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Invar Fasteners

Invar Fasteners are typically used in high performance applications that require a low coefficient of thermal expansion (CTE) and high dimensional stability. Invar is a Nickel-Iron based alloy that offers a range of properties depending on the grade and chemical composition. These fasteners are typically supplied in:

Invar 36:
Often referred to as Alloy 36, this alloy consists of 64% Iron and 36% Nickel. It provides a rate of thermal expansion approximately one-tenth that of Carbon Steel at temperatures up to 200°C, with an almost zero rate of thermal expansion at cryogenic temperatures as low as -150°C. Invar 36 also features high strength and toughness at cryogenic temperatures – ideal for a range of low temperature or low expansion applications e.g. structural components and precision instruments.

Super Invar:
Invar 32-5 or Alloy 32-5 is a magnetic alloy composed of 32% Nickel, 5% Cobalt and the balance Iron. Designed to provide minimum thermal expansion at ambient temperatures, Super Invar hosts thermal expansion properties less than that of Invar 36 when used between -55°C and 95°C. With a CTE approximately one-third that of regular Invar, these fasteners are regularly utilised for precision measuring devices where changes in dimensions due to thermal expansion should be minimal.

Available now at Fastenright

Detailed product information, size charts, drawings and technical specifications can be found by clicking the links below. We supply a range of Invar Fasteners here at Fastenright, including a variety of screws, bolts, nuts and washers – available either from stock or to order.

Non-standard sizes, grades and finishes are available to order as specials, while many of our existing products can be manufactured from Invar on request. Bespoke components manufactured to specification and drawings can also be supplied. Minimum order quantities apply.

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