331313 — Alumina Refining and Primary Aluminum Production
Description
This U.S. industry comprises establishments primarily engaged in one or more of the following: (1) refining alumina (i.e., aluminum oxide) generally from bauxite; (2) making aluminum from alumina; and/or (3) making aluminum from alumina and rolling, drawing, extruding, or casting the aluminum they make into primary forms. Establishments in this industry may make primary aluminum or aluminum-based alloys from alumina.
Overview Facts
| NAICS Code | 331313 |
|---|---|
| Industry Title | Alumina Refining and Primary Aluminum Production |
| SBA Size Standard | 1,300 employees |
| IRS PBA Code | 331310 (rolled-up match) |
| Sectors Hierarchy | Sector 31-33 → 331 → 3313 |
| Source / Verified | US Census 2022 NAICS Manual / 2026-06-28 |
Legacy SIC Concordance
Trace the historical mapping chain from the 1987 Standard Industrial Classification (SIC) to the modern 2022 NAICS code format.
- SIC 2819 - Industrial Inorganic Chemicals, NEC (via SIC1987:2819→NAICS1997:331311→2002:331311→2007:331311→2012:331313→2017:331313→2022:331313)
- SIC 3334 - Primary Production of Aluminum (via SIC1987:3334→NAICS1997:331312→2002:331312→2007:331312→2012:331313→2017:331313→2022:331313)
Related Resources & Compliance Guides
Further regulatory reference links for NAICS code 331313:
- 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.
- 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.
Related Industries in 3313
Frequently Asked Questions (FAQ)
Is 331313 a valid 2022 NAICS code?
NAICS 331313 is 'Alumina Refining and Primary Aluminum Production', a 2022 U.S. national industry under Sector 31-33 (Manufacturing); the SBA small-business size standard is 1,300 employees.
What is the SBA size standard for NAICS 331313?
The SBA small business size standard for NAICS 331313 is 1,300 employees (based on employees).
What is the legacy SIC code mapping for 331313?
NAICS code 331313 maps to the legacy 1987 SIC codes: 2819 - Industrial Inorganic Chemicals, NEC, 3334 - Primary Production of Aluminum.