Serving London's most demanding applications — from Thames Tideway infrastructure to defence electronics at DSEI — our top connector series deliver zero-leak hermetic integrity under extreme conditions.
Y50DX Series — London Defence & Military Grade Circular Connectors
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FQC Series — Bayonet Waterproof Connectors for London Industrial Use
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Y50X Series — Military Standard Connectors for London Procurement
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YLH Series — Internal-Bayonet Circular Connectors for London Energy Sector
View Details →London is one of Europe's most active hubs for advanced manufacturing, defence procurement, smart energy infrastructure, and rail engineering. The demand for hermetic seal connectors — components that guarantee airtight, moisture-proof, and pressure-resistant electrical connections — has grown substantially across the city's key sectors.
London's £4.2 billion Thames Tideway Tunnel project and the wider water utility network require hermetically sealed connectors that withstand high-moisture, high-pressure underground environments. Our IP68-rated connector series are engineered precisely for such critical infrastructure deployments.
The Elizabeth line expansion and ongoing Tube modernisation programmes demand rail-grade connectors with hermetic sealing to handle vibration, temperature fluctuation, and electromagnetic interference. Our JL5 locomotive-series connectors meet EN 45545 and IEC standards for London's rail environment.
With London targeting net-zero by 2030, National Grid and UK Power Networks are deploying smart metering and offshore wind integration projects across the Greater London area. Hermetic connectors are critical at every junction point where electrical sealing prevents moisture ingress and arc faults.
London hosts DSEI — one of the world's largest defence & security exhibitions — reflecting the city's central role in UK defence procurement. Our military-grade Y50DX and Y50X series connectors satisfy MIL-DTL-38999 equivalent standards, serving London-based defence prime contractors and MOD supply chains.
London's role as the financial and logistics hub for North Sea oil & gas operations means many procurement decisions for subsea hermetic connectors are made here. Our petroleum-grade connectors meet ATEX and IECEx requirements for explosive atmosphere environments.
London's world-class research institutions — Imperial College London, UCL, and the Francis Crick Institute — utilise hermetic connectors in vacuum chambers, MRI-compatible equipment, and cryogenic research apparatus. Our mini Y4M series provides compact hermetic solutions for precision lab environments.
Recognised as a national-level "Key Little Giant" enterprise — specialised, refined, unique, and innovative — Shandong Longli Electronics is one of China's foremost manufacturers of hermetic seal and circular connectors. The company holds provincial-level Gazelle Enterprise, Hidden Champion, and Manufacturing Single Champion designations in Shandong Province.
Operating R&D centres in Linyi, Xi'an, and Jinan, the company maintains comprehensive third-party service capabilities including testing and inspection services, with internationally recognised certifications: CMA, CNAS, ISO9001:2015, and IATF16949:2016.
For London-based buyers and procurement teams, Longli offers DDP shipping, English-language technical documentation, and dedicated export support to ensure seamless integration into UK supply chains.
The global hermetic connector market is projected to exceed USD 3.8 billion by 2030, driven by electrification, miniaturisation, and the push for greener infrastructure. London, as a global financial and technology capital, sits at the centre of these converging trends.
London's commitment to banning new petrol vehicles by 2035 is accelerating EV charging rollout across the city. High-voltage hermetic connectors rated for IP67/IP68 are essential at every charging station junction, protecting against London's notoriously wet climate and underground installations.
London's Smart City programme deploys thousands of environmental sensors, traffic monitors, and flood detection nodes. Compact hermetic connectors — such as our Y4M mini-circular series — enable reliable, sealed connections in space-constrained urban sensor enclosures.
UK defence spending increases and the AUKUS partnership are driving demand for military-grade hermetic connectors in submarine, aerospace, and missile systems. London-based prime contractors are sourcing compliant connectors that meet MIL-SPEC equivalents at competitive price points.
The UK leads Europe in offshore wind capacity. Subsea cable junction boxes and offshore platform instrumentation require hermetically sealed connectors that withstand saltwater immersion, pressure, and continuous vibration — conditions our FX16-7 waterproof series is purpose-built to handle.
HS2's London terminus at Euston and the associated signalling and power infrastructure create significant demand for railway-grade circular connectors. Our JL5 locomotive series and Y50EX connectors are engineered to EN 50155 railway standards for vibration and temperature resilience.
London is home to over 70 major data centres in the Docklands corridor. Power distribution units within these facilities require hermetically sealed connectors to prevent moisture-related failures in high-density server environments — a growing niche for our smart grid connector range.
Over 20 R&D achievements have passed provincial appraisals, with two reaching international advanced levels and twelve achieving domestic leading levels — giving London's procurement teams confidence in every specification.
Awarded Science and Technology Progress, Patent Star Enterprise, and Famous Trademark. Numerous products listed in the National Torch Programme. Recognised credentials that London procurement and compliance teams can verify.
Over 10 senior engineers and 100 R&D professionals across regional centres in Linyi, Xi'an, and Jinan. 12 dedicated technical departments ensure rapid customisation for London-specific application requirements.
Certified to ISO9001:2015 & IATF16949:2016, with CQC and MA certifications. Advanced testing laboratories and complete quality processes ensure every connector shipped to London meets specification — first time, every time.
Products exported to more than 20 countries including the UK, Germany, and the USA. Long-term stable partnerships with military, grid, and new energy clients demonstrate the reliability London's critical infrastructure projects demand.
The company has undertaken more than 60 research projects, including the Torch Programme of the Ministry of Science and Technology, provincial major science and technology projects, and provincial key R&D programmes. It has received 25 scientific and technological awards, including provincial science and technology awards and provincial SME technological progress awards.
Over 20 achievements have passed provincial appraisals, with two reaching international advanced levels and twelve achieving domestic leading levels — a track record that underpins every hermetic connector we supply to London and the wider UK market.
The company primarily offers seven major categories of products — military connectors, smart grid connectors, new energy vehicle connectors, railway locomotive connectors, mining connectors, petroleum connectors, and marine connectors — encompassing over 130 series and thousands of specifications. These products are widely used in aviation, aerospace, military electronic equipment, as well as power grids, new energy, railways, telecommunications, petroleum, and coal mining sectors globally, including London and the wider UK.
Y50DX Series — London Defence Circular Connectors
View Details →FQC Series — London Waterproof Bayonet Connectors
View Details →Y50X Series — London Military Standard Connectors
View Details →YLH Series — London Energy Sector Bayonet Connectors
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JL5 Series — London Underground & HS2 Locomotive Connectors
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Y50EX Series — London Rail & Transport Circular Connectors
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Y4M Series — London Smart City & IoT Mini Circular Connectors
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FX16-7 Series — London Offshore Wind & Subsea Waterproof Connectors
View Details →Get certified, high-reliability connectors from China's leading manufacturer — with full export documentation, English technical support, and competitive pricing for London and UK buyers.
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