NAICS Code 331313 — Alumina Refining and Primary Aluminum Production

National Industry in the official 2022 North American Industry Classification System (U.S. Census Bureau). It is one of 4 national industries under 33131 (Alumina and Aluminum Production and Processing).

Code	331313
Title	Alumina Refining and Primary Aluminum Production
Level	National Industry (6-digit)
Edition	NAICS 2022 edition
SBA size standard	1,300 employees

Official definition (2022 NAICS)

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.

Is a business under 331313 "small"?

Under the SBA size standards (13 CFR 121.201, effective March 17, 2023), a business classified in NAICS 331313 qualifies as a small business if it does not exceed 1,300 employees. Small-business status determines eligibility for federal set-aside contracts, SAM.gov certifications and SBA loan programs — employee count is averaged over the latest 24 months.

Where 331313 sits in the hierarchy

Level	Code	Title
Sector	31-33	Manufacturing
Subsector	331	Primary Metal Manufacturing
Industry Group	3313	Alumina and Aluminum Production and Processing
NAICS Industry	33131	Alumina and Aluminum Production and Processing
National Industry	331313	Alumina Refining and Primary Aluminum Production

No direct SIC mapping is shown for this code: it was introduced or redefined after the official 1987 SIC ↔ 2002 NAICS concordance. Use the crosswalk tool to explore related legacy codes.

Related National Industry codes

• 331314 — Secondary Smelting and Alloying of Aluminum
• 331315 — Aluminum Sheet, Plate, and Foil Manufacturing
• 331318 — Other Aluminum Rolling, Drawing, and Extruding

Data: official 2022 NAICS structure, descriptions and Census concordances, U.S. Census Bureau — U.S. government works in the public domain (17 U.S.C. §105). Suggested reference, not an official determination.