2022 NAICS national industry in sector 31-33 Manufacturing
335312 Motor and Generator Manufacturing
NAICS 335312 is the US industry code for motor and generator manufacturing. This U.S.
- Code
- 335312 (2022 NAICS)
- Title
- Motor and Generator Manufacturing
- Part of
- Electrical Equipment Manufacturing
- SBA small business limit
- Up to 1,250 employees
- Closest UK SIC
- 27110, 27120 (details)
Changes coming. The NAICS 2027 revision applies to data from 1 January 2027, and SBA proposed new size standards on 20 August 2026. The values on this page are the ones in force today; we update this page when the official files change.
Official definition
This U.S. industry comprises establishments primarily engaged in manufacturing electric motors (except internal combustion engine starting motors), power generators (except battery charging alternators for internal combustion engines), and motor generator sets (except turbine generator set units). This industry includes establishments rewinding armatures on a factory basis.
When to use a different code
Census classifies these close-sounding activities somewhere else. Businesses mainly engaged in:
- Manufacturing electric outboard motors are classified in U.S. Industry 333618, Other Engine Equipment Manufacturing.
- Manufacturing gas, steam, or hydraulic turbine generator set units are classified in U.S. Industry 333611, Turbine and Turbine Generator Set Units Manufacturing.
- Manufacturing starting motors and battery charging alternators for internal combustion engines are classified in Industry 336320, Motor Vehicle Electrical and Electronic Equipment Manufacturing.
- Rewinding armatures, not on a factory basis are classified in Industry 811310, Commercial and Industrial Machinery and Equipment (except Automotive and Electronic) Repair and Maintenance.
- Manufacturing welding and soldering equipment (except handheld soldering irons) are classified in U.S. Industry 333992, Welding and Soldering Equipment Manufacturing.
Activities listed under 335312
The Census index assigns these 38 activities to this code. If your business matches one, this is your code.
- Armature rewinding on a factory basis
- Armatures, industrial, manufacturing
- Coils for motors and generators manufacturing
- Collector rings for motors and generators manufacturing
- Commutators, electric motor, manufacturing
- Condensers, synchronous, electric, manufacturing
- Converters, phase and rotary, electrical equipment, manufacturing
- Dynamos, electric (except automotive), manufacturing
- Dynamotors manufacturing
- Exciter assemblies, motor and generator, manufacturing
- Fractional horsepower electric motors manufacturing
- Frequency converters (i.e., electric generators) manufacturing
- Generating apparatus and parts, electrical (except internal combustion engine and welding), manufacturing
- Generator sets, prime mover (except turbine generator sets), manufacturing
- Generators and sets, electric (except internal combustion engine, welding, turbine generator sets), manufacturing
- Generators for gas-electric and oil-electric vehicles, manufacturing
- Generators for storage battery chargers (except internal combustion engine and aircraft) manufacturing
- Ground Power Units (GPU) manufacturing
- Integral horsepower electric motors manufacturing
- Inverters, rotating electrical, manufacturing
- Land transportation motors and generators manufacturing
- Motor generator sets (except automotive, turbine generator sets) manufacturing
- Motors, electric (except engine starting motors, gearmotors, outboard), manufacturing
- Phase converters (i.e., electrical equipment) manufacturing
- Power generators manufacturing
- Prime mover generator sets (except turbine generator sets) manufacturing
- Railway motors and control equipment, electric, manufacturing
- Resolvers manufacturing
- Rotor retainers and housings manufacturing
- Rotors (i.e., for motors) manufacturing
- Servomotors manufacturing
- Slip rings for motors and generators manufacturing
- Stators for motors manufacturing
- Storage battery chargers (except internal combustion engine-type) manufacturing
- Synchronous condensers and timing motors, electric, manufacturing
- Synchronous motors manufacturing
- Timing motors, synchronous, electric, manufacturing
- Torque motors, electric, manufacturing
SBA size standard for 335312
To count as a small business for SBA loans and federal contracts under NAICS 335312, your business (including affiliates) must not exceed 1,250 employees. Check your business.
Source: SBA table of size standards, effective March 17, 2023.
Closest UK SIC 2007 codes
There is no official one-to-one link between NAICS and UK SIC. These codes share the same international class (ISIC Rev. 4: 2710), so treat them as a starting point and check the definition.
- 27110Manufacture of electric motors, generators and transformersUK SIC
- 27120Manufacture of electricity distribution and control apparatusUK SIC
Built from Census concordances 2022→2017 NAICS and 2017 NAICS→ISIC Rev. 4.
Similar codes to compare
Data last changed November 14, 2026. How this page is built.