NAICS 333612 Quarterly Industry Report
Speed Changer, Industrial High-Speed Drive, and Gear Manufacturing
Comprehensive industry research for valuation professionals, business owners, buyers, and lenders
NAICS Code: 333612Sector: 33Updated: Q1 2026
About This Report
This Fair Market Value industry report covers NAICS 333612 (Speed Changer, Industrial High-Speed Drive, and Gear Manufacturing) using the 2022 North American Industry Classification System. Data sources include the U.S. Census Bureau[4] NAICS classification, Bureau of Labor Statistics[5] manufacturing employment data, and SBA size standard tables. Content addresses industry structure, product scope, and market dynamics for establishments primarily engaged in manufacturing mechanical power transmission components.
Industry Snapshot
Key metrics for the speed changer, industrial high-speed drive, and gear manufacturing industry.
Industry Definition & Overview
Speed Changer, Industrial High-Speed Drive, and Gear Manufacturing (NAICS 333612) encompasses establishments primarily engaged in manufacturing gears, speed changers, and industrial high-speed drives (except hydrostatic). Products include worm gears, bevel gears, spur gears, helical gears, gear drives, speed reducers, speed increasers, parallel shaft drives, and right-angle drives for industrial power transmission applications. Per the Census Bureau[4], this classification covers mechanical power transmission components that transfer rotational motion between shafts at specified speed ratios and torque levels.
Manufacturing processes require specialized gear cutting, grinding, and heat treatment capabilities. Gear production uses hobbing machines, shaping machines, and profile grinding equipment to achieve tooth geometry within AGMA (American Gear Manufacturers Association) quality class specifications. Heat treating processes including carburizing, nitriding, and induction hardening develop required surface hardness and core toughness. Assembly operations integrate precision bearings, seals, lubrication systems, and housings into complete drive units. Workforce needs include gear engineers, CNC machine operators, metallurgists, and quality inspectors who verify gear tooth accuracy using coordinate measurement systems.
Geographic distribution follows general machinery manufacturing patterns. Facilities concentrate in the industrial Midwest with additional operations in the Southeast and Mid-Atlantic regions. According to BLS data[5], manufacturing employment distributes across states with established precision machining infrastructure. Customer markets span mining, oil and gas, power generation, food processing, and material handling industries requiring reliable mechanical power transmission at specified speed and torque ratings.
What's Included in This Industry
- Speed reducers and gear reduction units
- Speed increasers and multiplier drives
- Worm gear drives and worm reducers
- Helical, bevel, and spur gear sets
- Parallel shaft gear drives
- Right-angle gear drives
- Industrial high-speed drives and couplings
- Gear motors and combined gear-motor units
- Custom gearbox design and manufacturing
- Gear repair and rebuilding services
NAICS Classification Hierarchy
| Level | Description | Code |
|---|---|---|
| Subsector | Machinery Manufacturing | 333 |
| Industry Group | Engine, Turbine, and Power Transmission Equipment Manufacturing | 3336 |
| NAICS Industry | Engine, Turbine, and Power Transmission Equipment Manufacturing | 33361 |
| National Industry | Speed Changer, Industrial High-Speed Drive, and Gear Manufacturing | 333612 |
Related NAICS Codes
| Code | Description | Relationship |
|---|---|---|
| 333611 | Turbine and Turbine Generator Set Units Manufacturing | Manufactures turbine and turbine generator sets that depend on gearboxes and speed changers from NAICS 333612 producers for matching turbine output speeds to generator requirements |
| 333613 | Mechanical Power Transmission Equipment Manufacturing | Produces mechanical power transmission equipment including bearings, couplings, and clutches that complement gears and speed changers in complete power transmission system installations |
| 333618 | Other Engine Equipment Manufacturing | Manufactures other engine equipment sharing rotating machinery expertise and power conversion engineering knowledge with gear and speed changer producers in the same industry group |
| 333517 | Machine Tool Manufacturing | Produces machine tools including gear cutting and grinding machines that gear manufacturers use to produce gear teeth at specified AGMA quality classes |
| 332991 | Ball and Roller Bearing Manufacturing | Manufactures ball and roller bearings that integrate into gearbox assemblies as precision rotating element support components essential for gear drive operation and service life |
| 333132 | Oil and Gas Field Machinery and Equipment Manufacturing | Manufactures oil and gas field machinery that requires heavy-duty gearboxes and speed reducers from NAICS 333612 producers for drawworks, mud pumps, and rotary table drive systems |
Geographic Concentration
Top states by share of national establishments.
| # | State | % Est. | Total Est. |
|---|---|---|---|
| 1 | Illinois | 15.3% | 28 |
| 2 | Ohio | 9.3% | 17 |
| 3 | Michigan | 8.7% | 16 |
| 4 | Wisconsin | 6.6% | 12 |
| 5 | New York | 6.6% | 12 |
| 6 | Pennsylvania | 5.5% | 10 |
| 7 | Texas | 5.5% | 10 |
| 8 | California | 4.9% | 9 |
| 9 | Missouri | 4.9% | 9 |
| 10 | Minnesota | 4.4% | 8 |
% Of Establishments
0%
15%
Source: County Business Patterns, U.S. Census Bureau[3]
Frequently Asked Questions
Common questions about this industry.
What types of businesses are classified under NAICS 333612?
NAICS 333612 classifies establishments primarily engaged in manufacturing gears, speed changers, and industrial drives for mechanical power transmission. Products include gear reducers, speed increasers, worm drives, and high-speed drives. The Census Bureau[4] distinguishes this from bearings and couplings (NAICS 333613) and hydrostatic drives (NAICS 333996).
How is the gear and speed changer manufacturing industry structured?
Large manufacturers produce standard product lines of enclosed gear drives distributed through industrial supply channels and OEM partnerships. Mid-size firms specialize in specific applications such as mining gearboxes, wind turbine drives, or precision instrument gears. Smaller manufacturers build custom gearboxes, produce replacement gear sets, and provide gear repair and rebuilding services for existing installations.
What is the SBA size standard for gear and speed changer manufacturers?
The SBA sets the size standard at 500 employees for NAICS 333612. Firms at or below this threshold qualify as small businesses for federal contracting preferences and SBA lending programs. Details appear in the SBA size standards table[6].
What NAICS codes are closely related to gear manufacturing?
NAICS 333613 covers bearings and couplings complementing gear drives. NAICS 333611 covers turbines requiring gearboxes. Many 333618 covers other engine equipment. These adjacent codes reflect the integrated power transmission equipment supply chain where gears, bearings, and couplings work together.
What industries depend on gear and speed changer manufacturers?
Mining operations purchase heavy-duty gear drives for conveyors, crushers, and mills. Wind energy companies invest in turbine gearboxes. Per BLS data[5], industrial manufacturing employment across multiple sectors depends on mechanical power transmission equipment from NAICS 333612 producers.
What activities does NAICS 333612 include?
Covered products include speed reducers, speed increasers, worm drives, helical gear sets, bevel gears, parallel shaft drives, right-angle drives, gear motors, and custom gearboxes. Manufacturing activities span gear cutting, hobbing, grinding, heat treatment, and assembly. Excluded items include hydrostatic drives (NAICS 333996), bearings (NAICS 333613), and automotive transmissions (NAICS 336350).
Are gear and speed changer manufacturers eligible for SBA loans?
Yes, manufacturers meeting the 500-employee threshold qualify for SBA 7(a) loans, 504 loans, and federal contracting set-asides. The SBA funding programs[9] page details eligibility for manufacturing businesses seeking capital for gear cutting equipment, heat treating furnaces, and working capital.
Where is gear and speed changer manufacturing concentrated in the United States?
Wisconsin, Ohio, and Pennsylvania host notable concentrations of gear manufacturers, positioned near industrial machinery customers and steel supply chains. Additional facilities operate in Indiana and Illinois. According to BLS employment data[5], power transmission equipment manufacturing employment clusters in Midwest states with established precision machining and heat treating infrastructure.
Sources & References
Government datasets and editorial sources used in this report.
- [1]U.S. Bureau of Labor Statistics, Quarterly Census of Employment and Wages bls.gov
- [2]U.S. Census Bureau, Economic Census census.gov
- [3]U.S. Census Bureau, County Business Patterns census.gov
- [4]Census Bureau census.gov
- [5]BLS data bls.gov
- [6]Small Business Administration sba.gov
- [7]SBA 7(a) loans sba.gov
- [8]504 loans sba.gov
- [9]SBA funding programs sba.gov
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