NAICS 333613 Quarterly Industry Report
Mechanical Power Transmission Equipment Manufacturing
Comprehensive industry research for valuation professionals, business owners, buyers, and lenders
NAICS Code: 333613Sector: 33Updated: Q1 2026
About This Report
This Fair Market Value industry report covers NAICS 333613 (Mechanical Power Transmission Equipment Manufacturing) using the 2022 North American Industry Classification System. Data sources include the U.S. Census Bureau[5] NAICS classification, Bureau of Labor Statistics[6] manufacturing employment data, and SBA size standard tables. Content addresses industry structure, product scope, and market dynamics for establishments primarily engaged in manufacturing bearings, couplings, and related power transmission components.
Industry Snapshot
Key metrics for the mechanical power transmission equipment manufacturing industry.
Industry Definition & Overview
Mechanical Power Transmission Equipment Manufacturing (NAICS 333613) encompasses establishments primarily engaged in manufacturing mechanical power transmission equipment other than gears, speed changers, and industrial high-speed drives. Products include plain bearings, clutches (except motor vehicle and electromagnetic), couplings, drive chains, joints, pulleys, sprockets, and drive shafts for industrial applications. Per the Census Bureau[5], this classification covers mechanical components that connect, disconnect, and transfer rotational power between rotating machinery elements.
Manufacturing processes vary widely across product categories. Bearing producers require precision turning, grinding, and superfinishing capabilities to achieve surface finish specifications measured in microinches. Coupling manufacturers combine machining, casting, and elastomer processing to produce flexible and rigid shaft connections. Chain drive producers integrate precision stamping, heat treating, and assembly operations. Quality standards including ISO, ABMA, and AGMA specifications govern dimensional accuracy, material properties, and performance testing. Workforce requirements include metallurgists, precision machinists, assembly technicians, and application engineers who select appropriate components for customer installations.
Geographic distribution follows industrial machinery manufacturing patterns. Facilities concentrate in the Midwest, Southeast, and Mid-Atlantic regions near industrial customers. According to BLS data[6], manufacturing employment distributes across states with established precision engineering and metalworking infrastructure. Customer markets span mining, agriculture, food processing, material handling, and general industrial manufacturing where mechanical power transmission connects prime movers to driven equipment across virtually every production process.
What's Included in This Industry
- Plain bearings and bushings for industrial applications
- Clutches (except motor vehicle and electromagnetic)
- Rigid and flexible shaft couplings
- Universal joints and constant velocity joints
- Drive chains and sprocket assemblies
- V-belt and synchronous belt pulleys and sheaves
- Industrial drive shafts and propeller shafts
- Torque limiters and overload protection devices
- Power transmission component kits and assemblies
- Custom power transmission design and engineering
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 | Mechanical Power Transmission Equipment Manufacturing | 333613 |
Related NAICS Codes
| Code | Description | Relationship |
|---|---|---|
| 333612 | Speed Changer, Industrial High-Speed Drive, and Gear Manufacturing | Manufactures gears, speed changers, and industrial drives that work alongside bearings, couplings, and clutches in complete mechanical power transmission assemblies for industrial equipment |
| 333611 | Turbine and Turbine Generator Set Units Manufacturing | Produces turbine and generator sets requiring bearings, couplings, and drive shafts from NAICS 333613 manufacturers as essential rotating element support and connection components |
| 333618 | Other Engine Equipment Manufacturing | Manufactures other engine equipment sharing rotating machinery expertise and power conversion engineering knowledge within the same engine and power transmission equipment industry group |
| 332991 | Ball and Roller Bearing Manufacturing | Produces ball and roller bearings as a separate classification from the plain bearings and bushings manufactured under NAICS 333613, serving similar applications with different bearing technologies |
| 333922 | Conveyor and Conveying Equipment Manufacturing | Manufactures conveyors and conveying equipment that integrate chains, sprockets, couplings, and bearings from NAICS 333613 as essential drive train and material transport components |
| 333995 | Fluid Power Cylinder and Actuator Manufacturing | Produces fluid power cylinders and actuators sharing industrial component manufacturing capabilities and OEM customer relationships with mechanical power transmission equipment producers |
Geographic Concentration
Top states by share of national establishments.
| # | State | % Est. | Total Est. |
|---|---|---|---|
| 1 | Texas | 9.8% | 20 |
| 2 | Ohio | 9.8% | 20 |
| 3 | Wisconsin | 8.8% | 18 |
| 4 | Illinois | 7.3% | 15 |
| 5 | New York | 6.9% | 14 |
| 6 | Indiana | 6.4% | 13 |
| 7 | Michigan | 5.9% | 12 |
| 8 | California | 5.4% | 11 |
| 9 | Connecticut | 4.4% | 9 |
| 10 | Pennsylvania | 4.4% | 9 |
% Of Establishments
0%
10%
Source: County Business Patterns, U.S. Census Bureau[3]
SBA Lending Summary
32
Total SBA Loans
$6.7M
Total Loan Volume
$209K
Average Loan Size
10 yrs
Average Loan Term
11.19%
Average Interest Rate
112
Jobs Supported
Source: SBA 7(a) Program Data, U.S. Small Business Administration — FY 2025[4]
Key Insight: The Small Business Administration[7] sets the size standard for NAICS 333613 at 750 employees. Firms averaging 750 or fewer employees over the preceding 12 months qualify as small businesses for SBA loan programs, federal contracting set-asides, and small business certifications. This threshold applies to establishments where mechanical power transmission equipment production represents the primary business activity. Eligible businesses can access SBA 7(a) loans[8] for working capital, equipment, and acquisition financing, while 504 loans[9] support major fixed-asset purchases including real estate and heavy machinery.
Top SBA Lenders
| # | Lender | Loans | Volume | Avg Loan |
|---|---|---|---|---|
| 1 | Cadence Bank | 8 | $4.0M | $500K |
| 2 | Northeast Bank | 16 | $2.3M | $143K |
| 3 | Readycap Lending, LLC | 8 | $400K | $50K |
Frequently Asked Questions
Common questions about this industry.
What types of businesses are classified under NAICS 333613?
NAICS 333613 classifies establishments primarily engaged in manufacturing mechanical power transmission components including plain bearings, clutches, couplings, drive chains, pulleys, and drive shafts. The Census Bureau[5] distinguishes this from gears and speed changers (NAICS 333612) and ball and roller bearings (NAICS 332991).
How is the power transmission equipment manufacturing industry structured?
Large manufacturers produce broad product lines of bearings, couplings, and chain drives distributed through industrial supply networks. Mid-size firms specialize in specific product categories such as precision couplings, mining chains, or agricultural drive components. Smaller manufacturers build custom power transmission solutions and provide component reconditioning services for existing industrial equipment.
What is the SBA size standard for power transmission equipment manufacturers?
The SBA sets the size standard at 750 employees for NAICS 333613. 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[7].
What NAICS codes are closely related to power transmission equipment manufacturing?
NAICS 333612 covers gears and speed changers in the same industry group. NAICS 332991 covers ball and roller bearings serving similar applications. Market 333611 covers turbines requiring power transmission components. These adjacent codes reflect the interconnected rotating equipment supply chain.
What industries depend on power transmission equipment manufacturers?
Mining operations purchase heavy-duty chains, couplings, and bearings for conveyor and crusher drives. Agricultural equipment manufacturers integrate belt drives, chain drives, and clutches into harvesting machinery. Per BLS data[6], industrial manufacturing employment spans sectors that depend on mechanical power transmission components from NAICS 333613 producers.
What activities does NAICS 333613 include?
Covered products include plain bearings, industrial clutches, shaft couplings, universal joints, drive chains, sprockets, pulleys, and drive shafts. Manufacturing activities span precision machining, stamping, heat treating, and component assembly. Excluded items include gears and speed changers (NAICS 333612), ball bearings (NAICS 332991), and motor vehicle clutches (NAICS 336350).
Are power transmission equipment manufacturers eligible for SBA loans?
Yes, manufacturers meeting the 750-employee threshold qualify for SBA 7(a) loans, 504 loans, and federal contracting set-asides. The SBA funding programs[10] page details eligibility for manufacturing businesses seeking capital for precision machining equipment, heat treating facilities, and working capital.
Where is power transmission equipment manufacturing concentrated in the United States?
Ohio, Indiana, and Michigan host notable concentrations of power transmission component manufacturers positioned near industrial machinery customers and automotive supply chains. Additional facilities operate in Wisconsin, Illinois, and the Southeast. According to BLS employment data[6], power transmission equipment manufacturing employment clusters in states with established industrial machinery and metalworking 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]U.S. Small Business Administration, SBA 7(a) Loan Program Data data.sba.gov
- [5]Census Bureau census.gov
- [6]BLS data bls.gov
- [7]Small Business Administration sba.gov
- [8]SBA 7(a) loans sba.gov
- [9]504 loans sba.gov
- [10]SBA funding programs sba.gov
Disclaimer
This publication has been prepared by Fair Market Value (“Fair Market Value”) for informational purposes only. It is provided on an “as-is” and “as available” basis. Fair Market Value makes no representations or warranties, express or implied, regarding the merchantability, fitness for a particular purpose, completeness, or accuracy of the data or information contained herein. This publication is not intended to be, and should not be construed as, professional financial, legal, tax, or investment advice. Users should consult with qualified professionals before making any financial or business decisions based on the information presented.
To the extent permitted by law, Fair Market Value disclaims all liability for loss or damage, direct and indirect, suffered or incurred by any person resulting from the use of, or reliance upon, the data in this publication.
Copyright © 2026 Fair Market Value. All rights reserved. All data, information, articles, graphs, and content contained in this publication are copyrighted works and Fair Market Value hereby reserves all rights. No part of this publication may be copied, reproduced, republished, uploaded to a third party, or distributed without the prior written permission of Fair Market Value.