Analysis
NAICS 335312 is the 2022 national industry for motor and generator manufacturing, part of 33531 (Electrical Equipment Manufacturing). Census lists 38 example activities under it in the official index.
County Business Patterns counts 398 US establishments in this code in 2023, employing 29,856 people at an average annual payroll of $78,062 per employee (66th percentile of national industries). 30% of the establishments have fewer than five employees, which is close to the national mix.
Census lists 5 related activities that belong elsewhere, most often in 333618, 333611, 336320 and 811310. Businesses that do several things are classified by their primary activity, the one that generates the most value, so check those boundaries before settling on this code.
Its index entries, the activities Census uses to assign businesses to this code, include armature rewinding on a factory basis, armatures, industrial, manufacturing, coils for motors and generators manufacturing and collector rings for motors and generators manufacturing, among 38 in all.
Its goods appear in 87 statistical lines of the US tariff schedule, mostly under headings 8501 (electric motors and generators (excluding generating sets)), 8503 () and 8502 (electric generating sets and rotary converters). That link is how import data is matched to domestic producers, for example in trade-remedy cases.
For example, manufacturing electric outboard motors are classified in 333618 (Other Engine Equipment Manufacturing) instead.
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.
Source: US Census Bureau, NAICS 2022 Manual.
Not this code if…
| The business mainly does | Use instead |
|---|---|
| Manufacturing electric outboard motors | 333618 Other Engine Equipment Manufacturing |
| Manufacturing gas, steam, or hydraulic turbine generator set units | 333611 Turbine and Turbine Generator Set Units Manufacturing |
| Manufacturing starting motors and battery charging alternators for internal combustion engines | 336320 Motor Vehicle Electrical and Electronic Equipment Manufacturing |
| Rewinding armatures, not on a factory basis | 811310 Commercial and Industrial Machinery and Equipment (except Automotive and Electronic) Repair and Maintenance |
| Manufacturing welding and soldering equipment (except handheld soldering irons) | 333992 Welding and Soldering Equipment Manufacturing |
Index entries (38)
- 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