Alloy 42 / Nilo 42 (UNS K94100 )/W. Nr. 1.3917
Alloy 42 (Nilo 42 / UNS K94100 / W.Nr. 1.3917) is a binary iron-nickel controlled-expansion alloy containing ~42 % nickel — no cobalt. Its coefficient of thermal expansion is engineered to match soft (lead) glasses, making it a standard material for glass-to-metal seals where its expansion curve fits the glass grade.
Alloy 42 is best known as the dominant material for semiconductor lead frames — stamped or photochemically etched by the billions for IC packaging — and as the low-expansion component of thermostat bimetal strips. As a cobalt-free alternative to Kovar, it offers a significant cost advantage wherever its CTE match is sufficient. Available in strip, sheet, foil, bar, wire, and precision stamped/etched components (lead frames, lids, frames, contact springs).
- CTE Matched to Soft (Lead) Glasses
- The Semiconductor Lead Frame Industry Standard
- Cobalt-Free — Significant Cost Advantage vs. Kovar
- The Standard Low-Expansion Side of Thermostat Bimetal
- Exceptional Deep-Drawing, Stamping & Etching Capability
Product Specifications
42
strength
hardness
coefficient
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Our product is available in various forms such as Sheet / Plate, Bar, Wire, Tube / Pipe, and Strip. With a wide thickness range (0.5 – 60mm for sheets), customizable tolerance, and different surface finishes, we can tailor to your unique needs. Plus, our flexible MOQ and reliable packaging ensure a smooth purchasing experience. Don’t miss out on finding the ideal product for your project!
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