet, Coil, Strip and Wire. For all stock availability contact Sales.

Alloy 48 Tube is available the following size ranges.
Outside Diameter - 0.25mm (0.010") up to 16.00mm (0.625")
Wall - 0.05mm (0.002") up to 1.00mm (0.040")
Straight Lengths - 1.00mm (0.040") up to 5000.00mm (197")
Coils Lengths - 5 Metres to 15 Metres
Standard Tolerance- OD &ID +/-0.03mm (0.0012")
Wall +/- 10%
Tight Tolerance - OD&ID +/- 0.015mm (0.0006")
Wall +/-3%
Some thin wall tubes up to 25.40 mm (1.000") can be supplied.

Alloy 48 Strip in Coil Alloy 48 Sheet Alloy 48 Plate
0.010" 0.010" 0.200"
0.015" 0.015" 0.235"
0.020" 0.020" 0.250"
0.040" 0.070" 0.375"
0.060" 0.080" 0.450"
  0.135" 0.500"
many other sizes available

UNS K94800
ASTM F30 Sheet, Strip, Rod, Bar, Tubing and Wire
DIN 17745
Werkstoff Nr.1.3922
Werkstoff Nr. 1.3926
Werkstoff Nr. 1.3927
AFNOR NF A54-301
Tradename Nilo Alloy 48

At Aircraft Materials we specialise in the rapid turn-around of orders, with most stock items ready for shipping out the same day to anywhere in the world. For time-critical orders, such as AOGs use our AOG service desk (, the team are dedicated to processing and dispatching orders on the same day, even for cutting orders on bar and sheet products.

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Every effort is made to ensure that technical specifications are accurate. However, technical specifications included herein should be used as a guideline only. All specifications are subject to change without notice.