A loose hinge degrades the entire user experience
At the intersection of ambition and precision, Apple's first foldable iPhone finds itself held hostage by one of its smallest parts. The liquid metal hinge — a manufacturing first for the industry — has introduced rattling and instability that no amount of display sophistication can compensate for. With Samsung's advanced OLED panels already in production and a September launch on the calendar, the question is whether a component smaller than a fingernail will determine the fate of one of Apple's most anticipated products in years.
- A pioneering liquid metal 3D-printed hinge, meant to signal Apple's engineering ambition, is instead producing rattling sounds and failing to meet the stability standards the iPhone Fold demands.
- The defect is not cosmetic — a loose hinge degrades every open-and-close interaction and worsens the screen crease that foldable phones have struggled to eliminate since the category began.
- Apple appears to be choosing individual unit inspection over rushing flawed devices to market, a quality-first stance that is compressing an already tight production window.
- A delay of just 15 days to one month could push the iPhone Fold's availability into 2027, turning a flagship launch into a visible stumble for a company that has already postponed the device once.
- iPhone 18 Pro sales offer a financial buffer, but no revenue cushion can fully absorb the reputational and competitive cost of missing the foldable moment Apple has spent years building toward.
Samsung has begun exclusive production of three million M16 OLED panels for the iPhone Fold, deploying some of the most advanced display technology available. It is a significant industrial milestone — but one that may mean little if the device's hinge cannot be tamed.
Apple selected a liquid metal 3D-printed hinge for the Fold, a first for any commercial foldable smartphone and a choice that could influence the entire industry. In practice, however, the component has proven difficult to control. Reports from Korean media describe rattling sounds and stability problems that have resurfaced after initially being disputed. For a mechanism users will touch with every interaction, and one that directly affects both feel and screen crease visibility, the margin for imperfection is essentially zero.
September remains Apple's target, but the hinge is creating a bottleneck. Rather than ship units with unresolved quality concerns, Apple appears to be moving toward inspecting each device individually — a labor-intensive process that raises costs and reduces launch volume. If the defect rate is meaningful, the ripple effects on annual shipment targets could be significant.
The arithmetic is harsh: a slip of even 15 days, compounded by hand-inspection requirements, could push the iPhone Fold into 2027. That would mark a second delay for a product Apple has positioned as a category-defining innovation, giving competitors more runway and testing investor confidence. The iPhone 18 Pro line offers some revenue insulation, but it cannot substitute for the momentum Apple has built around its foldable ambitions. Whether Samsung's panels ever reach customers this year may ultimately depend on whether engineers can bring one small, stubborn component into alignment.
Samsung has begun manufacturing the display panels for Apple's long-awaited foldable phone, the iPhone Fold, with an exclusive contract to produce three million units of the advanced M16 OLED screens this year. The partnership represents a significant technical achievement—the displays will incorporate Color Filter on Encapsulation technology paired with the M16 generation, among the most sophisticated screen innovations available. Yet even as Samsung readies its production lines, a single component threatens to derail the entire launch timeline: the hinge.
Apple has chosen to use a liquid metal 3D-printed hinge in the iPhone Fold, a manufacturing approach that would mark the first time such a technique has been deployed in a commercial foldable smartphone. The innovation could reshape how competitors approach their own folding devices. But reports from Korean media outlets suggest the hinge is proving troublesome in practice. The component has been linked to rattling sounds during assembly—a claim that was initially disputed but has resurfaced in recent weeks. More fundamentally, Apple appears to be struggling to achieve the stability and precision the hinge requires.
The stakes are high because a hinge problem is not merely a technical inconvenience. When a user opens and closes the iPhone Fold, they will feel the quality of that mechanism directly. A loose or unstable hinge degrades the entire user experience. It also affects the visibility of the crease that naturally forms when the screen folds—a cosmetic issue that has plagued foldable phones since their inception. For Apple, which has built its reputation on hardware refinement, either problem is unacceptable.
September remains the target launch month, according to sources familiar with Apple's plans. But the hinge issues are creating a production bottleneck that could delay availability by anywhere from two weeks to a full month. That timeline compression forces a difficult choice: either rush units to market with quality concerns, or slow production to inspect each device individually. Apple appears to be leaning toward the latter. Individual inspection is time-consuming and expensive, adding labor costs to each unit and reducing the number of phones available at launch. If the defect rate proves significant, the impact on Apple's total shipment targets for the year could be substantial.
The math is unforgiving. If production slips by even 15 days, and if quality control requires hand-checking every unit, the iPhone Fold may not reach customers until well into 2027. That would represent a significant miss for a product Apple has been positioning as a flagship innovation. The company has already delayed the foldable phone once; another postponement would test investor patience and give competitors more time to refine their own folding devices.
There is a cushion, though not a comfortable one. The iPhone 18 Pro and iPhone 18 Pro Max are expected to launch on their normal schedule, and demand for those models could offset any revenue shortfall from a delayed iPhone Fold. Apple's core business remains robust enough to absorb the hit. But for a company that has staked considerable engineering effort and marketing momentum on the foldable category, a slip into next year would be a visible stumble. The next few months will determine whether Samsung's advanced displays ever make it into customers' hands this year, or whether the hinge—a component smaller than a fingernail—becomes the reason an entire product line misses its moment.
Notable Quotes
A low-quality hinge will not just affect the device's crease visibility, but it'll also impact the feel of opening and closing the iPhone Fold, which has so far proven to be a major obstacle for Apple.— The Elec (Korean media reporting on Apple's production challenges)
The Hearth Conversation Another angle on the story
So Samsung is already making the screens for this phone, but the hinge is the problem. That seems backwards—wouldn't you expect the display to be the hard part?
You'd think so. But a foldable hinge is actually a mechanical engineering problem, not just an electronics one. It has to flex thousands of times without wearing out, and it has to feel solid when you use it. A rattling hinge tells you the tolerances are off—the parts aren't fitting together tightly enough.
And the 3D printing is new. Has Apple done this before?
Not in a shipping product at this scale. Liquid metal 3D printing is precise, but it's also finicky. Every unit might come out slightly different. That's why they'd need to inspect each one individually.
Which slows everything down.
Exactly. And adds cost. You're paying someone to check every single phone instead of running them through an automated line. If the defect rate is high, you're also throwing away money on units that don't pass inspection.
Could they just delay the announcement until the hinge is fixed?
They could, but September is when Apple always announces new iPhones. Missing that window means missing the entire fall sales season. It's not just about the Fold—it's about the whole product ecosystem launching together.
So they're stuck.
They're stuck. Either they announce in September and ship late, or they delay the announcement and lose the marketing moment. Neither option is good.