Nickel Invar Small Diameter Tubing

Nickel Invar Small Diameter Tubing

Ultra-Low Expansion Precision Tubing from International Tube

At International Tube, we manufacture precision Invar® small diameter tubing (UNS K93600), a nickel-iron alloy renowned for its extraordinarily low coefficient of thermal expansion (CTE). Containing approximately 36% nickel and 64% iron, Invar maintains dimensional stability across wide temperature ranges, making it the material of choice for high-precision applications where thermal movement must be minimized.

Invar’s near-zero expansion properties—especially in the range of room temperature to ~200°C—make it an essential material for precision instruments, aerospace components, and glass-to-metal seals where stability and exact alignment are critical. It also offers excellent mechanical strength and is readily machinable using conventional and advanced manufacturing techniques.

Invar Tubing Features & Applications

Nickel Invar tubing from International Tube is ideal for applications requiring dimensional precision under thermal stress, and is commonly used in:

• Precision measurement and metrology instruments

• Aerospace and satellite structural supports

• Electronic component housings

• Optical systems and sensor alignment frames

• Glass-to-metal sealing for vacuum and electronic devices

• Cryogenic systems where material stability is critical

• Telecommunication components and hybrid circuit packaging

At International Tube, our Invar small-diameter tubing is produced using high-purity strip stock, plug drawn in coil form, and annealed as necessary to achieve desired mechanical and temper characteristics. Tubing is available in both straight lengths and continuous coil form, supporting both manual assembly and automated fabrication environments.

When your application demands exceptional thermal stability and tight dimensional control, trust International Tube to deliver Invar tubing engineered for unmatched precision and reliability.