NAICS 339991

Overview

The North American Industry Classification System (NAICS) is the federal standard for grouping business establishments so agencies can collect, analyze, and publish statistics about the U.S. economy. Developed under the Office of Management and Budget (OMB) with the U.S. ECPC, Statistics Canada, and Mexico’s INEGI, NAICS enables comparability across North America. The current vintage is 2022. ¹

NAICS 339991 — Gasket, Packing, and Sealing Device Manufacturing — comprises establishments primarily engaged in manufacturing gaskets, packings, and sealing devices of all materials. Federal statistical programs and economic releases (e.g., the Economic Census) use this code to categorize output and establishments producing these sealing products. ²

See also on G2X:

• NAICS 339991 — overview
• NAICS 326291 — Rubber Product Manufacturing for Mechanical Use
• PSC 5330 — Packing and Gasket Materials

What this NAICS covers

• Gasket manufacturing for industrial and commercial applications, of all materials. ²
• Packing manufacturing used to seal mechanical interfaces (e.g., stems, shafts, flanges). ²
• Sealing device manufacturing, including devices intended to prevent fluid or gas leakage. ²
• Carbon or graphite gaskets are classified in this industry. ²
• Leather gaskets are classified in this industry. ²
• Rubber gaskets, packing, and sealing devices are classified in this industry (distinct from broader rubber-goods categories). ²

Related NAICS and PSC codes

Key inclusions and exclusions (per NAICS cross-references)

• Carbon/graphite gaskets are included in 339991 (not under carbon/graphite products). ²
• Rubber gaskets, packing, and sealing devices fall under 339991, not under broader rubber-product categories such as 326291 or 326299. ²
• Leather gaskets are included in 339991. ²
• Hoses and belting are classified in 326220; sealing devices remain in 339991. ²

Frequently asked questions

• What does NAICS 339991 cover?

  • It covers establishments primarily engaged in manufacturing gaskets, packing, and sealing devices of all materials. This is a manufacturing classification used in federal statistics to identify producers of sealing products across materials. ²

• How is NAICS 339991 different from NAICS 326291?

  • 326291 captures rubber products for mechanical use in general, while 339991 specifically covers gaskets, packings, and sealing devices (including those made of rubber). Cross-references direct rubber sealing devices to 339991. ²

• Are carbon/graphite gaskets in NAICS 335991 or NAICS 339991?

  • Carbon or graphite gaskets are classified in 339991; the carbon and graphite products industry 335991 cross-references these gaskets to 339991. ⁸

• Does NAICS 339991 include leather or metal gaskets?

  • Yes. The industry is defined to include gaskets, packing, and sealing devices “of all materials,” and leather gaskets are specifically referenced to this industry in NAICS materials. ²

• Which PSCs commonly align with gaskets and packings?

  • Product Service Codes frequently used for these items include 5330 (Packing and Gasket Materials) and 5331 (O-Ring) in federal procurement reporting. See also on G2X: PSC 5330 and PSC 5331. ⁴

Useful resources

• U.S. Census Bureau — NAICS main page and search (includes the NAICS introduction and 2022 vintage). ¹
• U.S. Census Bureau — NAICS Manual (2017) industry definitions and cross-references. ³
• GSA — Product and Service Code (PSC) Manual (April 2025). ⁴
• U.S. Census Bureau — 2022 Economic Census, Manufacturing (NAICS 31–33) data access. ⁵

References

1. U.S. Census Bureau. North American Industry Classification System (NAICS) — main page. https://www.census.gov/naics/
2. U.S. Census Bureau. NAICS 2022 Search — 339991 Gasket, Packing, and Sealing Device Manufacturing. https://www.census.gov/naics/?input=339991&year=2022
3. U.S. Census Bureau. North American Industry Classification System: United States, 2017 (NAICS Manual). https://www2.census.gov/library/reference/naics/publications/2017-NAICS-Manual.pdf
4. U.S. General Services Administration. Product and Service Codes (PSC) Manual, April 2025. https://login.acquisition.gov/sites/default/files/manual/PSC%20Manual%20April%202025.pdf
5. U.S. Census Bureau. 2022 Economic Census — Manufacturing (NAICS 31–33). https://www.census.gov/data/tables/2022/econ/economic-census/naics-sector-31-33.html
6. U.S. Census Bureau. NAICS 2022 Search — 326291 Rubber Product Manufacturing for Mechanical Use. https://www.census.gov/naics/?input=326291&year=2022
7. U.S. Census Bureau. NAICS 2022 Search — 326220 Rubber and Plastics Hoses and Belting Manufacturing. https://www.census.gov/naics/?input=326220&year=2022
8. U.S. Census Bureau. NAICS 2022 Search — 335991 Carbon and Graphite Product Manufacturing. https://www.census.gov/naics/?input=335991&year=2022