2022 NAICS national industry in sector 31-33 Manufacturing

331313 Alumina Refining and Primary Aluminum Production

NAICS 331313 is the US industry code for alumina refining and primary aluminum production. This U.S.

Code: 331313 (2022 NAICS)
Title: Alumina Refining and Primary Aluminum Production
Part of: Alumina and Aluminum Production and Processing
SBA small business limit: Up to 1,300 employees
Closest UK SIC: 24200 (details)

Changes coming. The NAICS 2027 revision applies to data from 1 January 2027, and SBA proposed new size standards on 20 August 2026. The values on this page are the ones in force today; we update this page when the official files change.

Official definition

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.

Cross-references. Establishments primarily engaged in--

Source: US Census Bureau, 2022 NAICS descriptions.

When to use a different code

Census classifies these close-sounding activities somewhere else. Businesses mainly engaged in:

Manufacturing aluminum oxide abrasives and refractories are classified in Subsector 327, Nonmetallic Mineral Product Manufacturing.
Recovering aluminum from scrap or alloying purchased aluminum are classified in U.S. Industry 331314, Secondary Smelting and Alloying of Aluminum.

Source: US Census Bureau, 2022 NAICS cross-references.

Activities listed under 331313

The Census index assigns these 14 activities to this code. If your business matches one, this is your code.

Alumina refining
Aluminum alloys made from bauxite or alumina producing primary aluminum and manufacturing
Aluminum ingot and other primary aluminum production shapes made from bauxite or alumina
Aluminum oxide refining
Aluminum producing from alumina
Aluminum shapes (e.g., bar, ingot, rod, sheet) made by producing primary aluminum and manufacturing
Extrusion ingot, primary aluminum, manufacturing
Ingot, primary aluminum, manufacturing
Primary aluminum production and manufacturing aluminum alloys
Primary aluminum production and manufacturing aluminum shapes (e.g., bar, ingot, rod, sheet)
Primary refining of aluminum
Primary smelting of aluminum
Refining aluminum, primary
Slab, primary aluminum, manufacturing

Source: US Census Bureau, 2022 NAICS index file.

SBA size standard for 331313

To count as a small business for SBA loans and federal contracts under NAICS 331313, your business (including affiliates) must not exceed 1,300 employees. Check your business.

Source: SBA table of size standards, effective March 17, 2023.

Closest UK SIC 2007 codes

There is no official one-to-one link between NAICS and UK SIC. These codes share the same international class (ISIC Rev. 4: 2420), so treat them as a starting point and check the definition.

24200Manufacture of tubes, pipes, hollow profiles and related fittings, of steelUK SIC

Built from Census concordances 2022→2017 NAICS and 2017 NAICS→ISIC Rev. 4.

Similar codes to compare

Data last changed November 14, 2026. How this page is built.