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A prolonged disruption to shipping through the Strait of Hormuz is sending shockwaves beyond energy markets, creating turbulence in the global supply of metals used in everyday hardware products — from door locks to hinges. With commercial shipping through the strategic waterway operating at sharply reduced levels since late February, the hardware manufacturing sector is facing higher raw material costs, longer transit times and renewed pressure to diversify supply chains.

Strait under heavy disruption: shipping volumes fall, trade flows rerouted

The Strait of Hormuz, the narrow channel between Iran and Oman that normally handles around 20% of the world’s seaborne oil and petroleum liquids shipments — roughly 20 million barrels per day, according to the US Energy Information Administration — has faced severe disruption since 28 February 2026. On that date, US and Israeli forces launched military strikes against Iranian targets. Iran’s Islamic Revolutionary Guard Corps subsequently warned that vessels attempting passage without authorisation could face military action, prompting many commercial operators to suspend or reroute traffic.

Several cargo vessels reportedly reversed course or delayed transit during the initial escalation. Shipping and insurance firms quickly classified the route as high risk, leading to a sharp rise in war-risk premiums and a significant decline in normal commercial traffic.

Despite intermittent ceasefire efforts and diplomatic contacts, normal navigation has not resumed. In April, Iranian military authorities accused the United States of violating understandings linked to maritime security arrangements, while multiple shipping intelligence firms reported continuing security incidents near the strait. Reuters reported that merchant shipping activity remained limited and highly cautious, with some vessels subjected to warnings or interception attempts by Iranian patrol craft.

Data from maritime analytics firm Windward, released in April, showed that even after temporary de-escalation efforts, transit through the standard shipping lanes remained far below normal levels. Large shipping operators and many oil majors have yet to fully restore regular schedules. Windward estimated that roughly 3,200 vessels were delayed west of the strait at one stage of the disruption, while many ships operating inside the Gulf reduced visibility by switching off or limiting Automatic Identification System transmissions — a practice associated with elevated security risk.

Many commercial shipping lines have opted for the alternative route around Africa’s Cape of Good Hope. Windward estimates that this diversion extends the typical voyage between Europe and the Gulf from around 25 days to approximately 41 days, increasing transport costs by about 25%. The Baltic and International Maritime Council has advised shipowners to exercise extreme caution in the area because of ongoing security and mine-related risks.

The disruption is no longer confined to energy markets. Maritime trade data cited by several industry analysts showed a steep fall in dry bulk shipments through the strait during March. Shipments of industrial raw materials such as sulphur, gypsum and steel products all declined sharply as traders delayed exports, rerouted cargoes or struggled to secure insurance coverage. The disruption has increasingly become a broader manufacturing supply chain issue rather than solely an oil market crisis.

Key metal markets under pressure: copper climbs as sulphur shortage ripples downstream

The manufacture of door locks and hinges depends heavily on stainless steel, copper and zinc alloys. All three are now being affected by the Hormuz disruption through different supply-chain channels.

Copper: Middle East sulphur squeeze drives smelting costs higher

China, the world’s largest importer of copper concentrate, remains highly dependent on imported ore. While the Hormuz disruption has not directly halted global copper ore shipments, it has constrained trade in sulphur and sulphuric acid — key materials used in copper extraction and processing.

A substantial share of global sulphur exports originates from Gulf producers including Saudi Arabia, Qatar, Kuwait and the UAE. Sulphur is the primary feedstock for sulphuric acid production, which is essential for leaching copper from ore and for several nickel-processing technologies. Reuters reported in April that the disruption to Gulf sulphur exports had already pushed sulphur prices sharply higher and increased costs for copper and nickel producers worldwide.

Because sulphuric acid is difficult and hazardous to transport over long distances, replacing disrupted Middle Eastern supply has proved challenging. As the shipping disruption has persisted longer than many traders initially expected, alternative supply chains have struggled to scale up quickly.

The result has been renewed upward pressure on copper prices. London Metal Exchange copper prices rose above $13,000 per tonne during April 2026, remaining near historically elevated levels after setting record highs earlier in the year. COMEX copper futures also traded near record territory as investors reacted to tighter supply expectations, rising industrial demand and continuing geopolitical risk. Analysts note that declining ore grades, long mine-development timelines and growing demand linked to electrification and AI-related infrastructure continue to support structurally high copper prices.

Stainless steel: freight disruption inflates import costs

Stainless steel, widely used for lock faceplates, handles and hinges, depends on nickel and chromium inputs. China remains heavily reliant on imported supplies of both metals. Disruptions to shipping routes through Hormuz and the broader rise in dry bulk freight costs have increased transportation and insurance expenses across the steel supply chain.

Industry shipping data indicates that iron ore and steel-product movements through the Gulf region declined significantly during March and April. Even where Chinese manufacturers do not source directly from Gulf exporters, tighter vessel availability and rerouted cargoes have contributed to higher stainless steel production costs globally.

Zinc alloys: freight and insurance costs add pressure

Zinc alloy, widely used in mid-range locksets because of its relatively stable cost and ease of casting, has also come under pressure from higher freight and insurance expenses.

Although analysts still expect global zinc supply to remain broadly adequate, shipping disruption has increased the landed cost of imported zinc concentrate and refined zinc products for Chinese hardware manufacturers. Rising logistics costs are therefore feeding into downstream hardware pricing even without a severe global zinc shortage.

Price signals have already begun appearing at the wholesale level. Market indicators in major Chinese hardware manufacturing hubs, including Yongkang, show rising prices for construction and furniture metal fittings compared with pre-crisis levels.

Industry ripple effects: longer routes, higher logistics costs and diversification pressure

The Hormuz disruption is now cascading from upstream commodities into downstream manufacturing and consumer markets.

Shipping giant Maersk stated in April that maritime security conditions remained too uncertain for a full resumption of normal services through the area despite temporary ceasefire discussions. Freight analysts similarly noted that many commercial operators still treat the strait as a high-risk transit zone. Elevated freight and insurance costs are increasing the delivered price of metal raw materials while extending delivery times and complicating inventory management for manufacturers.

China, as the world’s largest producer and exporter of hardware products, faces mounting pressure from higher input costs for copper, stainless steel and zinc alloys. Many small and medium-sized lock and hinge manufacturers are attempting to offset rising costs through material-efficiency improvements, stronger component designs and expanded metal recycling systems.

A further concern within the shipping industry is the possibility that Iran could maintain a long-term security control regime over commercial transit through the strait. Several international media outlets, including the Financial Times, have reported that Iranian authorities introduced stricter vessel clearance and escort procedures during the crisis. Shipping analysts warn that if such controls become institutionalised, Gulf shipping costs could remain structurally higher even after military tensions ease.

In the longer term, the crisis is accelerating a broader reassessment of supply-chain resilience across the global hardware industry. Heavy dependence on a single maritime chokepoint has again exposed vulnerabilities in global trade networks. Diversification of raw material sourcing, expansion of recycled metal systems and larger strategic inventories are increasingly being viewed as necessary risk-management measures. As the UN Conference on Trade and Development has previously warned, disruption to critical shipping routes ultimately feeds through to freight, fuel and insurance costs — and eventually to consumers. The price fluctuations now appearing in everyday hardware products are a small-scale reflection of wider strain across the global trading system.