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 (as defined in the official U.S. Census Bureau 2022 NAICS Manual).
Overview Facts
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)
Suggested Product Service Codes (Advisory)
The following Product Service Codes (PSCs) are advisory suggestions aligned with this NAICS code. Note: NAICS and PSC codes map to different dimensions of procurement (industry vs. product/service). There is no official binding 1:1 crosswalk.
- PSC 9630 — Additive Metal Materials
Source: DoD DPCAP PSC Selection Tool (Ingested: 2026-06-29)
Frequently Asked Questions (FAQ)
Is NAICS code 331313 valid in 2022? ▾
Yes, 331313 is a valid 6-digit 2022 NAICS national industry code representing 'Alumina Refining and Primary Aluminum Production' under Sector 31-33 in the official classification index.
What is the SBA size standard for NAICS code 331313? ▾
The Small Business Administration (SBA) has established a small business size standard of 1,300 employees for NAICS code 331313 (Alumina Refining and Primary Aluminum Production), calculated based on employees.
What is the legacy SIC equivalent for NAICS 331313? ▾
According to official Census Bureau concordance tables, NAICS code 331313 (Alumina Refining and Primary Aluminum Production) maps to legacy 1987 Standard Industrial Classification (SIC) codes: 2819 - Industrial Inorganic Chemicals, NEC, 3334 - Primary Production of Aluminum.
Related Pages & Tools
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.
- NAICS 331313 to SIC Crosswalk — Bidirectional mapping to legacy SIC codes (Alumina Refining and Primary Aluminum Production).
- 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.