Precision nickel iron alloy 42, also known as 4J42 or Invar 42, is a premium quality material that we, as a factory, specialize in producing hot forged round rods and flat bars. Our products are carefully manufactured using state-of-the-art technology and machinery, ensuring excellent precision and superior durability. This alloy is widely used in various industries due to its unique properties, such as low thermal expansion and high dimensional stability. With our expertise and commitment to delivering top-notch products, we guarantee utmost satisfaction to our customers.