Alloy 42 (Pernifer® 40, NILO® 42, Glass Sealing 42®) Round Bar | Rod

Alloy 42 (UNS K94100), a nickel-iron alloy, with a virtually constant low rate of thermal expansion at temperatures up to 650°F (343°C) is in stock at EFINEA  We supply Alloy 42 in various round bar and rod diameters for your convenience in our New Jersey and California locations. Our inventory of bar diameters range from 0.125 to 2.000 inches.


Alloy 42 Round Bar and Rod In Stock and Ready to Ship

EFINEA also supplies wire rod for our customers, in diameters 0.312 inch and lighter. Don’t see the diameter you want?  Let us know what diameter you require and we will draw it down, cut it to length and precision grind to suit your application.


We partner with several qualified specialty suppliers to produce less than melt quantities of Alloy 42, in the configuration you desire, such as larger diameter rod, plate, forged rings, rectangles.


Do you need your Alloy 42 bar in a hurry? Not a problem. Talk to us and tell us what you need. Let the team at EFINEA provide you with our competitive pricing and show you how we can fulfill your needs. All standard stock alloys from EFINEA ship within twenty-four hours of your order confirmation. Our motto at EFINEA is “The materials you need, when you need them.” Call us today!

Below please find a sampling of our standard stock items. Our inventory fluctuates based on market demands. If you do not see the size or form you require, we ask that you call us for current product availability.
MaterialFormSize InchesSKU Number
Alloy 42Round Bar | Rod0.125”42NI-RD-125
Alloy 42Round Bar | Rod0.187”42NI-RD-187
Alloy 42Round Bar | Rod0.250”42NI-RD-250
Alloy 42Round Bar | Rod0.375”42NI-RD-375
Alloy 42Round Bar | Rod0.500”42NI-RD-500
Alloy 42Round Bar | Rod0.750”42NI-RD-750
Alloy 42Round Bar | Rod1.000”42NI-RD-1.000
Alloy 42Round Bar | Rod1.070”42NI-RD-1.070
Alloy 42Round Bar | Rod1.250”42NI-RD-1.250
Alloy 42Round Bar | Rod1.500”42NI-RD-1.500
Alloy 42Round Bar | Rod1.750”42NI-RD-1.750
Alloy 42Round Bar | Rod2.000”42NI-RD-2.000

For an EFINEA Alloy 42 data sheet, or any other Controlled Expansion Alloy data sheets, please go to the Data Sheets section in our Technical Library.