Kolkata, India-based Neil Metals is a leading manufacturer and supplier of **Invar 42 Rods and Bars**, providing precision-ground nickel-iron alloy stock for exceptional dimensional stability. With strict quality control and up-to-date production methods, Neil Metals achieves conformity with specifications such as UNS K94100 and ASTM F30. Reputed for delivering tight tolerances and timely delivery, their Invar 42 bars and rods are best suited for industries requiring negligible thermal expansion and maximum performance, like electronics, aerospace, photonics, and precision engineering, where reliability under temperature fluctuation and mechanical stress is imperative.
**Invar 42 Bars and Rods** are nickel-iron controlled-expansion alloys with approximately 35–42% nickel, the rest iron, and trace elements of manganese (≤0.6%), silicon (≤0.3%), carbon (≤0.05%), and traces of copper, molybdenum, chromium, phosphorus, and sulfur ([alloysintl.com][1]). Mechanically, when in the annealed state, they have tensile strengths of about 490 MPa, yield strength about 250 MPa, elongation of approx. 40–42%, and modulus of elasticity \\~148 GPa ([shop.machinemfg.com][2]). Their distinguishing feature is a very low and constant coefficient of thermal expansion (~1.1–1.2 × 10⁻⁶/°C in the temperature range 20–300 °C) and a melting point close to 1427 °C ([zytcalloy.com][3]).
| Standards : | ASTM F30, ASME SF30 |
| Dimensions : | EN, DIN, JIS, ASTM, BS, ASME, AISI |
| Wire : | Thickness starting from 0.05mm |
| Round bar size : | Diameter: 3-~800mm |
| Hex Bar size : | 2-100mm A/F |
| Flat bar size : | Thickness: 2 -100mm / Width: 10 to 500mm |
| Square bar size : | 4 to 100mm |
| Rectangular Bars Size : | 33 x 30mm to 295 x 1066mm |
| Hollow Bar : | 32mm OD x 16mm ID to 250mm OD x 200mm ID |
| Tolerance : | H8, H9, H10, H11, H12, H13K9, K10, K11, K12 or as per clients’ requirements |
| Finish : | Black, Bright Polished, Rough Turned, NO.4 Finish, Matt Finish, BA Finish |
| Grade | C | Mn | Si | S | Fe | Ni | Cr | P | Mo | Cu | Mo |
| Invar 42 | 0.1 max | 0.6 max | 0.35 max | 0.025 max | Balance | 35.0 – 37.0 | 0.5 max | 0.025 max | 0.5 max | 0.5 max | 0.5 max |
| Yield Strength (0.2%Offset) | Tensile Strength | Elongation | Hardness |
| Ksi – 36 , MPa – 248 | Ksi – 71 , MPa – 490 | 40 % | 40 |
| STANDARD | WERKSTOFF NR. | UNS |
| Invar 42 | 1.3917 | K94100 |
**Invar 42 Bars and Rods** are best suited for **glass-to-metal and ceramic-to-metal seals** for electronics, semiconductor packages, thermocouple rods, and vacuum tubes due to their closely matched thermal expansion characteristics. In the **metrology and precision instrument industries**, they are employed in optical mounts, geodetic leveling rods, and calibration equipment where dimensional precision is paramount ([zytcalloy.com][3]). They’re also employed in **aerospace composite tooling**, automotive-industrial lamp leads, and capacitor bushings, offering stability under thermal stress ([alloysintl.com][1]). Their low thermal expansion and high ductility make them critical in any device requiring structural integrity over fluctuating temperatures.
We provide products that come with both mill test certificates and third-party test certificates, ensuring the highest standards of quality and compliance.
Neil Metals is a leading manufacturer, supplier, and exporter of high-quality bars, rods, and forgings, catering to various industries in Kolkata, India
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