2022 NAICS national industry in sector 31-33 Manufacturing
332811 Metal Heat Treating
NAICS 332811 is the US industry code for metal heat treating. This U.S.
- Code
- 332811 (2022 NAICS)
- Title
- Metal Heat Treating
- Part of
- Coating, Engraving, Heat Treating, and Allied Activities
- SBA small business limit
- Up to 750 employees
- Closest UK SIC
- 25920 (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 heat treating, such as annealing, tempering, and brazing, and cryogenically treating metals and metal products for the trade.
When to use a different code
Census classifies these close-sounding activities somewhere else. Businesses mainly engaged in:
- Establishments primarily engaged in both fabricating and heat treating metal products are classified in the Manufacturing sector according to the product made.
Activities listed under 332811
The Census index assigns these 9 activities to this code. If your business matches one, this is your code.
- Annealing metals and metal products for the trade
- Brazing (i.e., hardening) metals and metal products for the trade
- Burning metals and metal products for the trade
- Cold treating metals for the trade
- Cryogenic treating metals for the trade
- Hardening (i.e., heat treating) metals and metal products for the trade
- Heat treating metals and metal products for the trade
- Shot peening metal and metal products for the trade
- Tempering metals and metal products for the trade
SBA size standard for 332811
To count as a small business for SBA loans and federal contracts under NAICS 332811, your business (including affiliates) must not exceed 750 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: 2592), so treat them as a starting point and check the definition.
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.