SIC 3399 to NAICS Code Crosswalk
The legacy 1987 SIC code 3399 (Primary Metal Products, NEC) maps transitively to modern U.S. Census 2022 NAICS code(s): 331221, 331314, 331420, 331492, 332618, 332813.
Concordance Concordance Mapping Asset
| Source Code | Source Industry | Target Code | Target Industry | Relation | Concordance Path |
|---|---|---|---|---|---|
| SIC 3399 | Primary Metal Products, NEC | NAICS 331221 | Rolled Steel Shape Manufacturing | One-to-Many | SIC1987:3399 → NAICS1997:331221 → 2002:331221 → 2007:331221 → 2012:331221 → 2017:331221 → 2022:331221 |
| SIC 3399 | Primary Metal Products, NEC | NAICS 331314 | Secondary Smelting and Alloying of Aluminum | One-to-Many | SIC1987:3399 → NAICS1997:331314 → 2002:331314 → 2007:331314 → 2012:331314 → 2017:331314 → 2022:331314 |
| SIC 3399 | Primary Metal Products, NEC | NAICS 331420 | Copper Rolling, Drawing, Extruding, and Alloying | One-to-Many | SIC1987:3399 → NAICS1997:331423 → 2002:331423 → 2007:331423 → 2012:331420 → 2017:331420 → 2022:331420 |
| SIC 3399 | Primary Metal Products, NEC | NAICS 331492 | Secondary Smelting, Refining, and Alloying of Nonferrous Metal (except Copper and Aluminum) | One-to-Many | SIC1987:3399 → NAICS1997:331492 → 2002:331492 → 2007:331492 → 2012:331492 → 2017:331492 → 2022:331492 |
| SIC 3399 | Primary Metal Products, NEC | NAICS 332618 | Other Fabricated Wire Product Manufacturing | One-to-Many | SIC1987:3399 → NAICS1997:332618 → 2002:332618 → 2007:332618 → 2012:332618 → 2017:332618 → 2022:332618 |
| SIC 3399 | Primary Metal Products, NEC | NAICS 332813 | Electroplating, Plating, Polishing, Anodizing, and Coloring | One-to-Many | SIC1987:3399 → NAICS1997:332813 → 2002:332813 → 2007:332813 → 2012:332813 → 2017:332813 → 2022:332813 |
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 NAICS 331221 to SIC, NAICS 331314 to SIC, NAICS 331420 to SIC, NAICS 331492 to SIC, NAICS 332618 to SIC, NAICS 332813 to SIC.
Related Pages & Tools
- SIC Code 3399 Profile — Legacy OSHA definition and associated industrial metadata.
- SIC Major Group 33 Hub — Legacy category group directory.
- 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.