NAICS 336390 Quarterly Industry Report
Other Motor Vehicle Parts Manufacturing
Comprehensive industry research for valuation professionals, business owners, buyers, and lenders
NAICS Code: 336390Sector: 33Updated: Q1 2026
About This Report
This Fair Market Value industry report for NAICS 336390 draws on verified data from the U.S. Census Bureau[5], Bureau of Labor Statistics[6], and the Small Business Administration[7]. Our research team compiles establishment counts, employment data, and SBA eligibility criteria specific to other motor vehicle parts manufacturing. Reports are updated quarterly to reflect new Census releases and regulatory changes.
Industry Snapshot
Key metrics for the other motor vehicle parts manufacturing industry.
Industry Definition & Overview
Other Motor Vehicle Parts Manufacturing (NAICS 336390) encompasses establishments primarily engaged in manufacturing motor vehicle parts and accessories not classified in other specific motor vehicle parts categories. Products include exhaust systems, catalytic converters, mufflers, air filters, oil filters, wheels and rims, mirrors, windshield wiper systems, seat belts and restraint systems, airbag modules, fuel tanks, radiators, and a broad range of hardware, fasteners, and subassemblies used in vehicle construction. The U.S. Census Bureau[5] classifies this residual category under motor vehicle parts manufacturing.
Roughly 2,380 active businesses employ an estimated 164,000 workers in this industry, making it the largest NAICS code by employment within the motor vehicle parts sector. The breadth of this classification produces extreme diversity in firm size, technology, and end markets. Large Tier 1 suppliers produce complex safety systems like airbag modules and seat belt pretensioners, while thousands of smaller firms manufacture brackets, gaskets, hose assemblies, and hardware components as Tier 2 and Tier 3 suppliers in the automotive supply chain.
Manufacturing processes range from tube bending and welding for exhaust systems, to clean-room assembly for airbag inflators, to aluminum casting and machining for wheels, to filter media pleating and assembly for air and oil filters. Emissions control components including catalytic converters require precious metal catalyst coatings (platinum, palladium, rhodium) that represent a major cost factor. Aftermarket replacement parts generate substantial revenue for exhaust, filter, mirror, and wiper manufacturers whose products are consumed as wear or maintenance items. FMVSS standards govern safety-critical products including airbags, seat belts, and fuel system integrity, while EPA Tier 3 emissions standards drive catalytic converter design specifications.
What's Included in This Industry
- Exhaust system and muffler manufacturing
- Catalytic converter production
- Air and oil filter manufacturing for vehicles
- Wheel and rim production
- Rearview and side mirror manufacturing
- Airbag module and inflator production
- Seat belt and restraint system manufacturing
- Fuel tank manufacturing
- Radiator and cooling system production
- Windshield wiper system manufacturing
NAICS Classification Hierarchy
| Level | Description | Code |
|---|---|---|
| Subsector | Transportation Equipment Manufacturing | 336 |
| Industry Group | Motor Vehicle Parts Manufacturing | 3363 |
| NAICS Industry | Other Motor Vehicle Parts Manufacturing | 33639 |
| National Industry | Other Motor Vehicle Parts Manufacturing | 336390 |
Related NAICS Codes
| Code | Description | Relationship |
|---|---|---|
| 336370 | Motor Vehicle Metal Stamping | Manufactures motor vehicle metal stampings including body panels and structural components classified under a dedicated stamping code rather than the miscellaneous parts produced here |
| 336310 | Motor Vehicle Gasoline Engine and Engine Parts Manufacturing | Produces gasoline engines and engine-specific parts classified under a dedicated engine manufacturing code rather than the exhaust, filtration, and accessory parts produced here |
| 336340 | Motor Vehicle Brake System Manufacturing | Manufactures motor vehicle brake systems classified under a dedicated brake code rather than the other vehicle parts and accessories manufactured in this residual classification |
| 336320 | Motor Vehicle Electrical and Electronic Equipment Manufacturing | Produces motor vehicle electrical equipment classified under a dedicated electronics code rather than the mechanical parts and accessory components manufactured here |
| 336330 | Motor Vehicle Steering and Suspension Components (except Spring) Manufacturing | Manufactures steering and suspension components classified under a dedicated chassis parts code rather than the miscellaneous vehicle parts and accessories produced here |
| 336350 | Motor Vehicle Transmission and Power Train Parts Manufacturing | Produces transmission and drive train components classified under a dedicated powertrain code rather than the diverse vehicle accessories and parts manufactured in this category |
Geographic Concentration
Top states by share of national establishments.
| # | State | % Est. | Total Est. |
|---|---|---|---|
| 1 | Michigan | 12.7% | 167 |
| 2 | California | 11.6% | 152 |
| 3 | Texas | 6.9% | 91 |
| 4 | Ohio | 6.4% | 84 |
| 5 | Indiana | 6.1% | 80 |
| 6 | Illinois | 3.8% | 50 |
| 7 | Alabama | 3.6% | 47 |
| 8 | Florida | 3.4% | 44 |
| 9 | Georgia | 3.3% | 43 |
| 10 | Tennessee | 3.2% | 42 |
% Of Establishments
0%
13%
Source: County Business Patterns, U.S. Census Bureau[3]
SBA Lending Summary
136
Total SBA Loans
$118.3M
Total Loan Volume
$870K
Average Loan Size
9 yrs
Average Loan Term
10.03%
Average Interest Rate
2,504
Jobs Supported
Source: SBA 7(a) Program Data, U.S. Small Business Administration — FY 2025[4]
Key Insight: The SBA[7] sets the size standard for NAICS 336390 at 750 employees. Firms below this threshold qualify for small business set-aside contracts and SBA-backed lending programs. Federal procurement includes filters for government fleet vehicles, exhaust components for military vehicles, and safety restraint parts for defense vehicle programs. The SBA's contracting programs[8] support parts manufacturers pursuing DLA, GSA fleet, and Army TACOM vehicle component contracts. Eligible businesses can access SBA 7(a) loans[9] for working capital, equipment, and acquisition financing, while 504 loans[10] support major fixed-asset purchases including real estate and heavy machinery.
Top SBA Lenders
| # | Lender | Loans | Volume | Avg Loan |
|---|---|---|---|---|
| 1 | Newtek Bank, National Association | 8 | $28.0M | $3.5M |
| 2 | Five Star Bank | 8 | $24.0M | $3.0M |
| 3 | Brookline Bank, a Division of Beacon Bank and Trust | 16 | $21.6M | $1.4M |
| 4 | American Riviera Bank | 8 | $14.4M | $1.8M |
| 5 | Manufacturers and Traders Trust Company | 16 | $14.0M | $875K |
Frequently Asked Questions
Common questions about this industry.
What types of businesses are classified under NAICS 336390?
Manufacturers of motor vehicle parts not classified in other dedicated categories belong here. Products include exhaust systems, catalytic converters, filters, wheels, mirrors, airbags, seat belts, fuel tanks, radiators, and wiper systems per the Census Bureau[5] classification.
How is the other motor vehicle parts industry structured?
Roughly 2,380 businesses employ an estimated 164,000 workers per Census data[11]. This is the largest motor vehicle parts classification by employment, ranging from global Tier 1 airbag and restraint system producers to small machine shops producing brackets and subassemblies as Tier 3 suppliers.
What is the SBA size standard for NAICS 336390?
The SBA[7] sets the threshold at 750 employees. Businesses with fewer than 750 average employees qualify as small for federal contracting preferences and SBA-backed financing programs including 7(a) and 504 loans.
What NAICS codes are related to other motor vehicle parts?
Related codes include 336370 (Metal Stampings), 336310 (Engines), 336340 (Brakes), 336320 (Vehicle Electrical), 336330 (Steering and Suspension), and 336350 (Transmissions). Each covers a specific motor vehicle parts category with its own dedicated NAICS code rather than falling into this residual classification.
What industries purchase other motor vehicle parts?
Automobile assemblers, parts wholesalers, repair shops, nonferrous foundries, and heavy truck manufacturers interact most directly. Both OEM production supply and aftermarket replacement create demand, with filters, exhaust components, and wiper blades generating recurring maintenance-driven revenue.
What activities are included in NAICS 336390?
Activities include bending and welding exhaust systems, coating catalytic converter substrates with precious metal catalysts, pleating and assembling air and oil filters, casting and machining aluminum wheels, assembling airbag modules with inflators and fabric cushions, manufacturing seat belt webbing and pretensioner mechanisms, and producing fuel tanks, radiators, and wiper assemblies.
Can other motor vehicle parts manufacturers qualify for SBA loans?
Yes, firms below 750 employees qualify for SBA lending programs[8] including 7(a) and 504 loans. CNC tube benders, filter assembly lines, aluminum casting equipment, airbag deployment test chambers, and welding robots represent capital investments suited to SBA 504 equipment financing.
Where are other motor vehicle parts manufacturers concentrated?
Production concentrates in the Midwest automotive corridor including Michigan, Ohio, Indiana, and Illinois, with additional clusters in Tennessee, Alabama, South Carolina, and Texas near vehicle assembly plants. The extreme diversity of products in this classification means manufacturers locate based on their specific product's supply chain requirements and customer proximity needs. Aftermarket parts producers distribute more broadly near population centers and auto parts distribution hubs.
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]U.S. Census Bureau census.gov
- [6]Bureau of Labor Statistics bls.gov
- [7]Small Business Administration sba.gov
- [8]SBA's contracting programs sba.gov
- [9]SBA 7(a) loans sba.gov
- [10]504 loans sba.gov
- [11]Census data naicslist.com
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