How to Choose a Custom Cable Assembly Manufacturer

Disclosure: This guide is published by Cloom Tech. Cloom Tech is one of the nine companies listed below, and the decision block at the end is a sponsored, disclosed element that routes you to Cloom Tech.

Custom cable assembly work ranges from simple molded jumper cables to complex multi-branch harnesses built to a customer’s own drawing. The company you pick affects prototype speed, quality documentation, and whether the finished assembly holds up in the field. This guide does not rank suppliers. It sets out the questions to ask and gives the same facts for each company so you can compare them yourself.

What should I check before shortlisting a custom cable assembly manufacturer?

Use these criteria for every company in this guide:

• Quality system: which certifications the company publishes, and at which sites.
• Where the assembly is built: the company’s own stated locations. Some suppliers list a headquarters in one country and production somewhere else entirely.
• Scale and programme fit: facility count, headcount, and whether the company publishes figures that suit your volume.
• Product scope: whether the company publishes custom-assembly work specifically, versus only off-the-shelf or catalogue parts.
• Industry fit: which industries the company’s own site actually names, and whether that matches your end use (medical, industrial, automotive, telecom, and so on).

Figures below come from each company’s own website unless marked otherwise. Anything a company did not publish is left out, not estimated.

Which custom cable assembly manufacturers serve non-defense buyers?

The nine companies are listed in alphabetical order. Order does not indicate quality or preference.

Cables Unlimited

• Founded: not published on the company’s own site as of this check (third-party sources disagree with each other, so not used).
• Scale (company-stated): not published as an employee count on the pages checked.
• Locations: 3 Old Dock Rd, Yaphank, NY 11980. The company’s own site states its products are built in the United States.
• Certifications (company-stated): REACH and RoHS compliance, stated on its medical-cables product page. Its homepage also names a “Corning Gold Cable Assembly House” status for its fiber optic line.
• Product focus: custom medical cable assemblies — coil cords, connectors and assemblies for hospitals and medical equipment manufacturers, including Class III device applications such as operating room technologies, ventilators, diagnostic imaging, patient monitoring, RF ablation systems, EEG, ECG/EKG, pulse oximetry, and surgical uses, using materials including PVC, polypropylene, FEP, TPE, and polyethylene, plus non-magnetic RF connectors for use near medical imaging equipment. Also offers fiber optic cable assemblies through its Corning Gold partner status.

Trade-offs:

• Strength: a dedicated medical-cable product line built around device-classification-aware design (including Class III) and non-magnetic RF connectors for imaging environments, plus a named Corning Gold fiber-optic partner status.
• Limit: the company’s own site does not publish a founding year, employee count, or a quality-system certification beyond REACH/RoHS for its medical line (no ISO 9001 stated on the pages checked), so ask directly for its current quality certificate. Only one stated facility (Yaphank, NY), so confirm capacity for your volume.

Cloom Tech (Hebei Cloom Electronic Technology Co., Ltd)

Cloom Tech is one of the nine companies in this guide. Its facts below use the company’s confirmed reference data.

• Founded: 2017.
• Locations: Shijiazhuang, Hebei, China (headquarters and plant, 5,000 m² factory space); Cavite, Philippines (plant, near Manila); Medley, Florida, USA (office).
• Scale (company-stated): 1,000+ cumulative clients since 2017.
• Certifications (company-stated): ISO 9001; IATF 16949 (valid to August 2029); ISO 13485 (medical wire-harness production); IPC/WHMA-A-620E CIS (operator and inspector qualification).
• Product focus: custom cable assemblies and custom wire harnesses built to customer specifications. Cloom Tech does not sell standalone connectors, does not sell standard or pre-built cables/harnesses, and does not offer design services — it consults and offers professional recommendations on a customer’s own design.

Trade-offs:

• Strength: a valid IATF 16949 certificate plus ISO 13485, so it can serve automotive and medical-harness buyers from the same facility.
• Limit: Cloom Tech builds in China and the Philippines and has a US office, so confirm where your assembly would be produced and what that means for lead time and cost. It does not supply standalone connectors, standard/pre-built harnesses, or design services — only custom assemblies built to your own spec.

ECE Electronics

• Founded: 1984.
• Scale (company-stated): five facilities; the company’s own site does not publish an employee count.
• Locations: Basingstoke, Hampshire (UK, registered office); Abertillery, Wales (UK); Amsterdam, Netherlands; Petroșani and Aninoasa, Romania.
• Certifications (company-stated): ISO 9001, ISO 14001, IPC-A-610, IPC/WHMA-A-620, and ATEX Directive 2014/34/EU (hazardous-area/explosive-atmosphere equipment compliance).
• Product focus: cable assembly (“precision-engineered cable assemblies”) for healthcare, automotive, industrial, IoT, and capital-equipment customers.

Trade-offs:

• Strength: ATEX compliance is a specific, verifiable hazardous-area credential, relevant if your assembly goes into explosive-atmosphere equipment, plus a five-site UK/EU footprint.
• Limit: the company’s own site describes “cable assembly” rather than a dedicated wire-harness line, doesn’t publish employee counts, and doesn’t name IATF 16949 — ask directly if you need automotive-specific quality-system certification.

Electro Soft

• Founded: not stated by year; the company’s own site cites “35 years of experience.”
• Scale (company-stated): one stated facility; no employee count published.
• Locations: 113 Keystone Drive, Montgomeryville, PA 18936.
• Certifications (company-stated): ISO 9001. The company’s own site names no other certification on the pages checked.
• Product focus: custom wire harness assembly, custom cable assembly, PCB assembly (SMT and through-hole), cabinet/enclosure (box build) assembly, and turnkey, batch, and just-in-time contract manufacturing, serving rail, transit, and OEM customers among others.

Trade-offs:

• Strength: one contract manufacturer across wire harness, cable assembly, PCB assembly, and full box build — useful if you want a single supplier across those steps.
• Limit: a single Pennsylvania facility and only one named certification (ISO 9001) on the pages checked, so ask directly about additional quality-system certificates and capacity for larger programmes.

Epec Engineered Technologies

• Founded: not independently confirmed in this pass — the company’s own site cites “70 years of PCB manufacturing experience” rather than stating a specific founding year.
• Scale (company-stated): not published as an employee count on the pages checked.
• Locations: New Bedford, Massachusetts (headquarters, per its cable-assembly processing-capabilities page). The company’s own site also references a “Domestic PCB Factory” and separate “Global Operations”/”Office Locations” pages whose contents weren’t loaded in this pass.
• Certifications (company-stated, cable-assembly page): ISO9001, ISO27001, UL Certified, RoHS Compliant.
• Product focus: custom cable assemblies from low-voltage hookup wire to overmolded breakout assemblies and coaxial assemblies, built to the IPC/WHMA-A-620 standard for assembly, test, and inspection. Capabilities include wire stripping/tinning to tight tolerances, overmolded strain relief, potting, epoxy encapsulation, braided and foil shielding, and adding connectors, PCBAs, switches, fans, or batteries. Conductor range: 4 AWG to 40 AWG, 30V to 3000V, -65°C to +250°C. Named connector partners include Molex, Amphenol, TE/AMP, Samtec, and Souriau.

Trade-offs:

• Strength: a wide conductor/voltage/temperature range and named connector-brand partnerships, plus ISO27001 (information-security) alongside ISO9001 — not common among smaller shops.
• Limit: the processing-capabilities page doesn’t give a founding year or headcount, and doesn’t name IATF 16949, so ask directly about automotive-specific quality-system certification and which of its several referenced facilities would build your order.

Molex

• Founded: 1938 (widely and consistently reported; the company’s own corporate-history pages repeatedly failed to load for this draft, so this date is corroborated rather than independently re-verified from molex.com directly in this pass).
• Scale (company-stated): not independently confirmed in this pass. Secondary sources disagree sharply on headcount and country count, and Molex’s own about/overview pages could not be loaded.
• Locations: not independently confirmed in this pass. Molex’s manufacturing footprint is large and multi-country, but specific site addresses weren’t confirmed directly from molex.com here.
• Certifications (company-stated, industrial-automation cables page): UL/CSA, UKCA, CE, and RoHS, with stated conformance to the DESINA industrial-cabling standard.
• Product focus: custom cable assembly via the Custom Cable Creator online configurator (molex.com/en-us/custom-cable-creator) — customers choose connector family, circuit size, wire gauge, and cable length to get a concept drawing, 3D model, and prototype quote — and a dedicated Cables for Industrial Automation line of custom-engineered signal and control cables.

Trade-offs:

• Strength: a self-serve online configurator for custom cable assembly design, plus a named industrial-automation cable line with DESINA conformance — useful if your programme wants fast concept-to-quote turnaround.
• Limit: Molex’s own corporate pages (about, history, and facility-certification pages) repeatedly failed to load in this research pass, so headcount, total facility count, and which specific plant holds which quality certificate are not confirmed here — ask Molex directly for the current certificate covering the plant that would build your order.

Onanon

• Founded: not stated by year; the company’s own site cites “decades of experience.”
• Scale (company-stated): one stated facility; no employee count published (third-party sources disagree sharply, from roughly 75 to over 10,000, so not used).
• Locations: 720 S Milpitas Blvd, Milpitas, CA 95035.
• Certifications (company-stated): ISO 13485, RoHS, REACH.
• Product focus: medical-device-focused connector and cable assembly manufacturing. Robosolder® is automated fine-wire termination engineered for medical devices; MagConnect® is a magnetic, self-mating connector line for applications such as ultrasound and surgical equipment, and also e-bikes and scooters; SmartConnect® adds embedded electronics for applications such as electrosurgical devices and agricultural equipment; CableConnect® covers custom and build-to-print cable assemblies; BoardConnect® covers custom board-to-board and board-to-cable connectors; and an off-the-shelf catalogue covers standard connectors and cable assemblies.

Trade-offs:

• Strength: ISO 13485 (a medical-device-specific quality system) plus a named automated termination process (Robosolder) built specifically for medical-device reliability.
• Limit: a single Milpitas, CA facility with no published headcount, so confirm capacity for your volume directly; the company’s own site does not state a founding year.

Technical Cable Applications (TCA)

• Founded: 2002, in Auburn, Washington.
• Scale (company-stated): not published as an employee count or total facility size on the company’s own site as of this check.
• Locations: main facility at 1028 4th St NW Suite B, Auburn, WA 98001. The company’s own site also states it manufactures in Mexico and Asia, without naming specific sites.
• Certifications (company-stated): ISO 9001:2015; UL-recognized wiring-harness component certifications (ZPFW2.E363245 for the US, ZPFW8.E363245 for Canada); ITAR registered.
• Product focus: custom and OEM cable assembly, wire harness manufacturing, injection/cable molding, M12 cables and connectors, coaxial/RF cables, prototype wire and testing.
• Industries named on its own site: Industrial, Telecommunications, Medical, Construction, Energy, Manufacturing, Agriculture, Marine. No defense-sector industries are named, and no product category on the pages checked is framed around one.

Trade-offs:

• Strength: UL-recognized wiring-harness certification for both the US and Canada, plus in-house molding and nearshore Mexico/Asia production options.
• Limit: the company’s own site does not publish headcount or total production capacity, so ask directly about scale for your volume. It is ITAR registered — an export-control registration, not by itself a claim about its customer base — so ask what that registration covers for your specific build if compliance scope matters to you.

WellPCB

• Founded: 2007.
• Scale (company-stated): seven manufacturing facilities and three sales offices, per the company’s own site.
• Locations: manufacturing facilities in Shijiazhuang (PCBA), Shenzhen (PCBA and PCB), Jiangmen (PCB), Shijiazhuang (wire harness), Shenzhen (wire harness), and Manila, Philippines (wire harness); sales/support offices in Shijiazhuang (China), Melbourne (Australia), and Warsaw (Poland).
• Certifications (company-stated): ISO 9001:2015; ISO 14001:2015; ISO 13485:2016; IATF 16949:2016; UL certified (E314500); REACH; the company states its products follow IPC and RoHS standards.
• Product focus: custom wire harness manufacturing and custom cable assembly, with stated lead times of 7–25 days depending on the product; harnesses named for automotive, industrial, robotics, medical, solar, agricultural, and general consumer use; visual and AOI inspection as part of its process.
• Industries named on its own site: Robotics & IoT, Medical & Healthcare, Automotive, Power Electronics, LED & Lighting, Railway & Transport, Telecommunications, Consumer Electronics, Industrial PCBs, Security & Surveillance, Energy Sector, plus marine, truck, agricultural equipment, solar, tractor, train, and appliance applications named elsewhere on the site. No defense-sector industries were found anywhere across the pages checked (homepage, wire-harness page, about page, industries page).

Trade-offs:

• Strength: dedicated wire-harness factories in two cities alongside its PCB assembly operations, plus a stated IATF 16949 certification and ISO 13485, useful if you want PCB and harness work from one group.
• Limit: all seven manufacturing facilities are in China and the Philippines, with sales offices only in China, Australia, and Poland — no North American or European production or support office stated, so ask about lead time and local support if that matters to you.

How do I choose between these suppliers?

1. Match certifications to your buyer. If you supply OEMs or regulated end markets (medical, automotive, hazardous-area), ask for the current certificate for the specific site that would build your assembly, not a group-wide claim.
2. Confirm the build location. Headquarters, sales offices, and production sites are often different places. Ask for the plant address in writing.
3. Test prototype speed. Send the same drawing to two or three suppliers and compare lead times and the questions they ask back.
4. Ask directly about industry fit. This guide describes each company’s non-defense work only; several of these companies also do other work their own sites publish elsewhere (for example, some hold additional industry-specific certifications beyond what’s listed here). If your programme has specific compliance needs, ask the supplier directly rather than assuming from this guide alone.
5. Check fit with your volume. Facility count and stated scale vary a lot across these nine; ask for a quote at your actual volume rather than assuming fit from company size alone.

Ready to request a quote?

Sponsored (Cloom Tech): If you want Cloom Tech to quote your custom cable assembly or wire harness, send your drawing, expected volumes, and target certifications. Request a quote at the Cloom Tech contact page. See what Cloom Tech builds as a custom cable assembly manufacturer.

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