Howmet Aerospace Inc. (HWM)

Aircraft engines are extraordinary machines. They operate at temperatures that approach the melting point of steel, compress air to pressures that would crush most materials, and spin at tens of thousands of revolutions per minute while remaining perfectly balanced and reliable. The components inside a jet engine are pushed to the absolute limits of materials science. A single defect or failure can be catastrophic. Building these parts requires decades of expertise, proprietary manufacturing processes, and uncompromising quality control.

Howmet Aerospace makes many of the components that go into these engines. It makes turbine blades, casings, fasteners, and other critical parts. It also makes structural components for aircraft fuselages and landing gear. These are not consumer products or commodities. They are specialized, engineering-intensive parts that only a handful of companies in the world can manufacture to the standards required by the aerospace industry.

The business is consolidated and durable. Howmet supplies Rolls-Royce, General Electric, Pratt and Whitney, and the commercial aircraft manufacturers (Boeing and Airbus). These are longstanding, sticky relationships. Once a supplier is qualified for a particular engine model or aircraft, switching to a competitor is so expensive and disruptive that it almost never happens. This gives Howmet and its competitors a remarkable degree of pricing power and customer loyalty.

Engine components and the challenge of extreme conditions

The hottest, most demanding part of a jet engine is the turbine section. Hot gases from the combustor flow through a series of rotating turbine blades that extract energy and drive the compressor upstream. These blades operate at temperatures in excess of fifteen hundred degrees Celsius — hot enough that the nickel-based superalloys used to make them are approaching their limit.

Howmet makes turbine blades and other engine components from these exotic materials. The company has developed proprietary casting, forging, and heat-treatment processes that allow these materials to perform at the extreme temperatures and stresses required by modern engines. The turbine blades are single-crystal components, which means each blade is grown as a single crystal rather than assembled from multiple crystals. This gives the material superior properties at high temperatures.

The turbine casings that contain these blades are similarly demanding. They must be light to minimize engine weight, strong enough to contain the high pressures inside the engine, and thermally stable so they do not distort under temperature gradients. Howmet manufactures these casings in titanium and nickel-based alloys, using proprietary techniques.

Beyond the hot section, Howmet makes compressor blades, casings, and other components that operate at lower temperatures but are nonetheless critical to engine performance. The company also makes engine seals, combustors, and afterburner components.

The key to success in this business is not just materials knowledge, but manufacturing capability. A competing company might know that a particular alloy performs well at high temperature, but actually making a turbine blade from that material — casting it, machining it, heat-treating it, inspecting it to ensure it meets specifications — requires proprietary expertise. Howmet has spent decades accumulating this knowledge and is deeply entrenched with its customers.

Fasteners and structural components

Howmet also manufactures fasteners — bolts, rivets, and fastening systems — for commercial and military aircraft. These components must be lightweight, strong, and corrosion-resistant. Many are made from titanium or specialized aluminum alloys. Howmet makes fasteners for airframes, wings, and fuselages, and also manufactures fastening systems for engines and other critical structures.

Fasteners are a fragmented market where many suppliers compete, but Howmet’s position is strong because the company has qualified products for most of the major aircraft and engine programs. Once an aircraft manufacturer or engine maker has certified a Howmet fastener for a particular application, switching suppliers is difficult and expensive.

Howmet also manufactures structural forgings and castings for landing gear, engine mounts, and other critical structures. These are specialized, high-strength components that demand precision and reliability. Landing-gear components in particular are high-stressed and failure-intolerant — they must perform perfectly when an aircraft lands, often with significant load.

The economics and competitive dynamics

Aerospace suppliers operate in a unique economic model. Companies like Boeing and Airbus commit to buying aircraft parts from particular suppliers for the lifetime of a program. A successful engine design might be produced for twenty or thirty years. The customer and supplier sign long-term agreements that commit the supplier to meet delivery schedules and volume requirements in exchange for a committed revenue stream. This is different from consumer product markets, where competitors vie for share with every purchase.

The long-term contract model creates a stable, predictable business for suppliers like Howmet. Once a supplier wins a program, the revenue is essentially locked in. The challenge for Howmet is to win programs and then execute efficiently so that the margins remain attractive as the program matures.

Pricing in aerospace supply contracts typically follows a “learning curve.” Early in a program, when volumes are low and the manufacturer is still optimizing the manufacturing process, costs are high. As production ramps and the company learns how to make the part more efficiently, costs fall. The contract typically specifies that prices will decline along a predetermined learning curve. Suppliers like Howmet must continuously improve efficiency to maintain margins as prices decline.

Howmet competes against a few other large suppliers like Precision Castparts (now owned by Berkshire Hathaway) and GE Aviation’s subsidiary businesses, as well as specialized competitors in particular product categories. The market is consolidated — only a handful of suppliers have the technical capability, scale, and financial resources to serve the largest programs. This consolidation creates high barriers to entry and supports profitability for the surviving competitors.

Revenue streams and segments

Howmet’s revenue comes from multiple segments. Engine Products manufactures turbine blades, casings, and other hot-section components. This is the highest-margin business because the technology is proprietary and customers have few alternatives. Fastening Systems manufactures and sells fasteners and fastening solutions. Engineered Structures produces landing-gear components, engine mounts, and other structural forgings and castings. Industrial Aftermarket supplies parts for repair and overhaul of existing engines and aircraft.

The Aftermarket segment is particularly valuable because it represents recurring revenue. As fleets of aircraft age, they require spare parts for maintenance and repair. Howmet supplies these parts at prices that typically carry higher margins than original-equipment production, because the customer has no alternative source and cannot afford downtime while waiting for a particular part.

Risks and dependencies

Howmet’s single largest risk is its dependence on commercial aviation. The company derives a large portion of revenue from components for commercial aircraft engines. When commercial aviation is strong, Howmet does well. When a recession or external shock (like the pandemic-driven airline collapse in 2020) reduces flying, demand for new aircraft falls, and Howmet’s revenue declines sharply.

The military and defense business provides some diversification and stability, but Howmet’s exposure to commercial aviation is material.

A second risk is technology and product transition. If aircraft manufacturers shift to new engine designs or switch to suppliers with newer technology, Howmet might lose business on particular programs. The company must continue to invest in research and development to maintain its technical leadership and win new programs.

Labor costs and supply-chain reliability are operational risks. Howmet relies on specialized labor to manufacture complex aerospace components, and tight labor markets can push up wages. Similarly, specialized materials and supplies are critical, and supply disruptions can constrain production.

Finally, there is regulatory risk. Changes to aviation safety standards or environmental requirements could necessitate expensive investments in new manufacturing capability or modifications to existing processes.

How to research Howmet

Investors studying Howmet should begin with the annual 10-K filing (SEC CIK 0000004281) to understand the revenue breakdown by segment and customer, the backlog of future work, and the company’s strategic plans. The quarterly earnings calls are where management discusses program wins, delivery rates, and margins.

Key metrics include the backlog, which represents future committed revenue. A healthy backlog signals that demand is strong and that revenue is secure for years to come. Watch the gross-margin trends — improving margins indicate that the company is executing efficiently and that pricing power is stable.

Monitor the commercial aviation cycle through commentary on airline fleet growth, aircraft orders, and production rates. Track defense and military spending separately, as these markets move independently from commercial aviation.

Understand the capital requirements and return on invested capital. Aerospace manufacturing is capital intensive, and investments in new tooling, facilities, and machinery are required to support program production. Management should be delivering acceptable returns on these investments.

Finally, pay attention to customer concentration. If one customer (one aircraft manufacturer or engine maker) represents more than a quarter of revenue, concentration risk is material, and any loss of business with that customer would significantly impact results.