The UK cable assembly industry includes both smaller firms skilled in RF projects and larger manufacturers with years of automotive experience. Some focus on fast prototyping and quick delivery, while others provide advanced overmoulding or sealing for harsh conditions. The challenge isn’t finding custom cable assemblies companies UK, it’s finding the right one for your needs.
Cloom Tech combines exceptional speed-to-market capabilities with comprehensive quality certifications and competitive pricing through a global manufacturing network. Sound like what you need? Get a free quote from us today!
Best Custom Cable Assembly Company Overall
1. Cloom Tech
Cloom Tech is a specialised custom wire harness and cable assembly manufacturer serving UK companies through their global manufacturing network (facilities in China and Philippines).
The company works with top suppliers and Molex, Mouser, TE Connectivity and more. This mix of fast production and reliable parts makes Cloom Tech excellent value for money.
With 25+ years of combined team experience, they provide comprehensive custom cable assembly solutions for automotive, aerospace, medical, and industrial applications with impressive turnaround times.
Cloom Tech’s core strength lies in rapid prototyping, which can be completed within 2 to 3 weeks and mass production cycles of 4 to 5 weeks for large-scale orders. Their manufacturing capabilities include both high and low-voltage harnesses with customisable shielding and flexibility specifications for almost any application you can think of.
Their experienced technicians handle every step, from cutting, stripping and crimping to assembly and full electrical testing with detailed quality reports.
Cloom Tech maintains ISO 9001 and IATF 16949 certifications, giving them automotive industry compliance alongside UL certification and REACH/RoHS EU regulatory adherence. While they don’t offer actual design services, they do perform DFM (design for manufacturing) checks and offer guidance before going ahead with fabrication.
| Pros | Cons |
|---|---|
| ✅ Exceptional speed-to-market: prototyping in 3 weeks and full production in 4/5 weeks. | ❌ Don’t offer design services (but do offer DFM checks). |
| ✅ Full REACH and RoHS adherence plus automotive certifications for seamless UK market integration. | |
| ✅ Strategic supplier partnerships provides competitive pricing while maintaining quality standards. |
Key Specs
| Years of Experience: | 9 years (founded 2016), team experience: 25+ years combined. |
|---|---|
| Manufacturing Capabilities: | Production capacity: 10,000 pieces/hour with automated equipment, 40AWG to 120mm² gauge range, 500 to 8,000 terminals/hour crimping capacity, 10-step quality testing. |
| Certifications: | ISO 9001 (Quality Management), IATF 16949 (automotive), UL certification, REACH and RoHS EU compliance. |
Best for Established UK Manufacturing
2. Cornelius Electronics
Cornelius Electronics is a well-established UK contract manufacturer founded in 1979, operating from a 50,000 square foot facility in Port Talbot, South Wales. They started off serving the UK gaming machine industry, but now at 45 years of experience, they’ve become a trusted partner across medical, industrial, broadcast, automotive and even more sectors, producing over 11 million cable assemblies per year!
Cornelius specialises in custom cable assemblies from DFM check to full-scale production. Their machinery allows them to perform all the necessary processes to produce cable assemblies exactly to your specifications.
Manufacturing capabilities in their facilities include IPC-trained operatives certified to Class 1, 2 and 3 standards, with comprehensive testing protocols covering visual inspection, continuity testing, insulation resistance testing, hipot testing, signal integrity testing, environmental testing and pull/flex testing.
The company maintains vertical integration with extra services like vacuum forming (5,000 sq ft dedicated facility), overmolding, box build assembly and PCB integration, enabling complete turnkey solutions for complex electronic systems.
| Pros | Cons |
|---|---|
| ✅ Strong UK heritage & stability, 45+ years established with consistent growth. | ❌ May lack capacity for very large volume automotive OEM requirements. |
| ✅ In-house capabilities from design checks through vacuum forming, overmolding and box builds for complete solutions. | |
| ✅ True working partnership philosophy with collaborative engineering and long term relationship building. |
Key Specs
| Years of Experience: | 45+ years (founded 1979). |
|---|---|
| Factory Specifications: | 50,000 sq ft in Port Talbot, South Wales, 250+ trained operatives, £4+ million investment in manufacturing technology, 5,000 sq ft dedicated vacuum forming facility. |
| Certifications: | ISO 9001:2015 (Quality Management System), ISO 14001:2015 (Environmental Management System), UL Certified: ZPFW2 & ZPFW8, IPC/WHMA-A-620 trained operatives (Class 1, 2 & 3), Sedex member for ethical sourcing. |
Best for Global Manufacturing Scalability with UK Engineering Support
3. GTK UK
GTK UK is a well established electronics manufacturer operating as a subsidiary of Volex plc, a $400M AIM-listed business. Based in Basingstoke, Hampshire, the company has over 30 years of experience fabricating custom cable assemblies, connectors, displays and turnkey manufacturing solutions across diverse industries.
GTK operates a hybrid manufacturing model combining UK engineering expertise with cost effective global production capabilities across Romania and Far East partnerships.
They specialise in highly customised solutions, with over 98% of their cable assemblies featuring custom lengths, colours, special pin-outs, connectors, raw cables and overmolds. Manufacturing capabilities range from simple wire harness assembly through to complex pre-formed wire looms, custom overmolded cable assemblies, and high-end RF/coax cables.
GTK’s UK facility (19,200 sq ft) houses sales, engineering, and production departments, while their Romanian facility (4,843 sq ft, expandable to 21,500 sq ft) provides heavily automated, high volume production with identical manufacturing controls and ERP integration.
GTK maintains comprehensive quality certifications including ISO 9001:2015, ISO 14001:2015, AS9100D (aerospace/defense), UL approval and Cyber Essentials for data security. Their Core Material Strategy reduces costs and lead times through standardised component inventory, while their FastTrack prototype service can deliver samples within five days.
| Pros | Cons |
|---|---|
| ✅ Subsidiary of $400M Volex plc with 30+ year track record and continuous growth trajectory. | ❌ UK headquarters and engineering costs may impact pricing compared to pure offshore manufacturers. |
| ✅ Cost effective blend of UK engineering with Romanian automation. | |
| ✅ Extensive certification portfolio covering aerospace, medical, automotive and more markets. |
Key Specs
| Years of Experience: | 35 years (founded 1990). |
|---|---|
| Factory Specifications: | 19,200 sq ft facility in Hampshire, 4,843 sq ft (expandable to 21,500 sq ft) heavily automated production in Romania, long term affiliate factories with direct engineering oversight. |
| Certifications: | ISO 9001:2015 & ISO 14001:2015 (quality & environmental management), AS9100D (aerospace, defense & security markets), UL approved & UL wiring harness, traceability programme, cyber essentials (data security), various industry approvals: UL/CSA, IPC/WHMA-A-620. |
Best for High-Performance RF Applications
4. Scott Cables
Scott Cables is an independent UK manufacturer established in 1990 (originally as Select Enterprises), specialising in electrical and RF cable assemblies for applications in rough environments.
Based at a modern facility in Portsmouth, Hampshire, they’ve built a reputation serving the aerospace, rail, automotive, telecoms and broadcast sectors with high performance interconnecting solutions.
Their products are fully sealed ruggedised wiring harnesses for harsh environments, high performance microwave cables up to 70GHz and precision RF cable assemblies with phased matching capabilities.
They’re involved in some sizable projects. Scott supplied the cable assembly harnesses for 70 HMT Jackal vehicles for the UK Ministry of Defence through Supacat. They’ve also been the European Master Distributor for Times Microwave since 2001, so they’ve been serving the community for decades.
Scott Cables holds comprehensive certifications including ISO 9001/AS9100 Rev D for aerospace applications, ISO 14001 for environmental management and Cyber Essentials for data security. The company is JOSCAR registered for defence work and has achieved “ship-to-stock” status with several major OEMs, showing consistent quality performance.
All production operators are trained to IPC/WHMA-A-620 standards with 100% electrical testing of cable assemblies. Their independent business model enables rapid response to customer needs with no minimum order quantities and competitive pricing through direct manufacturer relationships.
| Pros | Cons |
|---|---|
| ✅ Specialised high performance capabilities with RF expertise up to 70GHz. | ❌ SME structure may constrain capacity for very high volume automotive OEM requirements. |
| ✅ AS9100 Rev D certified, JOSCAR registered with proven MoD project track record. | |
| ✅ No minimum orders, rapid quotations and flexible approach to customer requirements. |
Key Specs
| Years of Experience: | 35 years (established 1990, rebranded as Scott Cables 2012). |
|---|---|
| Factory Specifications: | Modern facility in Portsmouth, Hampshire with tool room, test facilities, thermal chamber for cable pre-conditioning. |
| Certifications: | ISO 9001/AS9100 Rev D (quality management/aerospace), ISO 14001 (environmental management), cyber essentials (data security), JOSCAR registered (defence supply chain), IPC/WHMA-A-620 trained operators. |
Best for Project-Driven Fibre Optic Solutions
5. RCL Global
RCL Global is a specialist UK distributor and manufacturer of fibre optic and data networking products, established in 2005 and based in Swindon. The company has solidified its reputation by working closely with leading suppliers and manufacturers to source, design, supply and deliver state-of-the-art components and complete solutions as quickly and cost-effectively as possible.
Unlike traditional cable assembly manufacturers, RCL Global operates as both a specialist distributor and bespoke manufacturer, giving you unique flexibility. But what really distinguishes RCL Global is their project-centric approach to complex connectivity challenges.
The company has delivered solutions for major airports such as Manchester, Gatwick and Edinburgh, supported telecoms companies with 4G rollouts, worked on large rail project, and even handled urgent deliveries for cruise ships!
RCL Global’s product range encompasses networking products, fibre products, power cables, cable management solutions, cabinets, coaxial products, PDUs, crimp tools and testers, connectors, computer cables and voice products, all manufactured to high standards with comprehensive quality testing.
| Pros | Cons |
|---|---|
| ✅ Unique hybrid model combining specialist distribution with bespoke manufacturing capabilities for maximum project flexibility. | ❌ Distribution-focused model may lack deep manufacturing specialisation. |
| ✅ Proven track record delivering complex, time-critical projects across airports, rail, telecoms and more. | ❌ Certifications not explicitly listed. |
| ✅ Efficient global supply chain with next-day delivery service. |
Key Specs
| Years of Experience: | 19 years (established 2005). |
|---|---|
| Factory Specifications: | Warehouse facility with significant stockholding, global logistics network, bespoke assembly manufacturing capabilities. |
| Certifications: | High-quality manufacturing standards with comprehensive testing protocols, working relationships with leading global suppliers and manufacturers. |
Best for Specialized Hermetic Sealing and Vacuum Applications
6. Jacarem Ltd
Jacarem Ltd is a UK manufacturer and distributor with almost 40 years of expertise in hermetic connectors, electrical connectors and custom cable assemblies. They’ve built a reputation as a technical specialist serving demanding applications (aerospace, medical devices, vacuum systems, industrial equipment) where environmental sealing is non-negotiable.
The company operates as a franchise distributor for premium connector brands including Positronic (since 1987), ODU (15+ years), ERNI, Conec, Souriau, Sonitron and others, while also manufacturing custom cable assemblies in house.
Jacarem’s unique strength lies in hermetic sealing solutions, including custom vacuum flanges, hermetic feedthroughs and sealed cable assemblies tested with pressure and helium leak testing. Their cable assembly capabilities range from simple ribbon cables to complex wiring looms with all staff trained to IPC/WHMA-A-620 standards.
Their manufacturing processes adhere to BS EN ISO 9001:2015 quality standards with comprehensive testing protocols including pressure leak tests, helium testing, high voltage testing and continuity testing.
As a stocking distributor, Jacarem maintains extensive inventory of connectors and cables, enabling cost effective pricing and faster turnaround times. Their technical team provides design assistance for new applications, cross-referencing existing products, and custom hermetic solutions manufactured to your exact project specifications.
| Pros | Cons |
|---|---|
| ✅ Specialised 37-year focus on vacuum feedthroughs and custom sealed solutions for demanding applications. | ❌ Limited scope may not suit high volume standard cable assembly requirements. |
| ✅ Long term partnerships with premium brands plus in house cable assembly capabilities. | |
| ✅ Deep application knowledge and design assistance rather than just product supply. |
Key Specs
| Years of Experience: | 37+ years (established 1987). |
|---|---|
| Factory Specifications: | Single facility in Chesham, Buckinghamshire, in house cable assembly division with IPC/WHMA-A-620 trained staff, testing including pressure leak, helium, high voltage, continuity testing, stocking distributor with extensive connector inventory. |
| Certifications: | BS EN ISO 9001:2015 (quality management system), IPC/WHMA-A-620 (cable and wire harness assembly). |
Best for Cost-Effective Alternatives with Global Partnership Network
7. Leotronics
Leotronics is a family-run electronics supplier, specialising in electronic connectors and custom cable assemblies. Since starting over 30 years ago, they’ve evolved into an internationally recognised supplier serving electronics and technology industries.
As a founding member of the Conexcon Group and sole UK distributor for Cvilux Group, Leotronics provides cost effective alternatives to premium manufacturers while maintaining quality standards that rival any of the top custom cable assemblies companies in the UK.
The company operates a dual model combining distribution and manufacturing, allowing them to offer competitively priced alternatives to high-end manufacturers without compromising on quality. Their cable assembly services range from simple individually crimped wires to complex custom molded assemblies and pre-formed cable looms.
Leotronics holds ISO 9001:2015 certification alongside UL and CSA certifications, with RoHS compliance across their product range. Their advanced warehouse systems enable next-day delivery on stocked items and promises 24-hour response times to orders and queries, which is ideal for those who need fast delivery.
| Pros | Cons |
|---|---|
| ✅ Competitive pricing through global partnerships while maintaining form, fit, function compatibility. | ❌ Family-run business may have capacity constraints for very large volume requirements. |
| ✅ Lower minimum orders than brand leaders with UK stock enabling next-day delivery. | |
| ✅ Conexcon Group membership and multiple supplier relationships providing sourcing flexibility. |
Key Specs
| Years of Experience: | 35 years (established 1990, family-run business). |
|---|---|
| Factory Specifications: | UK-based operations with advanced warehouse system, global sourcing network through Conexcon Group partnerships. |
| Certifications: | ISO 9001:2015 (quality management system), UL certification, CSA certification, RoHS compliance, ISO 14001:2004 Environmental Management. |
Best for Comprehensive Testing and Quality Assurance
8. St Cross Electronics
St Cross Electronics has been operating for over 45 years with “Quality is KEY” as their core motto. The company has built a solid reputation serving high end industries including aerospace (Boeing Dreamliner), medical, telecommunications and even motorsport.
The company owns a 10,000+ square foot facility in Southampton, with tooling that ranges from robotic CNC machines to intricate hand tools. Their engineering team offers in house CAD facilities, design support, technical drawings and rapid prototyping from first conception to full production.
Every cable assembly undergoes 100% electrical testing using Cirris test machines, with capabilities for low/high pot testing up to 1,500V. The company guarantees excellent functionality of every harness they produce, supporting this with comprehensive traceability records maintained electronically for minimum 10 years and offering “first off build approval” services.
| Pros | Cons |
|---|---|
| ✅ 100% electrical testing guarantee with 45+ year “Quality is KEY” philosophy. | ❌ High-quality focus and extensive testing may come at higher costs than commodity suppliers. |
| ✅ In house CAD, design for manufacture, prototyping and box build capabilities for turnkey solutions. | |
| ✅ Comprehensive global manufacturing network with consistent quality standards. |
Key Specs
| Years of Experience: | 45+ years (established 1979). |
|---|---|
| Factory Specifications: | 10,000+ sq ft in Southampton, Hampshire, discrete wires to 1000-circuit looms, batch sizes 1 to 100,000+, robotic CNC machines to hand tools, Cirris electrical testing systems. |
| Certifications: | ISO 9001:2015 (quality management, held since 1990), ISO 14001:2015 (environmental management), ISO 45001:2018 (occupational health & safety), UL approval: ZPFW2.E338838 and ZPFW8.E338838, 100% electrical testing guarantee with 10-year traceability. |
Best for Regional UK Contract Manufacturing
9. MSH Electronics
MSH Electronics is based near Wimborne, Dorset. This custom cable assemblies company serves UK businesses from their compact 2,000 sq ft facility. Despite having a much smaller factory than most, they’ve built a reputation as a reliable partner that delivers ISO 9001 certified product quality, timely deliveries and competitive pricing.
The company’s staff are fully trained and approved to IPC/WHMA-A-620 Classes 1, 2 and 3 standards, ensuring compliance with industry requirements for cable and wire harness acceptance. They’re able to handle both prototype development and small-to-medium batch production runs.
MSH’s service offering extends beyond cable assembly to include PCB assembly, module assembly and electronic prototyping services, positioning them as a one-stop solution for UK companies who need diverse manufacturing capabilities under one roof.
The company’s real strength lies in their established customer relationships and proven track record of on-time delivery while maintaining exceptional quality standards.
| Pros | Cons |
|---|---|
| ✅ Over 35 years of established UK manufacturing heritage with strong regional presence. | ❌ Limited facility size (2,000 sq ft) may constrain capacity for large scale production requirements. |
| ✅ IPC/WHMA-A-620 certified staff across all classes ensuring professional cable assembly standards. | |
| ✅ Comprehensive CEM services beyond cable assembly including PCB work and prototyping. |
Key Specs
| Years of Experience: | 35+ years (established late 1980s). |
|---|---|
| Factory Specifications: | 2,000 sq ft facility near Wimborne, Dorset. |
| Certifications: | ISO 9001 (Quality Management System), IPC/WHMA-A-620 Classes 1, 2 & 3 certified operatives for cable and wire harness assemblies. |
Best for Comprehensive Overmoulding and Design Solutions
10. Greenstock
Greenstock operates from a purpose-built 12,000 sq ft facility in Lincolnshire. Founded in 1993, they’ve evolved from serving health and leisure sector OEMs to becoming a comprehensive connectivity solutions provider with over 50 employees serving customers across 15+ countries worldwide.
What sets Greenstock apart from others is their integrated approach combining cable assembly manufacturing with advanced overmoulding capabilities. The company’s IPC-certified staff can build cables to exact specifications while incorporating connectors, ESD suppression products, cable glands and many other features through their extensive moulding facilities covering low and high pressure techniques. This unique combination allows them to deliver complete turnkey solutions rather than just basic assembly services.
Greenstock maintains over 90% UK-based manufacturing with established supply chain relationships spanning nearly 15 years, offering cost effective solutions with short lead times. Their manufacturing capabilities extend beyond cable assembly to include PCB encapsulation, electrical assembly, box builds and even additive manufacturing for prototyping support.
| Pros | Cons |
|---|---|
| ✅ Unique integrated overmoulding capabilities with both low and high pressure solutions for professional, tamperproof finishes. | ❌ Focus on design intensive solutions may result in higher costs for standard cable assembly requirements. |
| ✅ Comprehensive design and development services from concept through to production with 3D printing prototyping capabilities. | |
| ✅ Strong UK manufacturing heritage (90%+ domestic production) with global export reach to 15+ countries. |
Key Specs
| Years of Experience: | 30+ years (founded 1993) |
|---|---|
| Factory Specifications: | Purpose-built 12,000 sq ft facility in Lincoln, Lincolnshire, 50+ employees, extensive moulding facilities with both UK and LCE manufacturing options. |
| Certifications: | ISO 9001:2015 certification, IPC-certified staff, IPC WHMA-A-620 certified assembly operatives for wiring harnesses. |
Top Custom Cable Assemblies Companies UK Conclusion
Custom cable assemblies companies in the UK are varied. From Cloom Tech’s rapid prototyping and global scalability to specialised providers like Scott Cables’ RF expertise and Jacarem’s hermetic sealing solutions, there’s something for every cable need.
Choose a cable assemblies company whose strengths align with your project’s needs. Look at production volumes, technical details, certifications and delivery timelines when deciding. The right partner can save you time, reduce costs, and make the process easier.
For projects requiring exceptional turnaround times combined with industry-standard certifications and competitive pricing, Cloom Tech’s proven track record and global manufacturing network make us an excellent starting point for your evaluation process. Get your free quote!
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