Company lists · Data refreshed September 2026

Top 25 Custom gearbox manufacturers based in the United States

Name: Custom gearbox manufacturers based in the United States
Creator: RevenueBase
License: https://creativecommons.org/licenses/by/4.0/

Compiled by the RevenueBase Data Team Data refreshed Sep 30, 2026 248 companies tracked

RevenueBase identified 248 custom gearbox manufacturers headquartered in the United States as of September 2026 and tracks 6,616 professional contacts across them, including 2,531 with verified work emails. Cleveland is the largest hub.

This list covers custom gearbox manufacturers 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 30, 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.

How to read this list HQ checked on every row RevenueBase Smart Search rating on every row Refreshed Sep 30, 2026 86% judged on-target in blind review

248Companies

6,616Contacts tracked

2,531Verified emails

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The 25 largest custom gearbox manufacturers based in the United States

Ranked by team size

Top 25 of 248 custom gearbox manufacturers based in the United States, ranked by team size, largest first. Data refreshed Sep 30, 2026. RevenueBase Smart Search rates how each company's information relates to custom gearbox manufacturers: strong evidence (its own description names it), partial (names part of it), indirect (matched on the rest of its profile rather than the description shown). Click a contact count to view that company's people.
#	Company	RevenueBase Smart Search	Headquarters	Employees	Contacts
1	Gleason Corporation	Indirect evidence	Rochester, NY, United StatesHQ checked Sep 30, 2026	1,001-5,000	750 contacts →
	Indirect evidence “Gleason is a global leader in gear technology.” Source: RevenueBase Database · checked Sep 30, 2026
2	Dodge Industrial	Strong evidence	Simpsonville, SC, United StatesHQ checked Sep 30, 2026	1,001-5,000	660 contacts →
	Strong evidence “Dodge Industrial, an RBC Bearings company, designs, manufactures, and supplies customized mechanical power transmission products for a wide range of industries and markets…” Source: RevenueBase Database · checked Sep 30, 2026
3	Team Industries	Indirect evidence	Bagley, NC, United StatesHQ checked Sep 30, 2026	1,001-5,000	487 contacts →
	Indirect evidence “TEAM Industries is a market leader in drive train technology that offers a complete range of services that includes everything from collaboration on product designs to…” Source: RevenueBase Database · checked Sep 30, 2026
4	Hydro-Gear	Partial evidence	Sullivan, IL, United StatesHQ checked Sep 30, 2026	1,001-5,000	423 contacts →
	Partial evidence “Founded in 1991 and headquartered in Sullivan, IL, Hydro-Gear is a world leader in the design and manufacture of precision drive solutions for the commercial, residential, and…” Source: RevenueBase Database · checked Sep 30, 2026
5	Philadelphia Gear, Power Systems By Timken	Indirect evidence	King Of Prussia, PA, United StatesHQ checked Sep 30, 2026	201-500	186 contacts →
	Indirect evidence “Philadelphia Gear® brand enclosed drives are the product of over 130 years of innovative design engineering and manufacturing excellence.” Source: RevenueBase Database · checked Sep 30, 2026
6	Lufkin Gears	Indirect evidence	Lufkin, TX, United StatesHQ checked Sep 30, 2026	501-1,000	164 contacts →
	Indirect evidence “Our Lufkin Gears brand bring a deep history of industry-leading technology to demanding high-speed mechanical-drive, turbo machinery, and marine-propulsion applications.” Source: RevenueBase Database · checked Sep 30, 2026
7	Electrocraft	Partial evidence	Stratham, NH, United StatesHQ checked Sep 30, 2026	501-1,000	161 contacts →
	Partial evidence “The ElectroCraft Powering Innovation custom manufacturing services cover the following products: AC motors, PMDC motors, brushless DC motors, stepper motors, servo motors…” Source: RevenueBase Database · checked Sep 30, 2026
8	PT Tech LLC	Partial evidence	Wadsworth, OH, United StatesHQ checked Sep 30, 2026	51-200	148 contacts →
	Partial evidence “Since 1978, PT Tech has manufactured drivetrain solutions for OEM's in the Mining, Marine, Recycling, Roadworking, Wind Energy, Tunnel Boring, Steel and other markets.” Source: RevenueBase Database · checked Sep 30, 2026
9	Horsburgh & Scott	Strong evidence	Cleveland, OH, United StatesHQ checked Sep 30, 2026	51-200	146 contacts →
	Strong evidence “Horsburgh & Scott, founded in 1886, is one of the world's leading providers of custom industrial gears and gearboxes.” Source: RevenueBase Database · checked Sep 30, 2026
10	Cone Drive	Partial evidence	Traverse City, MI, United StatesHQ checked Sep 30, 2026	501-1,000	121 contacts →
	Partial evidence “Cone Drive engineers and manufactures gearing solutions for precision motion control and mission critical applications.” Source: RevenueBase Database · checked Sep 30, 2026
11	Harmonic Drive LLC	Partial evidence	Beverly, MA, United StatesHQ checked Sep 30, 2026	51-200	112 contacts →
	Partial evidence “Harmonic Drive LLC designs and manufactures precision servo actuators, gearheads and gear component sets.” Source: RevenueBase Database · checked Sep 30, 2026
12	Aero Gear	Partial evidence	Windsor, CT, United StatesHQ checked Sep 30, 2026	201-500	95 contacts →
	Partial evidence “Aero Gear was founded in 1982 as a company that would provide solutions-focused expertise in the design, engineering and manufacturing of gears and gearbox assemblies for the…” Source: RevenueBase Database · checked Sep 30, 2026
13	Wittenstein North America	Strong evidence	Bartlett, IL, United StatesHQ checked Sep 30, 2026	51-200	92 contacts →
	Strong evidence “As manufacturer of the world's first precision planetary gearbox, WITTENSTEIN is a global leader motion control systems for industrial, energy, aerospace, simulation and other…” Source: RevenueBase Database · checked Sep 30, 2026
14	Schafer Industries	Indirect evidence	South Bend, IN, United StatesHQ checked Sep 30, 2026	201-500	90 contacts →
	Indirect evidence “Unlock precision and reliability with Schafer Industries!” Source: RevenueBase Database · checked Sep 30, 2026
15	Auburn Gear	Partial evidence	Auburn, IN, United StatesHQ checked Sep 30, 2026	51-200	84 contacts →
	Partial evidence “Auburn Gear is a mid-sized manufacturer of planetary gears and Select-A-Loc (Open to Lock and Limited to Slip to Lock) and Grip-N-Loc limited slip differentials.” Source: RevenueBase Database · checked Sep 30, 2026
16	Winsmith	Partial evidence	Springville, NY, United StatesHQ checked Sep 30, 2026	51-200	81 contacts →
	Partial evidence “Winsmith manufactures gearing solutions for a wide range of applications.” Source: RevenueBase Database · checked Sep 30, 2026
17	CGI INC	Indirect evidence	Carson City, NV, United StatesHQ checked Sep 30, 2026	51-200	74 contacts →
	Indirect evidence “CGI, Inc.'s core business is manufacturing precision motion control solutions.” Source: RevenueBase Database · checked Sep 30, 2026
18	Groschopp, INC	Partial evidence	Sioux Center, United StatesHQ checked Sep 30, 2026	201-500	70 contacts →
	Partial evidence “Partnering with Groschopp means working with a small electric motor and gear motor manufacturer that strives for the American standard of quality.” Source: RevenueBase Database · checked Sep 30, 2026
19	Brad Foote Gearing	Indirect evidence	Cicero, IL, United StatesHQ checked Sep 30, 2026	201-500	65 contacts →
	Indirect evidence “As an ISO 9001 registered company with an international reputation for superior quality, Brad Foote Gear Works, Inc.” Source: RevenueBase Database · checked Sep 30, 2026
20	ABS Atlantic Bearing Services	Indirect evidence	Miami, FL, United StatesHQ checked Sep 30, 2026	201-500	63 contacts →
	Indirect evidence “Atlantic Bearing Services (ABS) is an international engineering company providing design, manufacturing, repair, and supply solutions for heavy industry.” Source: RevenueBase Database · checked Sep 30, 2026
21	Overton Chicago Gear	Partial evidence	Addison, IL, United StatesHQ checked Sep 30, 2026	201-500	60 contacts →
	Partial evidence “With history dating to OCG manufactures large, high-precision gears that are designed to meet a wide range of requirements for the most challenging applications in the oil and…” Source: RevenueBase Database · checked Sep 30, 2026
22	Omni Powertrain Technologies	Strong evidence	Houston, TX, United StatesHQ checked Sep 30, 2026	501-1,000	59 contacts →
	Strong evidence “We design, develop and manufacture world class power transmission systems for global OEMs, providing our customers with innovative performance, quality and value, that meets or…” Source: RevenueBase Database · checked Sep 30, 2026
23	Chardam Gear Company	Partial evidence	Sterling Heights, MI, United StatesHQ checked Sep 30, 2026	51-200	59 contacts →
	Partial evidence “If you have requirements for high performance gears (spur, helical or spiral bevel), splined shaft, housings, details or complete gearboxes, Chardam Gear Company can fulfill your…” Source: RevenueBase Database · checked Sep 30, 2026
24	GAM Enterprises, LLC	Indirect evidence	Mount Prospect, IL, United StatesHQ checked Sep 30, 2026	11-50	59 contacts →
	Indirect evidence “GAM, a U.S.” Source: RevenueBase Database · checked Sep 30, 2026
25	Riley Gear Corporation	Partial evidence	Saint Augustine, United StatesHQ checked Sep 30, 2026	51-200	57 contacts →
	Partial evidence “Riley Gear Corporation develops and produces precision gears, custom gear boxes, and other power transmission components.” Source: RevenueBase Database · checked Sep 30, 2026

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: custom gearbox manufacturers. 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 custom gearbox manufacturers.
Partial evidence: Its own public description names part of custom gearbox manufacturers, so it works in or next to the category without describing itself that way.
Indirect evidence: The description shown does not name custom gearbox manufacturers. 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 248 custom gearbox manufacturers based in the United States

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Custom gearbox manufacturers based in the United States at a glance

As of Sep 30, 2026

38.3%Verified-email coverage

26.7Average contacts per company

11-50Median size (employees)

1.6%Largest-city concentration · Cleveland

Sep 30, 2026Page data refreshed

Companies by employee count

1-10

11-50

104

51-200

201-500

501-1,000

1,001-5,000

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 248 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 custom gearbox manufacturers, 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 “custom gearbox manufacturers”. 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 custom gearbox manufacturers), 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 custom gearbox manufacturers, 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, 2,531 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 30, 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 custom gearbox manufacturers, 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 custom gearbox manufacturers are there based in the United States?

RevenueBase identified 248 custom gearbox manufacturers 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?

Gleason Corporation, headquartered in Rochester, tops this list with the largest team on record.

Which city has the most custom gearbox manufacturers?

Cleveland leads with 4 headquartered companies, followed by Houston (4) and Madison Heights (4).

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 2,531 verified decision-maker contacts tracked across these 248 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 30, 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.