NAICS 331420 to SIC Code Crosswalk
The NAICS code 331420 (Copper Rolling, Drawing, Extruding, and Alloying) maps transitively to legacy 1987 SIC classification code(s): 3341, 3351, 3357, 3399.
Concordance Concordance Mapping Asset
| Source Code | Source Industry | Target Code | Target Industry | Relation | Concordance Path |
|---|---|---|---|---|---|
| NAICS 331420 | Copper Rolling, Drawing, Extruding, and Alloying | SIC 3341 | Secondary Smelting and Refining of Nonferrous Metals | Many-to-Many | SIC1987:3341 → NAICS1997:331423 → 2002:331423 → 2007:331423 → 2012:331420 → 2017:331420 → 2022:331420 |
| NAICS 331420 | Copper Rolling, Drawing, Extruding, and Alloying | SIC 3351 | Rolling, Drawing, and Extruding of Copper | Many-to-Many | SIC1987:3351 → NAICS1997:331421 → 2002:331421 → 2007:331421 → 2012:331420 → 2017:331420 → 2022:331420 |
| NAICS 331420 | Copper Rolling, Drawing, Extruding, and Alloying | SIC 3357 | Drawing and Insulating of Nonferrous Wire | Many-to-Many | SIC1987:3357 → NAICS1997:331422 → 2002:331422 → 2007:331422 → 2012:331420 → 2017:331420 → 2022:331420 |
| NAICS 331420 | Copper Rolling, Drawing, Extruding, and Alloying | SIC 3399 | Primary Metal Products, NEC | Many-to-Many | SIC1987:3399 → NAICS1997:331423 → 2002:331423 → 2007:331423 → 2012:331420 → 2017:331420 → 2022:331420 |
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 3341 to NAICS, SIC 3351 to NAICS, SIC 3357 to NAICS, SIC 3399 to NAICS.
Related Pages & Tools
- NAICS Code 331420 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.