2022 NAICS national industry in sector 31-33 Manufacturing
333613 Mechanical Power Transmission Equipment Manufacturing
NAICS 333613 is the US industry code for mechanical power transmission equipment manufacturing. This U.S.
- Code
- 333613 (2022 NAICS)
- Title
- Mechanical Power Transmission Equipment Manufacturing
- Part of
- Engine, Turbine, and Power Transmission Equipment Manufacturing
- SBA small business limit
- Up to 750 employees
- Closest UK SIC
- 28140 (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 mechanical power transmission equipment (except motor vehicle and aircraft), such as plain bearings, clutches (except motor vehicle and electromagnetic industrial control), couplings, joints, and drive chains.
When to use a different code
Census classifies these close-sounding activities somewhere else. Businesses mainly engaged in:
- Manufacturing motor vehicle power transmission equipment are classified in Industry 336350, Motor Vehicle Transmission and Power Train Parts Manufacturing.
- Manufacturing aircraft power transmission equipment are classified in U.S. Industry 336413, Other Aircraft Parts and Auxiliary Equipment Manufacturing.
- Manufacturing ball and roller bearings are classified in U.S. Industry 332991, Ball and Roller Bearing Manufacturing.
- Manufacturing gears, speed changers, and industrial high-speed drives (except hydrostatic) are classified in U.S. Industry 333612, Speed Changer, Industrial High-Speed Drive, and Gear Manufacturing.
Activities listed under 333613
The Census index assigns these 14 activities to this code. If your business matches one, this is your code.
- Ball joints (except aircraft, motor vehicle) manufacturing
- Bearings, plain (except internal combustion engine), manufacturing
- Bushings, plain (except internal combustion engine), manufacturing
- Chains, power transmission, manufacturing
- Collars, shaft for power transmission equipment, manufacturing
- Couplings, mechanical power transmission, manufacturing
- Drive chains, bicycle and motorcycle, manufacturing
- Joints, swivel (except aircraft, motor vehicle), manufacturing
- Joints, universal (except aircraft, motor vehicle), manufacturing
- Pulleys, power transmission, manufacturing
- Railroad car journal bearings, plain, manufacturing
- Sheaves, mechanical power transmission, manufacturing
- Sprockets, power transmission equipment, manufacturing
- Universal joints (except aircraft, motor vehicle) manufacturing
SBA size standard for 333613
To count as a small business for SBA loans and federal contracts under NAICS 333613, your business (including affiliates) must not exceed 750 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: 2814), so treat them as a starting point and check the definition.
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.