NAICS 339991 Quarterly Industry Report
Gasket, Packing, and Sealing Device Manufacturing
Comprehensive industry research for valuation professionals, business owners, buyers, and lenders
NAICS Code: 339991Sector: 33Updated: Q1 2026
About This Report
Fair Market Value publishes this NAICS 339991 industry profile drawing on data from the U.S. Census Bureau's Annual Survey of Manufactures[8], Bureau of Labor Statistics employment data[6], and SBA size standard tables[7]. Our research team reviews industrial production indices and trade data to verify sealing product demand patterns. This report receives quarterly updates reflecting manufacturing output trends, raw material pricing, and workforce changes in the gasket and seal manufacturing sector.
Industry Snapshot
Key metrics for the gasket, packing, and sealing device manufacturing industry.
Industry Definition & Overview
Gasket, Packing, and Sealing Device Manufacturing (NAICS 339991) encompasses establishments primarily engaged in manufacturing gaskets, packing, and sealing devices of all materials. Products include sheet gaskets, molded gaskets, metallic gaskets, compression packing, mechanical seals, O-rings, oil seals, and custom-engineered sealing solutions for industrial, automotive, and aerospace applications. The U.S. Census Bureau[5] classifies this industry within miscellaneous manufacturing.
Production methods depend on material type and application requirements. Rubber and elastomer seals require mixing, molding, and curing processes. Metal gaskets involve stamping, laser cutting, and surface finishing operations. Composite gasket manufacturing combines fiber, rubber, and metal layers through lamination and die-cutting. PTFE and specialty polymer seals demand precise machining and temperature-controlled molding. Quality control testing for pressure ratings, chemical resistance, and temperature tolerance is critical across all product categories. Short production runs of custom-engineered seals coexist with high-volume commodity O-ring production. The Bureau of Labor Statistics[6] tracks employment in this miscellaneous manufacturing subsector.
Under SBA size standards[7], NAICS 339991 carries a threshold of 500 employees. Demand correlates with industrial production activity, automotive manufacturing volumes, and oil and gas sector capital spending. Aftermarket replacement parts generate recurring revenue independent of new equipment production cycles. Specialty aerospace and nuclear sealing products command premium pricing due to stringent certification requirements. Raw material costs for specialty rubber compounds, fluoropolymers, and high-alloy metals directly influence production margins for manufacturers serving demanding technical applications.
What's Included in This Industry
- Sheet and molded gasket manufacturing
- Metallic and spiral wound gasket production
- Compression packing manufacturing for valve and pump applications
- Mechanical seal fabrication for rotating equipment
- O-ring production in rubber, silicone, and fluoropolymer materials
- Oil seal and shaft seal manufacturing
- PTFE and specialty polymer seal production
- Custom-engineered sealing solution design and fabrication
- Gasket material sheet and roll production
- Expansion joint and bellows manufacturing
NAICS Classification Hierarchy
| Level | Description | Code |
|---|---|---|
| Subsector | Miscellaneous Manufacturing | 339 |
| Industry Group | Other Miscellaneous Manufacturing | 3399 |
| NAICS Industry | All Other Miscellaneous Manufacturing | 33999 |
| National Industry | Gasket, Packing, and Sealing Device Manufacturing | 339991 |
Related NAICS Codes
| Code | Description | Relationship |
|---|---|---|
| 339999 | All Other Miscellaneous Manufacturing | All other miscellaneous manufacturing shares the same subsector classification and similar small-batch industrial component production characteristics |
| 339993 | Fastener, Button, Needle, and Pin Manufacturing | Fastener, button, needle, and pin manufacturing shares the miscellaneous manufacturing classification and similar precision metal forming production methods |
| 326291 | Rubber Product Manufacturing for Mechanical Use | Rubber product manufacturing for mechanical use shares elastomer compounding and molding processes with gasket and seal production operations |
| 332919 | Other Metal Valve and Pipe Fitting Manufacturing | Other metal valve and pipe fitting manufacturing uses gaskets and seals as essential components in assembled valve and piping products |
| 333914 | Measuring, Dispensing, and Other Pumping Equipment Manufacturing | Measuring, dispensing, and other pumping equipment manufacturing consumes mechanical seals and packing as critical pump assembly components |
| 336390 | Other Motor Vehicle Parts Manufacturing | Other motor vehicle parts manufacturing represents a major end market consuming gaskets, oil seals, and sealing components for automotive applications |
Geographic Concentration
Top states by share of national establishments.
| # | State | % Est. | Total Est. |
|---|---|---|---|
| 1 | Texas | 11.3% | 70 |
| 2 | California | 9.9% | 61 |
| 3 | Ohio | 7.6% | 47 |
| 4 | Illinois | 6.6% | 41 |
| 5 | Pennsylvania | 5.7% | 35 |
| 6 | New York | 4.5% | 28 |
| 7 | Florida | 3.9% | 24 |
| 8 | New Jersey | 3.7% | 23 |
| 9 | Indiana | 3.7% | 23 |
| 10 | Oklahoma | 3.4% | 21 |
% Of Establishments
0%
11%
Source: County Business Patterns, U.S. Census Bureau[3]
SBA Lending Summary
88
Total SBA Loans
$156.1M
Total Loan Volume
$1.8M
Average Loan Size
10 yrs
Average Loan Term
8.88%
Average Interest Rate
2,208
Jobs Supported
Source: SBA 7(a) Program Data, U.S. Small Business Administration — FY 2025[4]
Key Insight: The SBA[7] assigns NAICS 339991 a size standard of 500 employees. Many gasket and seal manufacturers operate as mid-sized specialty producers serving specific industrial sectors. Qualifying firms access 7(a) loans for CNC equipment, rubber molding presses, and quality testing apparatus. The 504 loan program supports facility acquisition for manufacturers expanding cleanroom production or adding material testing laboratory capabilities.
Top SBA Lenders
| # | Lender | Loans | Volume | Avg Loan |
|---|---|---|---|---|
| 1 | Webster Bank National Association | 16 | $80.0M | $5.0M |
| 2 | St. Charles Bank & Trust Company, National Association | 8 | $38.4M | $4.8M |
| 3 | Newtek Bank, National Association | 8 | $13.6M | $1.7M |
| 4 | Citizens Bank | 8 | $8.3M | $1.0M |
| 5 | City National Bank | 16 | $7.5M | $470K |
Frequently Asked Questions
Common questions about this industry.
What types of businesses are classified under NAICS 339991?
NAICS 339991 covers manufacturers of gaskets, packing, and sealing devices made from all materials. Products include sheet gaskets, molded gaskets, metallic gaskets, compression packing, mechanical seals, O-rings, oil seals, and custom-engineered sealing solutions. The U.S. Census Bureau[5] classifies these producers within miscellaneous manufacturing.
How is gasket and sealing device manufacturing structured?
Manufacturers range from high-volume O-ring producers running automated molding lines to specialty shops fabricating custom-engineered seals for aerospace and nuclear applications. Production methods include rubber molding, metal stamping, laser cutting, lamination, and precision machining. Many firms specialize in specific materials or end markets rather than producing across all sealing product categories.
What is the SBA size standard for NAICS 339991?
The SBA sets the size standard at 500 employees for gasket, packing, and sealing device manufacturing. Most firms in this industry operate below that threshold. The SBA size standard table[7] applies this employee count for small business certification, federal contracting preferences, and SBA lending eligibility.
What NAICS codes are related to gasket and sealing device manufacturing?
Related manufacturing codes include 339999 (all other miscellaneous manufacturing), 339993 (fastener manufacturing), and 326291 (rubber product manufacturing). End-market codes include 332919 (valve and pipe fittings), 333914 (pump equipment), and 336390 (motor vehicle parts). The Census Bureau[5] places this industry within miscellaneous manufacturing.
What industries are closely related to gasket and sealing device manufacturing?
Rubber product manufacturers (326291) share molding processes. Valve makers (332919) and pump manufacturers (333914) consume seals as components. Automotive parts producers (336390) represent a major end market. Industrial supply wholesalers (423840) distribute finished products to maintenance and repair operations across multiple sectors.
What activities are included in NAICS 339991?
Covered activities include sheet and molded gasket production, metallic gasket fabrication, compression packing manufacturing, mechanical seal assembly, O-ring molding, oil seal production, PTFE seal machining, custom seal engineering, gasket material sheet production, and expansion joint manufacturing. The Census Bureau[5] covers all sealing device manufacturing from any material.
Can gasket and sealing device manufacturers qualify for SBA loans?
Yes, manufacturers with 500 or fewer employees qualify as small businesses under SBA guidelines[7]. The 7(a) loan program supports rubber molding press purchases, CNC equipment, and quality testing laboratory buildouts. Market 504 program covers facility acquisition and expansion. Defense and aerospace seal manufacturers may also access federal contracting set-asides.
Where is gasket and sealing device manufacturing concentrated in the United States?
Production clusters near industrial manufacturing hubs and automotive production centers. Ohio, Michigan, Texas, and Pennsylvania host notable concentrations of gasket and seal producers. Proximity to heavy industrial and automotive OEM customers drives plant location patterns. The Census Bureau's County Business Patterns[9] tracks establishment counts by state for this industry code.
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]SBA size standards sba.gov
- [8]U.S. Census Bureau's Annual Survey of Manufactures census.gov
- [9]Census Bureau's County Business Patterns census.gov
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