A new market forecast from research firm IndexBox projects the global automotive mechanical components market out to 2035, naming electrification and aftermarket demand as the twin growth drivers. The 12-year horizon is longer than the typical supplier strategy cycle, and the choice says something about how IndexBox is framing the transition.

The report, distributed through IndexBox's platform, treats mechanical components as the segment of the parts supply chain most exposed to powertrain change. Battery-electric vehicles don't need engine blocks, multi-speed gearboxes or exhaust hardware. Combustion-engine service parts, meanwhile, can keep generating revenue long after a vehicle leaves the assembly line.

What does the forecast actually cover?

Here's the catch: IndexBox's public summary discloses no CAGR, no dollar figure and no regional split. The teaser names the drivers and the year. The numbers sit behind a paid download.

For manufacturing readers, that's a familiar pattern. The headline tells you the direction; the curve sits in the spreadsheet you don't get to see. Treat the teaser as a steer, not a data point.

That said, the two engines IndexBox names are well-rehearsed arguments inside the supplier tier-one community:

• Electrification is shrinking the addressable market for legacy mechanical parts. Each EV sold displaces a clutch, a gearbox, a driveshaft, an exhaust system.
• Aftermarket demand is keeping legacy mechanical parts alive longer than OEM planners expected. A car built today will still need replacement components well into the 2040s.

Why the 2035 horizon matters

Most supplier strategy decks run five years out. IndexBox's 12-year window is an attempt to capture the full arc of the EV transition, from early-adopter markets through laggard regions, plus the long aftermarket tail of the combustion fleet that keeps selling.

For tier-one suppliers, that long view lines up with how plants and tooling actually depreciate. A stamping press amortises over a decade. A skilled workforce takes longer to retrain than the EV ramp takes to bite. Strategy that runs only to 2030 tends to undercount the bill.

What to watch next

Manufacturing editors tracking mechanical-components suppliers should keep an eye on three milestones:

• IndexBox's next quarterly data release, which historically refines regional splits and component-level granularity beyond the headline drivers.
• EV penetration curves by region. Each percentage-point shift up is a percentage-point shift down in mechanical-parts OEM demand.
• Tier-one plant announcements. Watch which mechanical-component plants add EV-adjacent lines — battery enclosures, e-axle housings, thermal modules — and which quietly close.

The forecast is a steer, not a verdict. The verdict lands when the next plant closure notice hits the wire.