Company lists · Data refreshed September 2026
Top 25 Mechanical assembly companies based in the United States
RevenueBase identified 1,379 mechanical assembly companies headquartered in the United States as of September 2026 and tracks 30,356 professional contacts across them, including 7,313 with verified work emails. San Jose is the largest hub.
This list covers mechanical assembly companies headquartered in the United States, matched on what each company actually does as described in its own words. Ranked by team size, largest first. Every row shows the company's own description, its RevenueBase Smart Search rating, and when it was last checked. Data refreshed September 20, 2026.
Published by RevenueBase, a B2B data infrastructure company. This list was built with RevenueBase Smart Search, the natural-language company search RevenueBase customers use to build their own targeted lists and unlock verified emails and direct dials at the companies on them. How these lists are built and judged.
The 25 largest mechanical assembly companies based in the United States
Ranked by team size| # | Company | Contacts | |||
|---|---|---|---|---|---|
| 1 | 1,452 contacts → | ||||
Indirect evidence “Founded in 1849, Ducommun is the oldest company in California.” Source: RevenueBase Database · checked Sep 20, 2026Thanks. The Data Team will review it. | |||||
| 2 | 914 contacts → | ||||
Indirect evidence “Janicki is a privately-owned engineering and manufacturing company with locations in Washington and Utah.” Source: RevenueBase Database · checked Sep 20, 2026Thanks. The Data Team will review it. | |||||
| 3 | 906 contacts → | ||||
Indirect evidence “We are more than just a manufacturing and fabricating company.” Source: RevenueBase Database · checked Sep 20, 2026Thanks. The Data Team will review it. | |||||
| 4 | 723 contacts → | ||||
Partial evidence “MICRO is a full service contract manufacturer that draws on more than 80 years of experience in medical device assembly, precision metal stamping, insert and injection molding…” Source: RevenueBase Database · checked Sep 20, 2026Thanks. The Data Team will review it. | |||||
| 5 | 499 contacts → | ||||
Partial evidence “Founded in 1973, Tessy Plastics is a global contract manufacturer headquartered in Skaneateles, NY, specializing in injection molding and custom automated assembly solutions.” Source: RevenueBase Database · checked Sep 20, 2026Thanks. The Data Team will review it. | |||||
| 6 | 472 contacts → | ||||
Partial evidence “As a global supplier of precision engineered assemblies, we design, engineer and manufacture things that move.” Source: RevenueBase Database · checked Sep 20, 2026Thanks. The Data Team will review it. | |||||
| 7 | 401 contacts → | ||||
Partial evidence “Hatch is recognized as a world class leader in the design and manufacturing of metal stampings and assemblies.” Source: RevenueBase Database · checked Sep 20, 2026Thanks. The Data Team will review it. | |||||
| 8 | 359 contacts → | ||||
Partial evidence “Since 1937, Paslin has been a leading innovator in the concept, design, construction and deployment of manufacturing assembly and automation systems.” Source: RevenueBase Database · checked Sep 20, 2026Thanks. The Data Team will review it. | |||||
| 9 | 354 contacts → | ||||
Partial evidence “O’Neal Manufacturing Services (OMS) is a supplier of fabricated metal components and welded assemblies.” Source: RevenueBase Database · checked Sep 20, 2026Thanks. The Data Team will review it. | |||||
| 10 | 272 contacts → | ||||
Indirect evidence “Ascentec Engineering was founded in 2001 by a team of process and manufacturing engineers all with a solid background in electronics manufacturing processes.” Source: RevenueBase Database · checked Sep 20, 2026Thanks. The Data Team will review it. | |||||
| 11 | 254 contacts → | ||||
Partial evidence “Penn United provides MANUFACTURING SOLUTIONS for customers needing precision components or precision-assembled products.” Source: RevenueBase Database · checked Sep 20, 2026Thanks. The Data Team will review it. | |||||
| 12 | 233 contacts → | ||||
Indirect evidence “Established in 1946, Major Tool & Machine started business as a custom job shop specializing in the production of tooling and aircraft ground support equipment and has since…” Source: RevenueBase Database · checked Sep 20, 2026Thanks. The Data Team will review it. | |||||
| 13 | 231 contacts → | ||||
Partial evidence “i3 Assembly LLC is dedicated to advancing our competitive excellence from development through full-scale production manufacturing.” Source: RevenueBase Database · checked Sep 20, 2026Thanks. The Data Team will review it. | |||||
| 14 | 229 contacts → | ||||
Strong evidence “NIC Global is a single-source manufacturer providing turn-key mechanical and electromechanical assembly, expert sheet metal fabrication, and global sourcing of metal and plastic…” Source: RevenueBase Database · checked Sep 20, 2026Thanks. The Data Team will review it. | |||||
| 15 | 227 contacts → | ||||
Partial evidence “Morton Industries is a leading manufacturer of Fabricated Tube and Sheet Metal Assemblies.” Source: RevenueBase Database · checked Sep 20, 2026Thanks. The Data Team will review it. | |||||
| 16 | 226 contacts → | ||||
Indirect evidence “Full-service manufacturer.” Source: RevenueBase Database · checked Sep 20, 2026Thanks. The Data Team will review it. | |||||
| 17 | 213 contacts → | ||||
Partial evidence “Precision Automation Custom-engineered, high speed precision assembly and inspection solutions that solve your most complex manufacturing challenges at scale.” Source: RevenueBase Database · checked Sep 20, 2026Thanks. The Data Team will review it. | |||||
| 18 | 179 contacts → | ||||
Strong evidence “Since 1984, MASS has excelled in the custom contract manufacture of electronic chassis, frames, fabrications and turn-key electro-mechanical assemblies built to customer…” Source: RevenueBase Database · checked Sep 20, 2026Thanks. The Data Team will review it. | |||||
| 19 | 177 contacts → | ||||
Indirect evidence “Hi-P is a well known global contract manufacturer who specializes in complex electromechanical components.” Source: RevenueBase Database · checked Sep 20, 2026Thanks. The Data Team will review it. | |||||
| 20 | 173 contacts → | ||||
Indirect evidence “Acme Industries is a full-service, contract manufacturing company.” Source: RevenueBase Database · checked Sep 20, 2026Thanks. The Data Team will review it. | |||||
| 21 | 167 contacts → | ||||
Partial evidence “Matric Group is a contract manufacturer of electronic assemblies, offering world-class Electronic Manufacturing Services (EMS) with personalized customer support, working closely…” Source: RevenueBase Database · checked Sep 20, 2026Thanks. The Data Team will review it. | |||||
| 22 | 160 contacts → | ||||
Strong evidence “PEKO is a leading contract manufacturer providing full-service, end-to-end manufacturing of large-scale machinery, complex equipment, and major electro-mechanical assemblies for…” Source: RevenueBase Database · checked Sep 20, 2026Thanks. The Data Team will review it. | |||||
| 23 | 156 contacts → | ||||
Partial evidence “LM Manufacturing provides manufacturing, assembly, sequencing, supply chain and logistics management for complete seat assemblies and other value-added modular assemblies for…” Source: RevenueBase Database · checked Sep 20, 2026Thanks. The Data Team will review it. | |||||
| 24 | 155 contacts → | ||||
Indirect evidence “At Emerald Technologies, we provide our customers with world-class service experiences built on strong partnerships, flexible manufacturing capabilities, and expert engineering…” Source: RevenueBase Database · checked Sep 20, 2026Thanks. The Data Team will review it. | |||||
| 25 | 152 contacts → | ||||
Indirect evidence “Cypress Industries is a leading, global vertically-integrated contract manufacturer.” Source: RevenueBase Database · checked Sep 20, 2026Thanks. The Data Team will review it. | |||||
RevenueBase Smart Search
RevenueBase Smart Search assesses information from a company’s LinkedIn profile, information supplied directly by the company, its website, and other publicly available sources. It uses that information to rate how closely the company relates to this list’s category: mechanical assembly companies. Every row carries its rating and the description the rating was read from, so each one can be checked rather than taken on trust.
- Strong evidence
- The company's own public description of its business names mechanical assembly companies.
- Partial evidence
- Its own public description names part of mechanical assembly companies, so it works in or next to the category without describing itself that way.
- Indirect evidence
- The description shown does not name mechanical assembly companies. The match rests on the rest of the company's public profile rather than the one sentence quoted here, so this is the rating to check first.
RevenueBase Smart Search is how these lists are built: RevenueBase's data engine and AI assemble the companies that match a category defined in a user's own words, so a list can be about what companies actually do rather than about whichever industry code they were filed under.
Showing 25 of 1,379 mechanical assembly companies based in the United States
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Mechanical assembly companies based in the United States at a glance
As of Sep 20, 2026Companies by employee count
Email recency for this list is measured worldwide rather than for United States, so it is reported there. Company counts and contact totals on this page are exact for United States, over 1,379 companies.
How this list was built
Company categories are rarely black and white. RevenueBase reads each company's own description of its business to decide whether it belongs among mechanical assembly companies, so some rows will be adjacent to the category rather than pure plays. The description and RevenueBase Smart Search rating on every row are there so you can check each match yourself.
- Source
- The RevenueBase company graph: 60 million companies and 398.9 million professional contacts resolved from primary sources, queried with RevenueBase Smart Search, the natural-language company search available to every RevenueBase user.
- What qualifies
- Companies headquartered in the United States whose own description of what they do matches “mechanical assembly companies”. Matching reads each company's description, not its industry code or its name.
- RevenueBase Smart Search
- RevenueBase Smart Search is how this list is assembled and how each row is rated. RevenueBase's data engine and AI assess a company's LinkedIn profile, information supplied directly by the company, its website and other publicly available information, then relate it to a category defined in a user's own words. Each row is rated strong evidence (its own description names mechanical assembly companies), partial evidence (it names part of the category) or indirect evidence (the description shown names none of it and the match rests on the rest of the company's profile). The description supporting each rating is quoted on the row.
- What we exclude
- Companies whose own description does not clearly place them among mechanical assembly companies, and records with no verified work email. Companies headquartered outside United States are excluded even when they keep an office there.
- Match quality
- In blind human judging of this matching method, 86% of matched companies were on target. Expect roughly 1 in 7 rows to be adjacent to the category rather than a pure play. Every row shows the company's own description and its RevenueBase Smart Search rating so you can judge each match yourself. Read the full methodology: how the lists are built, how the judging worked, and what the figure means.
- Ranking
- Team size, largest first: companies are ordered by the number of professionals RevenueBase tracks at each one. Employee ranges shown are reported bands, for context.
- Verification
- Every listed company carries at least one verified work email, 7,313 across the full list. Contacts re-verify on a rolling cadence, and each contact's own verification date is shown inside RevenueBase.
- Refresh
- This page's figures were pulled from the company graph on September 20, 2026. Lists refresh periodically as the graph is re-checked.
- Corrections
- Wrong category, wrong headquarters, or a company that has closed? Use “Report an issue” on any row. Reports go to the RevenueBase Data Team and feed back into the company graph.
Frequently asked
What is RevenueBase Smart Search?
RevenueBase Smart Search is how RevenueBase decides which companies belong on this list and how strongly each one fits. Its data engine and AI assess a company's LinkedIn profile, information supplied directly by the company, its website and other publicly available information, then relate it to the category the list is about. Each row is rated strong evidence when the company's own description names mechanical assembly companies, partial evidence when it names part of the category, and indirect evidence when the description shown names none of it and the match rests on the rest of the company's profile.
How many mechanical assembly companies are there based in the United States?
RevenueBase identified 1,379 mechanical assembly companies headquartered in the United States as of September 2026, matched on each company's own description of what it does rather than its industry code.
What is the largest company on this list?
Ducommun Incorporated, headquartered in Costa Mesa, tops this list with the largest team on record.
Which city has the most mechanical assembly companies?
San Jose leads with 21 headquartered companies, followed by Rochester (15) and Fremont (12).
How do I get contact information for these companies?
A free RevenueBase account lets you run this exact search and work the top results, verified emails and direct dials included. Upgrading unlocks all 7,313 verified decision-maker contacts tracked across these 1,379 companies.
How current is this list?
The list refreshes periodically as the company graph is re-checked. This page's figures were pulled on September 20, 2026.
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About this data
RevenueBase is a B2B data infrastructure company. Its company graph covers 60 million companies and 398.9 million professional contacts, with emails verified on a rolling cadence rather than scraped once and left to decay. These company lists are generated directly from that graph with RevenueBase Smart Search, the same natural-language company search every RevenueBase user has: describe a market in plain words, get the companies that match, and add verified emails and direct dials for the people at them. It is the same data that powers RevenueBase's B2B data products, and a free account includes 500 credits to start. How these lists are built and judged.
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