335991 — Carbon and Graphite Product Manufacturing
Description
This U.S. industry comprises establishments primarily engaged in manufacturing carbon, graphite, and metal-graphite brushes and brush stock; carbon or graphite electrodes for thermal and electrolytic uses; carbon and graphite fibers; and other carbon, graphite, and metal-graphite products (as defined in the official U.S. Census Bureau 2022 NAICS Manual).
Exclusions & Cross-References
- Establishments primarily engaged in manufacturing carbon or graphite gaskets are classified in U.S. Industry
- 339991, Gasket, Packing, and Sealing Device Manufacturing.
Overview Facts
Legacy SIC Concordance
Trace the historical mapping chain from the 1987 Standard Industrial Classification (SIC) to the modern 2022 NAICS code format.
- SIC 3624 - Carbon and Graphite Products (via SIC1987:3624→NAICS1997:335991→2002:335991→2007:335991→2012:335991→2017:335991→2022:335991)
Suggested Product Service Codes (Advisory)
The following Product Service Codes (PSCs) are advisory suggestions aligned with this NAICS code. Note: NAICS and PSC codes map to different dimensions of procurement (industry vs. product/service). There is no official binding 1:1 crosswalk.
- PSC 9530 — Bars and Rods, Nonferrous Base Metal
Source: DoD DPCAP PSC Selection Tool (Ingested: 2026-06-29)
Frequently Asked Questions (FAQ)
Is NAICS code 335991 valid in 2022? ▾
Yes, 335991 is a valid 6-digit 2022 NAICS national industry code representing 'Carbon and Graphite Product Manufacturing' under Sector 31-33 in the official classification index.
What is the SBA size standard for NAICS code 335991? ▾
The Small Business Administration (SBA) has established a small business size standard of 900 employees for NAICS code 335991 (Carbon and Graphite Product Manufacturing), calculated based on employees.
What is the legacy SIC equivalent for NAICS 335991? ▾
According to official Census Bureau concordance tables, NAICS code 335991 (Carbon and Graphite Product Manufacturing) maps to legacy 1987 Standard Industrial Classification (SIC) codes: 3624 - Carbon and Graphite Products.
Related Pages & Tools
Further regulatory reference links for NAICS code 335991:
- Sector 31-33 Directory Hub — List of related industries in the Manufacturing sector.
- SIC ↔ NAICS Crosswalk Tool — Look up mappings between legacy SIC codes and modern classifications.
- NAICS 335991 to SIC Crosswalk — Bidirectional mapping to legacy SIC codes (Carbon and Graphite Product Manufacturing).
- SBA Size Standards Guide — Complete rules and averaging periods for small business classifications.
- Calculating Annual Receipts Guide — Detailed worked example of revenue calculation rules.
- IRS Principal Business Activity Guide — How NAICS codes map to corporate and entity tax filings.