Nilo 42, also referred to as Alloy 42 or Invar 42, is a controlled-expansion nickel-iron alloy containing approximately 42 % nickel. This unique formulation gives the material a very low and nearly constant coefficient of thermal expansion from room temperature to around 300 °C. Under the UNS identification, it is known as K94100, and according to European standards, its Werkstoff number is 1.3917. In mechanical terms, annealed Nilo 42 exhibits a tensile strength of about 490 MPa (71,000 psi) and a yield strength around 250 MPa (36,000 psi).

One of the key strengths of Nilo 42 lies in its stable and low coefficient of thermal expansion, which ensures dimensional precision even across temperature fluctuations. This dimensional stability makes it ideal for critical precision engineering environments. The alloy also offers excellent machinability and workability, enabling tight tolerances during fabrication. Further, its strength and toughness remain reliable over a wide temperature range, while its iron-nickel structure ensures good thermal conductivity and reasonable corrosion resistance. Because of these properties, Nilo 42 maintains its integrity in sealing applications, structural tooling, and precision instruments.

At SMM Industries LLP, as a trusted Nilo 42 Round Bars Manufacturer, we ensure strict adherence to industry standards such as ASTM F30 and UNS K94100. Our production processes are aligned with international quality systems so that each round bar meets the high mechanical and thermal criteria demanded by modern precision industries.

Nilo 42 Round Bars find utility in a range of critical applications where thermal stability and mechanical strength are vital:

• Bi-metal thermostat strips: low expansion coefficient ensures responsive and durable temperature control.

• Thermostat rods: precise dimensional stability helps in temperature-sensitive assemblies.

• Semiconductor lead frames: limited thermal expansion aligns with semiconductor materials, improving performance.

• Glass-to-metal seals: used in feedthroughs and hermetic designs for vacuum tubes and electronic packages.

• Ceramic-to-metal seals: compatible expansion for ceramic hermetic packages, such as alumina ceramics.

• Precision tooling: tooling for carbon-fibre composites in aerospace or motorsport benefits from minimal distortion.

• Optical components: stable under thermal cycling, ensuring precision in mirrors or mounts.

• Electronic vacuum devices: ideal for sealing applications in fluorescent lights, TV tubes, or radio valves.

As an experienced Nilo 42 Round Bars Supplier, we maintain a robust inventory of bar diameters, lengths, and finishes to cater to a wide variety of engineering demands. Whether you need cold-drawn, centreless ground, or polished round bars, SMM Industries LLP can accommodate your requirements efficiently.

As a committed Nilo 42 Round Bars Stockist, SMM Industries LLP retains a broad stock of Nilo 42 in various forms—round bars, rods, and other profiles—so that clients benefit from rapid turnaround times without compromising on quality or specification.

We also serve as a dedicated Nilo 42 Round Bars Exporter, supplying customers across key international markets. Our streamlined export operations ensure timely deliveries while complying with global shipping and quality standards.

Globally, Nilo 42 is recognized under various standards and names: ASTM / ASME: ASTM F30 for bar, sheet, rod, UNS: K94100, EN (European): Werkstoff No. 1.3917, French standard: AFNOR NF A54-301, German DIN standard: DIN 17745, ASTM / ASME Grade Our Nilo 42 Round Bars conform to ASTM F30 grade as per UNS K94100 specification, ensuring consistent thermal expansion behaviour and mechanical performance.

With deep expertise in precision alloys, SMM Industries LLP delivers superior quality Nilo 42 Round Bars tailored for demanding industries. Our adherence to international ASTM F30 / UNS K94100 / EN 1.3917 standards ensures that your components perform reliably in high-precision thermal environments. We combine strong inventory, global reach, and responsive service to serve as a comprehensive partner in every step—from manufacturing and stocking to exporting.