SIC 5051 to NAICS Code Crosswalk
The legacy 1987 SIC code 5051 (Metals Service Centers and Offices) maps transitively to modern U.S. Census 2022 NAICS code(s): 423510, 425120.
Concordance Concordance Mapping Asset
| Source Code | Source Industry | Target Code | Target Industry | Relation | Concordance Path |
|---|---|---|---|---|---|
| SIC 5051 | Metals Service Centers and Offices | NAICS 423510 | Metal Service Centers and Other Metal Merchant Wholesalers | One-to-Many | SIC1987:5051 → NAICS1997:42151 → 2002:423510 → 2007:423510 → 2012:423510 → 2017:423510 → 2022:423510 |
| SIC 5051 | Metals Service Centers and Offices | NAICS 425120 | Wholesale Trade Agents and Brokers | One-to-Many | SIC1987:5051 → NAICS1997:42151 → 2002:425120 → 2007:425120 → 2012:425120 → 2017:425120 → 2022:425120 |
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 423510 to SIC, NAICS 425120 to SIC.
Related Pages & Tools
- SIC Code 5051 Profile — Legacy OSHA definition and associated industrial metadata.
- SIC Major Group 50 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.