NAICS 333994 to SIC Code Crosswalk
The NAICS code 333994 (Industrial Process Furnace and Oven Manufacturing) maps transitively to legacy 1987 SIC classification code(s): 2599, 3567, 3821, 3841.
Concordance Concordance Mapping Asset
| Source Code | Source Industry | Target Code | Target Industry | Relation | Concordance Path |
|---|---|---|---|---|---|
| NAICS 333994 | Industrial Process Furnace and Oven Manufacturing | SIC 2599 | Furniture and Fixtures, NEC | Many-to-Many | SIC1987:2599 → NAICS1997:339111 → 2002:339111 → 2007:333994 → 2012:333994 → 2017:333994 → 2022:333994 |
| NAICS 333994 | Industrial Process Furnace and Oven Manufacturing | SIC 3567 | Industrial Process Furnaces and Ovens | Many-to-Many | SIC1987:3567 → NAICS1997:333994 → 2002:333994 → 2007:333994 → 2012:333994 → 2017:333994 → 2022:333994 |
| NAICS 333994 | Industrial Process Furnace and Oven Manufacturing | SIC 3821 | Laboratory Apparatus and Furniture | Many-to-Many | SIC1987:3821 → NAICS1997:339111 → 2002:339111 → 2007:333994 → 2012:333994 → 2017:333994 → 2022:333994 |
| NAICS 333994 | Industrial Process Furnace and Oven Manufacturing | SIC 3841 | Surgical and Medical Instruments and Apparatus | Many-to-Many | SIC1987:3841 → NAICS1997:339111 → 2002:339111 → 2007:333994 → 2012:333994 → 2017:333994 → 2022:333994 |
Why Concordances Don't Line Up 1:1
The Standard Industrial Classification (SIC) system was established in 1937 and last updated in 1987, organizing businesses by end products. The North American Industry Classification System (NAICS) replaced it in 1997, classifying establishments by production processes. Because of this structural shift, many-to-many relationships are common, requiring chained concordance steps to bridge the historical gap.
Reverse Crosswalk: Going the other way? See the mapping at SIC 2599 to NAICS, SIC 3567 to NAICS, SIC 3821 to NAICS, SIC 3841 to NAICS.
Related Pages & Tools
- NAICS Code 333994 Profile — Official definition, SBA size standards, and establishment statistics.
- Sector 31-33 Hub (Manufacturing) — Category directories.
- Interactive Crosswalk Engine — Convert any SIC or NAICS code dynamically.
Primary Ingestion Source
Data sourced from the U.S. Census Bureau Concordances (1997, 2002, 2007, 2012, 2017, and 2022 editions). Last verified on 2026-06-30.