How Much Rare Earths Does an F-35 Really Contain?

Why It Matters

Accurate rare‑earth accounting reshapes risk assessments for defense contractors, investors, and policymakers who focus on material scarcity and supply‑chain concentration rather than inflated mass figures.

Key Takeaways

• 920‑lb figure originates from unreleased 2012 DoD recycling study.
• GAO 2024 report says DoD REE demand <0.1% global.
• Actual F‑35 rare‑earth mass estimated at 40‑70 kg total.
• Pure elemental REEs in an F‑35 amount to 11‑20 kg.
• Supply risk centers on high‑performance SmCo and HREE‑doped NdFeB grades.

Pulse Analysis

The 920‑pound rare‑earth estimate for the F‑35 has become a textbook example of how a single, opaque source can dominate policy dialogue for years. Originating from a 2012 internal DoD recycling feasibility study, the figure was never accompanied by a bill‑of‑materials or verifiable calculations. Subsequent Inspector General criticism exposed systemic weaknesses in the Department’s data‑validation processes, yet the number persisted in congressional testimonies and official websites, creating a myth that obscured the true material footprint of the fighter jet.

A physics‑based audit, drawing on publicly disclosed component counts from Lockheed Martin, Honeywell, and Moog, paints a far more modest picture. Permanent‑magnet systems account for roughly 23 kg of samarium‑cobalt alloy, while NdFeB motors contribute an additional 8‑20 kg of alloy, translating to about 3‑6 kg of pure rare‑earths. Thin‑film yttria‑stabilized zirconia coatings and ancillary optics add only grams to kilograms. Summed together, the F‑35 contains 40‑70 kg of REE‑bearing material, or 11‑20 kg of elemental rare earths—just a fraction of the widely quoted 417 kg.

For investors and defense planners, the strategic takeaway shifts from bulk volume to the concentration of critical high‑performance grades such as SmCo and heavy‑rare‑earth‑doped NdFeB. These specialized alloys are produced in a limited number of overseas facilities, making supply disruptions a more pressing concern than the overall mass of rare earths used. Accurate data therefore informs more nuanced risk models, procurement strategies, and policy decisions aimed at securing the supply chain for the most sensitive materials rather than chasing inflated headline numbers.