NAICS Code 332811 — Metal Heat Treating

National Industry in the official 2022 North American Industry Classification System (U.S. Census Bureau). It is one of 3 national industries under 33281 (Coating, Engraving, Heat Treating, and Allied Activities).

Code	332811
Title	Metal Heat Treating
Level	National Industry (6-digit)
Edition	NAICS 2022 edition
SBA size standard	750 employees

Official definition (2022 NAICS)

This U.S. industry comprises establishments primarily engaged in heat treating, such as annealing, tempering, and brazing, and cryogenically treating metals and metal products for the trade.

Cross-References.

Is a business under 332811 "small"?

Under the SBA size standards (13 CFR 121.201, effective March 17, 2023), a business classified in NAICS 332811 qualifies as a small business if it does not exceed 750 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 332811 sits in the hierarchy

Level	Code	Title
Sector	31-33	Manufacturing
Subsector	332	Fabricated Metal Product Manufacturing
Industry Group	3328	Coating, Engraving, Heat Treating, and Allied Activities
NAICS Industry	33281	Coating, Engraving, Heat Treating, and Allied Activities
National Industry	332811	Metal Heat Treating

Related SIC codes

Via the official U.S. Census concordance (1987 SIC ↔ NAICS), shown only where the industry definition is unchanged in NAICS 2022.

SIC code	Title
3398	Metal Heat Treating

Related National Industry codes

• 332812 — Metal Coating, Engraving (except Jewelry and Silverware), and Allied Services to Manufacturers
• 332813 — Electroplating, Plating, Polishing, Anodizing, and Coloring

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.