Custom cable assemblies power important (and sometimes life-saving) applications across industries, from medical equipment to aerospace platforms. But not all custom cable assembly manufacturers are equal, and choosing the right one directly impacts your product’s reliability, compliance and your time to market.
We’re highlighting the top 11 custom cable assembly manufacturers, chosen for their certifications, production capabilities and proven performance. While Cloom Tech ranks highest for combining speed, quality and cost-effectiveness, each company featured here brings unique strengths to match different projects needs.
How We Chose These Custom Cable Assembly Manufacturers
To create this list, we applied clear evaluation criteria that reflect what engineers and procurement teams actually need from a supplier:
- Quality Management Systems: We prioritized manufacturers holding recognized certifications like ISO 9001, IATF 16949, AS9100 and IPC/WHMA-A-620, backed by documented quality control, traceability and detailed inspection processes.
- Manufacturing Capabilities: We assessed production scale, automation levels and access to advanced equipment. Extra consideration was given to companies with special processes like overmolding, sealing or high-frequency builds.
- Technical Expertise: The companies we chose demonstrated hands-on engineering support, deep knowledge of materials and the ability to solve complex application challenges beyond just standard assembly work.
- Business Performance: We looked at proven industry track records, customer references and stability to confirm these companies’ long-term reliability as a supplier.
- Service Excellence: Finally, we considered how communicative the company is, their project management abilities and their level of technical support.
Top 11 Custom Cable Assembly Manufacturers
1. Cloom Tech
Cloom Tech is a custom cable assembly manufacturer focused on assemblies built strictly to their customers’ specifications. Their biggest strength lies in speed and flexibility, with prototypes delivered in as little as three weeks and full-scale production in four to five, speeding up your time to market.
Thanks to their strong partnerships with suppliers like Future Electronics, Arrow and Mouser, they’re able to secure high-quality components at competitive prices. With facilities in China and the Philippines, Cloom Tech supports projects across automotive, medical, aerospace, industrial automation and consumer electronics, giving you a scalable solution from small runs to high-volume production.
| Pros | Cons |
|---|---|
| ✅ Specialize in complex harnesses with wire gauges ranging from 40 AWG to 120 mm². | ❌ Being a young company, they may be seen as less experienced despite extensive team expertise. |
| ✅ Equipped with automated wire stripping, laser marking (AS50881 compliant), double-ended terminal crimping, semi-automatic soldering and micro terminal testing. | |
| ✅ Factories in China and the Philippines provide scalable production options. |
Key Specs
| Operating Since: | 2016 (9 years). |
|---|---|
| Factories: | The primary production facility is based in Hebei, China, supported by additional manufacturing sites in the Philippines. |
| Certifications: |
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2. Wiringo
Wiringo is a flexible China-based custom cable assembly manufacturer that focuses on wire harnesses, multicore cables and molded assemblies for industrial, consumer and automotive markets. They support simple jumper wires, complex multi-branch harnesses, ribbon cables, molded connectors and high-temperature builds, which makes them useful for teams who need a wide product mix from one supplier.
Wiringo supports small prototype runs as well as larger batches, and they handle UL-listed wires, PVC, silicone, FEP and braided shielding. Their website highlights testing processes, continuity checks and QC inspection before shipment, which gives buyers a level of reassurance when outsourcing overseas.
| Pros | Cons |
|---|---|
| ✅ Offers multi-branch looms with accurate crimp termination, continuity testing and molded strain-relief. | ❌ Don’t offer cable assembly design services. |
| ✅ Supports UL-listed wire, PVC, silicone and braided shielded cable for EMI-sensitive applications. | |
| ✅ Tooling for JST, Molex, TE and Hirose connectors reduces sourcing time and cost. |
3. Molex
Molex might be better known for their connectors, but they actually offer a one-stop solution thanks to their Custom Cable Creator, which allows you to order a specific cable type (including connectors, cable length and more) with very little effort.
The company also owns a Global Reliability Lab, which is where their team of experienced engineers analyze, tweak and optimize designs before production. The Lab follows ISO/IEC 17025 practices, the international gold standard for measurement and validation.
Their custom cable solution portfolio covers automotive, industrial and computing, with production in ISO/TS/IATF-certified facilities and the option of off-the-shelf options where appropriate. For teams that want Tier-1 depth, global factories and rigorous qualification support, Molex is a safe and scalable choice.
| Pros | Cons |
|---|---|
| ✅ Follows practices set out in ISO/IEC 17025, considered the gold standard internationally for laboratory measurement and electronics validation. | ❌ Their size means they may be less flexible for small-volume custom projects. |
| ✅ Designs and fabricates electronic solutions for a wide range of industries. |
Key Specs
| Operating Since: | 1938 (87 years of experience). |
|---|---|
| Factories: | 74 factories located in 19 different countries. |
| Certifications: |
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4. Epec Engineered Technologies
Interestingly, Epec is the oldest PCB company in North America. Not only do they have a long history, but they’ve been part of some massive projects, including supplying PCBs for the Apollo 11 spacecraft!
While cable assemblies are not their primary offering, the company supports overmolded, shielded and mixed-signal harnesses. Their offering includes low-voltage hook-up wire (≤ 300 VDC) to data/signal cables (eg. D-Sub, USB, HDMI, Ethernet) and coax/RF assemblies. They operate globally (US, China, Malaysia) and offer both short-run prototypes and volume production.
| Pros | Cons |
|---|---|
| ✅ Manufactures overmolded cable assemblies, shielded cables, flat flex/ribbon cables (2 to 60+ conductors, 0.050” pitch 28 AWG as a known design) and coaxial lines. | ❌ Being a PCB company rather than a dedicated custom cable assembly manufacturer may make some potential customers unsure of their quality. |
| ✅ Use SOLIDWORKS for custom cable layouts and accept STP files for 3D prototyping, enabling early design validation and reduced risk. | |
| ✅ Supports both low-volume/high-mix runs and scalable high-volume production. |
Key Specs
| Operating Since: | 1952 (73 years). |
|---|---|
| Factories: | Headquarters in New Bedford, Massachusetts, Advanced Technology Center in Lake Forest, California and operations in Shenzhen, China, and Senai, Johor, Malaysia. |
| Certifications: |
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5. JEM Electronics Inc.
JEM Electronics has been in business for almost half a century, under the same CEO for all that time, too. One of their strong points is being able to offer both domestic manufacturing in their Franklin, MA factory, and offshore manufacturing in their Tijuana facility, so there’s an option for every budget and timeframe.
Both facilities are certified, including UL/CSA registrations and ITAR for sensitive projects. The company supports orders of low and high volumes, making it easy to scale when necessary or stick to smaller orders when you need.
They cover industries from aerospace to robotics, making them a versatile partner with regional supply, audited quality and responsive engineering.
| Pros | Cons |
|---|---|
| ✅ Offers options for domestic production (for sensitive or ITAR-governed work) and offshore cost efficiencies. | ❌ Mid-sized operation that may have capacity limitations for very large scale projects. |
| ✅ Handle assemblies for critical environments (medical, defense, oil & gas, networking) and support custom requirements such as shielding, moisture resistance and ruggedized builds. | |
| ✅ Produces assemblies built to military standards such as MIL-C-17 (coaxial) and MIL-DTL-3432 (power distribution), supporting high reliability under vibration, temperature extremes and EMI conditions. |
Key Specs
| Operating Since: | 1981 (44 years). |
|---|---|
| Factories: | 30,000-square-foot facility in Franklin, MA and a second manufacturing facility in Tijuana, Mexico. |
| Certifications: |
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6. ECE Electronics
ECE Electronics offers end-to-end cable assembly services anchored in Europe and the UK. Their services include custom wire harnesses, shielded cables, overmolded assemblies and complex multi-connector looms.
They have five certified factory sites across the UK, the Netherlands and Romania, along with logistics and supply chain offices so they can serve the European market efficiently. Their heavy investment in automation and broad connector/tooling inventories (Molex, JST, DEUTSCH, Hirose, TE) helps reduce lead times and variation in builds.
ECE positions themself especially well for projects in Europe or the UK where regulations, logistics or proximity matters.
| Pros | Cons |
|---|---|
| ✅ Run fully automatic Komax 255 and automated wire processing machines to minimize human error in production. | ❌ Specific turnaround times for prototypes and samples are not clearly stated. |
| ✅Stock a wide range of connector systems and crimping tooling which allows faster changeovers, reduced lead times for unusual parts and continuity in builds even if specs shift. | |
| ✅ Supports everything from schematic & layout input to full production and testing. |
Key Specs
| Operating Since: | 1985 (40 years of experience) |
|---|---|
| Factories: | 5 dedicated factories in Basingstoke, Hampshire; Abertillery, Wales; Amsterdam, Netherlands; Petroșani and Aninoasa in Romania. |
| Certifications: |
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7. Onanon
Onanon is one of the largest custom OEM manufacturers in North America and leans hard into automation, using automated pin-loading and proprietary RoboSolder termination to lower costs and increase consistency. Their Milpitas facility is ISO 9001 and 13485 certified, offering rapid prototyping and in house manufacturing.
Their capabilities extend across industries, with application-specific interconnects to make sure they provide the best quality cable assemblies for every use. North American companies who want tight production and automated processes would partner well with Onanon.
| Pros | Cons |
|---|---|
| ✅ Pin-loading automation can handle ~2,000 contacts per minute, streamlining high-volume builds with minimal manual labor. | ❌ Manufacturing is restricted to one facility, which may limit geographic accessibility for some customers. |
| ✅ RoboSolder system with customizable templates reduces risks of cold joints or misalignment. | |
| ✅ Explicitly support 30 to 50 AWG wires, overmolding in TPU, silicone, etc, and can integrate embedded electronics or circuit elements within connector assemblies. |
Key Specs
| Operating Since: | 1979 (46 years). |
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| Factories: | 27,000 square-foot facility in Milpitas, California. |
| Certifications: |
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8. Cables Unlimited
A US manufacturer with extensive customization and fast turns, one of Cables Unlimited’s biggest advantages over others is that they’re an approved Corning Gold Cable Assembly House. This allows them to offer a 25-year extended warranty on certain fiber products, so if that’s what you need, they’re well worth considering.
If you need a different kind of cable assembly, they’re still a great option. They’re a particularly good choice if you’re looking for hybrid fiber and copper mixes, and their portfolio spans custom assemblies, wire harnesses, fiber, and hybrids for military, medical, industrial, and communications markets.
| Pros | Cons |
|---|---|
| ✅ Specialize in “Made in USA” custom cable assemblies. | ❌ Lack international manufacturing facilities which may impact delivery times and costs for overseas customers. |
| ✅ IP‑rated outdoor assemblies operate from –40 °C to +85 °C, support trunk diameters from 4.5 to 18 mm, and provide tensile ratings for robust mechanical performance. | |
| ✅ Produce MIL‑spec fiber assemblies with rugged environment resilience (eg. TFOCA, MIL‑C‑27500). |
Key Specs
| Operating Since: | 1992 (33 years) |
|---|---|
| Factories: | One facility in Yaphank, New York. |
| Certifications: |
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9. Technical Cable Applications
TCA provides custom and OEM cable manufacturing with in-house prototyping, test and inspection. They’re UL‑certified for wiring harnesses under categories ZPFW2 (US) and ZPFW8 (Canada) under file E363245, meaning they can produce harnesses as UL-recognized components in response to safety and traceability audits.
To serve global clients, TCA partners with two nearshore manufacturing facilities in Guadalajara, Mexico, which means lower costs, reduced tariffs, faster lead times and better control than more distant offshore alternatives.
Their technology also uses automated work-instruction systems and traceability for consistent execution across batches, allowing them to maintain consistency with ease. If you need niche builds, including large-gauge or locomotive cables, without sacrificing documentation, TCA is a strong contender.
| Pros | Cons |
|---|---|
| ✅ Use of Scout Systems enables each wire, connector and assembly step to be traced and audited, which reduces variance and supports quality investigations. | ❌ They remain a smaller manufacturer compared to some larger international competitors, which may limit their capacity for very large-scale orders. |
| ✅ Support a wide variety of cable types (eg. molded/overmolded assemblies, RF/coax, M12, custom power and signal wires) and maintain inventories of common connectors and crimping tooling. | ❌ Some specs (eg. current or voltage limits, environmental testing results, longest harness lengths, max gauge) are not clearly detailed in public materials. |
| ✅ Advanced equipment and testing allows them to provide niche cable assembly types that many other manufacturers can’t. |
Key Specs
| Operating Since: | 2002 (23 years). |
|---|---|
| Factories: | Auburn, Washington, and partnered with 2 prominent manufacturing facilities in Guadalajara, Mexico. |
| Certifications: |
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10. Electro Soft
Electro Soft is an effective custom cable assembly manufacturer run by a highly experienced team where most members have been with the company a decade or more. They manufacture custom cable assemblies and harnesses on-shore in Pennsylvania, coupling ISO 9001 certification with 100% test and documented JIT programs.
Electro Soft is UL- and CSA-recognized and is ITAR-registered, giving them legitimacy in regulated domains. Their electronics division also uses wave soldering, reflow and pick-and-place systems, indicating that they have capabilities for box-build integration beyond just cable/harness work.
Because everything is manufactured domestically with no outsourcing, the company appeals to customers who value traceability, control over quality, and logistics simplicity.
| Pros | Cons |
|---|---|
| ✅ Also performs PCB assembly (SMT, through-hole), cabinet/box builds, wiring integration and full-electronics modules in-house. | ❌ Operations are concentrated in one Pennsylvania facility, which may create challenges for customers requiring closer geographic proximity. |
| ✅ 100% testing with a quality and on-time delivery rating consistently greater than 97%. | ❌ Publicly available documents do not disclose detailed environmental/performance ratings for their harnesses or cables. |
| ✅ Assemble everything locally in Pennsylvania, avoiding overseas manufacturing issues like supply chain delays, substandard quality and excess carbon emissions. |
Key Specs
| Operating Since: | 1986 (39 years) |
|---|---|
| Factories: | 16,000 square-foot facility in Montgomeryville, PA. |
| Certifications: |
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11. WellPCB
WellPCB is actually a PCB company, but they double up as a surprisingly effective custom cable assembler and wire harness manufacturer. They offer wire harness manufacturing for several industries, including robotics, marine, and aerospace. One of their biggest pros is having no minimum order quantity, so you can come to them for tiny orders of just a few products or orders of 100,000 or more.
They have dedicated PCB facilities and separate wiring harness factories. If your business happens to need circuit boards and cable assembly, they’re the perfect partner.
| Pros | Cons |
|---|---|
| ✅ Multiple manufacturing facilities, serving over 3,000 customers. | ❌ Ship from China, which may result in longer shipping times and higher costs for customers outside Asia. |
| ✅ 98% customer positive evaluation and satisfaction for received cable assemblies. | ❌ WellPCB primarily focuses on PCBs, which may make them less experienced for cable assembly compared to other manufacturers on this list. |
Key Specs
| Operating Since: | 2007 (18 years) |
|---|---|
| Factories: | Two PCB fabrication plants (Shenzhen and Jiangmen), two PCB assembly factories (Shijiazhuang and Shenzhen), and one wire harness production facility in Shijiazhuang. |
| Certifications: |
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Final Thoughts
More than one of the custom cable assembly manufacturers on this list could be a good fit for your needs. Once you’ve identified the ones that match your needs, you can choose the one that stands out the most or, if necessary, run a prototype test with a few different manufacturers.
While you’re deciding, why not get a free quote from Cloom Tech? No obligation, just a good idea of how to take your project from idea to reality. Contact us today!
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